renamed back to testing-modules, pulled together testing-modules-2 modules into single module

testing-modules/junit-5/README.md

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+### Relevant Articles:
+- [A Guide to @RepeatedTest in Junit 5](http://www.baeldung.com/junit-5-repeated-test)
+- [Guide to Dynamic Tests in Junit 5](http://www.baeldung.com/junit5-dynamic-tests)
+- [A Guide to JUnit 5 Extensions](http://www.baeldung.com/junit-5-extensions)
+- [Inject Parameters into JUnit Jupiter Unit Tests](http://www.baeldung.com/junit-5-parameters)
+- [Mockito and JUnit 5 – Using ExtendWith](http://www.baeldung.com/mockito-junit-5-extension)
+- [JUnit5 Programmatic Extension Registration with @RegisterExtension](http://www.baeldung.com/junit-5-registerextension-annotation)
+- [The Order of Tests in JUnit](http://www.baeldung.com/junit-5-test-order)
+- [Running JUnit Tests Programmatically, from a Java Application](https://www.baeldung.com/junit-tests-run-programmatically-from-java)
+- [Testing an Abstract Class With JUnit](https://www.baeldung.com/junit-test-abstract-class)
+- [A Quick JUnit vs TestNG Comparison](http://www.baeldung.com/junit-vs-testng)
+- [Guide to JUnit 5 Parameterized Tests](https://www.baeldung.com/parameterized-tests-junit-5)
+- [JUnit 5 Conditional Test Execution with Annotations](https://www.baeldung.com/junit-5-conditional-test-execution)
+- [Assertions in JUnit 4 and JUnit 5](http://www.baeldung.com/junit-assertions)

testing-modules/junit-5/pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <!-- NOT NEEDED - JSP <groupId>com.baeldung</groupId> -->
+    <artifactId>junit-5</artifactId>
+    <version>1.0-SNAPSHOT</version>
+    <name>junit-5</name>
+    <description>Intro to JUnit 5</description>
+
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>parent-modules</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
+        <relativePath>../../</relativePath>
+    </parent>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.junit.platform</groupId>
+            <artifactId>junit-platform-engine</artifactId>
+            <version>${junit.platform.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter-engine</artifactId>
+            <version>${junit.jupiter.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter-params</artifactId>
+            <version>${junit.jupiter.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter-api</artifactId>
+            <version>${junit.jupiter.version}</version>
+        </dependency>    
+        <dependency>
+            <groupId>org.junit.platform</groupId>
+            <artifactId>junit-platform-runner</artifactId>
+            <version>${junit.platform.version}</version>
+            <scope>test</scope>
+        </dependency>
+         <dependency>
+            <groupId>org.junit.vintage</groupId>
+            <artifactId>junit-vintage-engine</artifactId>
+            <version>${junit.vintage.version}</version>
+            <scope>test</scope>
+        </dependency>
+         <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter-migrationsupport</artifactId>
+            <version>${junit.vintage.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.logging.log4j</groupId>
+            <artifactId>log4j-core</artifactId>
+            <version>${log4j2.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>com.h2database</groupId>
+            <artifactId>h2</artifactId>
+            <version>${h2.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework</groupId>
+            <artifactId>spring-test</artifactId>
+            <version>${spring.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework</groupId>
+            <artifactId>spring-context</artifactId>
+            <version>${spring.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.powermock</groupId>
+            <artifactId>powermock-module-junit4</artifactId>
+            <version>${powermock.version}</version>
+            <scope>test</scope>
+            <exclusions>
+                <exclusion>
+                    <groupId>junit</groupId>
+                    <artifactId>junit</artifactId>
+                </exclusion>
+            </exclusions>
+        </dependency>
+        <dependency>
+            <groupId>org.mockito</groupId>
+            <artifactId>mockito-junit-jupiter</artifactId>
+            <version>${mockito.junit.jupiter.version}</version>
+            <scope>test</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>org.powermock</groupId>
+            <artifactId>powermock-api-mockito2</artifactId>
+            <version>${powermock.version}</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <resources>
+            <resource>
+                <directory>src/test/resources</directory>
+                <filtering>true</filtering>
+            </resource>
+        </resources>
+        <plugins>
+            <plugin>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <version>${maven-surefire-plugin.version}</version>
+            </plugin>
+            <plugin>
+                <groupId>org.codehaus.mojo</groupId>
+                <artifactId>exec-maven-plugin</artifactId>
+                <version>${exec-maven-plugin.version}</version>
+                <executions>
+                    <execution>
+                        <goals>
+                            <goal>java</goal>
+                        </goals>
+                    </execution>
+                </executions>
+                <configuration>
+                    <mainClass>com.baeldung.TestLauncher</mainClass>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+
+    <properties>
+        <junit.jupiter.version>5.4.2</junit.jupiter.version>
+        <mockito.junit.jupiter.version>2.23.0</mockito.junit.jupiter.version>
+        <junit.platform.version>1.4.2</junit.platform.version>
+        <junit.vintage.version>5.4.2</junit.vintage.version>
+        <log4j2.version>2.8.2</log4j2.version>
+        <powermock.version>2.0.0-RC.1</powermock.version>
+        <maven-surefire-plugin.version>2.22.0</maven-surefire-plugin.version>
+        <exec-maven-plugin.version>1.6.0</exec-maven-plugin.version>
+        <spring.version>5.0.1.RELEASE</spring.version>
+    </properties>
+
+</project>

testing-modules/junit-5/src/main/java/com/baeldung/abstractclass/abstractmethod/AbstractMethodCalling.java

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+/**
+ * 
+ */
+package com.baeldung.abstractclass.abstractmethod;
+
+/**
+ * When method calls abstract method.
+ */
+public abstract class AbstractMethodCalling {
+
+    public abstract String abstractFunc();
+
+    public String defaultImpl() {
+        String res = abstractFunc();
+        return (res == null) ? "Default" : (res + " Default");
+    }
+}

testing-modules/junit-5/src/main/java/com/baeldung/abstractclass/indepedentmethod/AbstractIndependent.java

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+package com.baeldung.abstractclass.indepedentmethod;
+
+/**
+ * Test Independent Method
+ * 
+ */
+public abstract class AbstractIndependent {
+
+    public abstract int abstractFunc();
+
+    public String defaultImpl() {
+        return "DEFAULT-1";
+    }
+}

testing-modules/junit-5/src/main/java/com/baeldung/abstractclass/indepedentmethod/ConcreteImpl.java

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+package com.baeldung.abstractclass.indepedentmethod;
+
+public class ConcreteImpl extends AbstractIndependent {
+
+    @Override
+    public int abstractFunc() {
+        return 4;
+    }
+
+}

testing-modules/junit-5/src/main/java/com/baeldung/abstractclass/instancefields/AbstractInstanceFields.java

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+package com.baeldung.abstractclass.instancefields;
+
+/**
+ * Test Independent Method
+ */
+public abstract class AbstractInstanceFields {
+
+    protected int count;
+    private boolean active = false;
+
+    public abstract int abstractFunc();
+
+    public String testFunc() {
+        String response;
+        if (count > 5) {
+            response = "Overflow";
+        } else {
+            response = active ? "Added" : "Blocked";
+        }
+        return response;
+    }
+}

testing-modules/junit-5/src/main/java/com/baeldung/abstractclass/privatemethod/AbstractPrivateMethods.java

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+package com.baeldung.abstractclass.privatemethod;
+
+import java.time.LocalDateTime;
+
+public abstract class AbstractPrivateMethods {
+
+    public abstract int abstractFunc();
+
+    public String defaultImpl() {
+        return getCurrentDateTime() + "DEFAULT-1";
+    }
+
+    private String getCurrentDateTime() {
+        return LocalDateTime.now()
+            .toString();
+    }
+}

testing-modules/junit-5/src/main/java/com/baeldung/junit5/mockito/User.java

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+package com.baeldung.junit5.mockito;
+
+public class User {
+    
+    private Integer id;
+    private String name;
+    private int age;
+    
+    public User() {
+    }
+    
+    public User(String name, int age) {
+        this.name = name;
+        this.age = age;
+    }
+    
+    public Integer getId() {
+        return id;
+    }
+    public void setId(Integer id) {
+        this.id = id;
+    }
+    public String getName() {
+        return name;
+    }
+    public void setName(String name) {
+        this.name = name;
+    }
+    public int getAge() {
+        return age;
+    }
+    public void setAge(int age) {
+        this.age = age;
+    }
+
+    @Override
+    public String toString() {
+        return "User [id=" + id + ", name=" + name + ", age=" + age + "]";
+    }
+
+}

testing-modules/junit-5/src/main/java/com/baeldung/junit5/mockito/repository/MailClient.java

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+package com.baeldung.junit5.mockito.repository;
+
+import com.baeldung.junit5.mockito.User;
+
+public interface MailClient {
+
+    void sendUserRegistrationMail(User user);
+    
+}

testing-modules/junit-5/src/main/java/com/baeldung/junit5/mockito/repository/SettingRepository.java

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+package com.baeldung.junit5.mockito.repository;
+
+public interface SettingRepository {
+    
+    int getUserMinAge();
+
+    int getUserNameMinLength();
+
+}

testing-modules/junit-5/src/main/java/com/baeldung/junit5/mockito/repository/UserRepository.java

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+package com.baeldung.junit5.mockito.repository;
+
+import com.baeldung.junit5.mockito.User;
+
+public interface UserRepository {
+
+    User insert(User user);
+    boolean isUsernameAlreadyExists(String userName);
+    
+}

testing-modules/junit-5/src/main/java/com/baeldung/junit5/mockito/service/DefaultUserService.java

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+package com.baeldung.junit5.mockito.service;
+
+import com.baeldung.junit5.mockito.User;
+import com.baeldung.junit5.mockito.repository.MailClient;
+import com.baeldung.junit5.mockito.repository.SettingRepository;
+import com.baeldung.junit5.mockito.repository.UserRepository;
+
+public class DefaultUserService implements UserService {
+    
+    private UserRepository userRepository;
+    private SettingRepository settingRepository;
+    private MailClient mailClient;
+    
+    public DefaultUserService(UserRepository userRepository, SettingRepository settingRepository, MailClient mailClient) {
+        this.userRepository = userRepository;
+        this.settingRepository = settingRepository;
+        this.mailClient = mailClient;
+    }
+
+    @Override
+    public User register(User user) {
+        validate(user);
+        User insertedUser = userRepository.insert(user);
+        mailClient.sendUserRegistrationMail(insertedUser);
+        return insertedUser;
+    }
+
+    private void validate(User user) {
+        if(user.getName() == null) {
+            throw new RuntimeException(Errors.USER_NAME_REQUIRED);
+        }
+
+        if(user.getName().length() < settingRepository.getUserNameMinLength()) {
+            throw new RuntimeException(Errors.USER_NAME_SHORT);
+        }
+        
+        if(user.getAge() < settingRepository.getUserMinAge()) {
+            throw new RuntimeException(Errors.USER_AGE_YOUNG);
+        }
+        
+        if(userRepository.isUsernameAlreadyExists(user.getName())) {
+            throw new RuntimeException(Errors.USER_NAME_DUPLICATE);
+        }
+    }
+
+}

testing-modules/junit-5/src/main/java/com/baeldung/junit5/mockito/service/Errors.java

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+package com.baeldung.junit5.mockito.service;
+
+public class Errors {
+
+    public static final String USER_NAME_REQUIRED = "user.name.required";
+    public static final String USER_NAME_SHORT = "user.name.short";
+    public static final String USER_AGE_YOUNG = "user.age.young";
+    public static final String USER_NAME_DUPLICATE = "user.name.duplicate";
+    
+}

testing-modules/junit-5/src/main/java/com/baeldung/junit5/mockito/service/UserService.java

@@ -0,0 +1,9 @@
+package com.baeldung.junit5.mockito.service;
+
+import com.baeldung.junit5.mockito.User;
+
+public interface UserService {
+    
+    User register(User user);
+
+}

testing-modules/junit-5/src/main/java/com/baeldung/junit5vstestng/Calculator.java

@@ -0,0 +1,15 @@
+package com.baeldung.junit5vstestng;
+
+public class Calculator {
+
+    public double divide(double a, double b) {
+        if (b == 0) {
+            throw new DivideByZeroException("Divider cannot be equal to zero!");
+        }
+        return a/b;
+    }
+
+}
+
+
+

testing-modules/junit-5/src/main/java/com/baeldung/junit5vstestng/DivideByZeroException.java

@@ -0,0 +1,9 @@
+package com.baeldung.junit5vstestng;
+
+public class DivideByZeroException extends RuntimeException {
+
+    public DivideByZeroException(String message) {
+        super(message);
+    }
+
+}

testing-modules/junit-5/src/main/resources/logback.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<configuration>
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n
+            </pattern>
+        </encoder>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT" />
+    </root>
+</configuration>

testing-modules/junit-5/src/test/java/com/baeldung/AssertionUnitTest.java

@@ -0,0 +1,192 @@
+package com.baeldung;
+
+import static java.time.Duration.ofSeconds;
+import static java.util.Arrays.asList;
+import static org.junit.jupiter.api.Assertions.assertAll;
+import static org.junit.jupiter.api.Assertions.assertArrayEquals;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertIterableEquals;
+import static org.junit.jupiter.api.Assertions.assertLinesMatch;
+import static org.junit.jupiter.api.Assertions.assertNotEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.junit.jupiter.api.Assertions.assertSame;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTimeout;
+import static org.junit.jupiter.api.Assertions.assertTimeoutPreemptively;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.junit.jupiter.api.Assertions.fail;
+
+import java.util.ArrayList;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Optional;
+import java.util.function.BooleanSupplier;
+
+import org.junit.jupiter.api.Disabled;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+
+/**
+ * Unit test that demonstrate the different assertions available within JUnit 4
+ */
+@DisplayName("Test case for assertions")
+public class AssertionUnitTest {
+
+    @Test
+    @DisplayName("Arrays should be equals")
+    public void whenAssertingArraysEquality_thenEqual() {
+        char[] expected = {'J', 'u', 'p', 'i', 't', 'e', 'r'};
+        char[] actual = "Jupiter".toCharArray();
+
+        assertArrayEquals(expected, actual, "Arrays should be equal");
+    }
+
+    @Test
+    @DisplayName("The area of two polygons should be equal")
+    public void whenAssertingEquality_thenEqual() {
+        float square = 2 * 2;
+        float rectangle = 2 * 2;
+
+        assertEquals(square, rectangle);
+    }
+
+    @Test
+    public void whenAssertingEqualityWithDelta_thenEqual() {
+        float square = 2 * 2;
+        float rectangle = 3 * 2;
+        float delta = 2;
+
+        assertEquals(square, rectangle, delta);
+    }
+
+    @Test
+    public void whenAssertingConditions_thenVerified() {
+        assertTrue(5 > 4, "5 is greater the 4");
+        assertTrue(null == null, "null is equal to null");
+    }
+
+    @Test
+    public void whenAssertingNull_thenTrue() {
+        Object cat = null;
+
+        assertNull(cat, () -> "The cat should be null");
+    }
+
+    @Test
+    public void whenAssertingNotNull_thenTrue() {
+        Object dog = new Object();
+
+        assertNotNull(dog, () -> "The dog should not be null");
+    }
+
+    @Test
+    public void whenAssertingSameObject_thenSuccessfull() {
+        String language = "Java";
+        Optional<String> optional = Optional.of(language);
+
+        assertSame(language, optional.get());
+    }
+
+    @Test
+    public void givenBooleanSupplier_whenAssertingCondition_thenVerified() {
+        BooleanSupplier condition = () -> 5 > 6;
+
+        assertFalse(condition, "5 is not greater then 6");
+    }
+
+    @Test
+    @Disabled
+    public void whenFailingATest_thenFailed() {
+        // Test not completed
+        fail("FAIL - test not completed");
+    }
+
+    @Test
+    public void givenMultipleAssertion_whenAssertingAll_thenOK() {
+        Object obj = null;
+        assertAll(
+           "heading",
+           () -> assertEquals(4, 2 * 2, "4 is 2 times 2"),
+           () -> assertEquals("java", "JAVA".toLowerCase()),
+           () -> assertEquals(obj, null, "null is equal to null")
+        );
+    }
+
+    @Test
+    public void givenTwoLists_whenAssertingIterables_thenEquals() {
+        Iterable<String> al = new ArrayList<>(asList("Java", "Junit", "Test"));
+        Iterable<String> ll = new LinkedList<>(asList("Java", "Junit", "Test"));
+
+        assertIterableEquals(al, ll);
+    }
+
+    @Test
+    public void whenAssertingTimeout_thenNotExceeded() {
+        assertTimeout(
+          ofSeconds(2),
+          () -> {
+            // code that requires less then 2 minutes to execute
+            Thread.sleep(1000);
+          }
+        );
+    }
+
+    @Test
+    public void whenAssertingTimeoutPreemptively_thenNotExceeded() {
+        assertTimeoutPreemptively(
+          ofSeconds(2),
+          () -> {
+            // code that requires less then 2 minutes to execute
+            Thread.sleep(1000);
+          }
+        );
+    }
+
+    @Test
+    public void whenAssertingEquality_thenNotEqual() {
+        Integer value = 5; // result of an algorithm
+
+        assertNotEquals(0, value, "The result cannot be 0");
+    }
+
+    @Test
+    public void whenAssertingEqualityListOfStrings_thenEqual() {
+        List<String> expected = asList("Java", "\\d+", "JUnit");
+        List<String> actual = asList("Java", "11", "JUnit");
+
+        assertLinesMatch(expected, actual);
+    }
+
+    @Test
+    void whenAssertingException_thenThrown() {
+        Throwable exception = assertThrows(
+          IllegalArgumentException.class,
+          () -> {
+            throw new IllegalArgumentException("Exception message");
+          }
+        );
+        assertEquals("Exception message", exception.getMessage());
+    }
+
+    @Test
+    public void testConvertToDoubleThrowException() {
+        String age = "eighteen";
+        assertThrows(NumberFormatException.class, () -> {
+            convertToInt(age);
+        });
+
+        assertThrows(NumberFormatException.class, () -> {
+            convertToInt(age);
+        });
+    }
+
+    private static Integer convertToInt(String str) {
+        if (str == null) {
+            return null;
+        }
+        return Integer.valueOf(str);
+    }
+
+}

testing-modules/junit-5/src/test/java/com/baeldung/DynamicTestsExample.java

@@ -0,0 +1,126 @@
+package com.baeldung;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Map;
+import java.util.function.Function;
+import java.util.stream.IntStream;
+import java.util.stream.Stream;
+
+import org.junit.jupiter.api.DynamicTest;
+import org.junit.jupiter.api.TestFactory;
+import org.junit.jupiter.api.function.ThrowingConsumer;
+
+import com.baeldung.helpers.Employee;
+import com.baeldung.helpers.EmployeeDao;
+
+public class DynamicTestsExample {
+
+    @TestFactory
+    Collection<DynamicTest> dynamicTestsWithCollection() {
+        return Arrays.asList(DynamicTest.dynamicTest("Add test", () -> assertEquals(2, Math.addExact(1, 1))), DynamicTest.dynamicTest("Multiply Test", () -> assertEquals(4, Math.multiplyExact(2, 2))));
+    }
+
+    @TestFactory
+    Iterable<DynamicTest> dynamicTestsWithIterable() {
+        return Arrays.asList(DynamicTest.dynamicTest("Add test", () -> assertEquals(2, Math.addExact(1, 1))), DynamicTest.dynamicTest("Multiply Test", () -> assertEquals(4, Math.multiplyExact(2, 2))));
+    }
+
+    @TestFactory
+    Iterator<DynamicTest> dynamicTestsWithIterator() {
+        return Arrays.asList(DynamicTest.dynamicTest("Add test", () -> assertEquals(2, Math.addExact(1, 1))), DynamicTest.dynamicTest("Multiply Test", () -> assertEquals(4, Math.multiplyExact(2, 2))))
+            .iterator();
+    }
+
+    @TestFactory
+    Stream<DynamicTest> dynamicTestsFromIntStream() {
+        return IntStream.iterate(0, n -> n + 2)
+            .limit(10)
+            .mapToObj(n -> DynamicTest.dynamicTest("test" + n, () -> assertTrue(n % 2 == 0)));
+    }
+
+    @TestFactory
+    Stream<DynamicTest> dynamicTestsFromStream() {
+
+        // sample input and output
+        List<String> inputList = Arrays.asList("www.somedomain.com", "www.anotherdomain.com", "www.yetanotherdomain.com");
+        List<String> outputList = Arrays.asList("154.174.10.56", "211.152.104.132", "178.144.120.156");
+
+        // input generator that generates inputs using inputList
+        Iterator<String> inputGenerator = inputList.iterator();
+
+        // a display name generator that creates a different name based on the input
+        Function<String, String> displayNameGenerator = (input) -> "Resolving: " + input;
+
+        // the test executor, which actually has the logic of how to execute the test case
+        DomainNameResolver resolver = new DomainNameResolver();
+        ThrowingConsumer<String> testExecutor = (input) -> {
+            int id = inputList.indexOf(input);
+            assertEquals(outputList.get(id), resolver.resolveDomain(input));
+        };
+
+        // combine everything and return a Stream of DynamicTest
+        return DynamicTest.stream(inputGenerator, displayNameGenerator, testExecutor);
+    }
+
+    @TestFactory
+    Stream<DynamicTest> dynamicTestsFromStreamInJava8() {
+
+        DomainNameResolver resolver = new DomainNameResolver();
+
+        List<String> inputList = Arrays.asList("www.somedomain.com", "www.anotherdomain.com", "www.yetanotherdomain.com");
+        List<String> outputList = Arrays.asList("154.174.10.56", "211.152.104.132", "178.144.120.156");
+
+        return inputList.stream()
+            .map(dom -> DynamicTest.dynamicTest("Resolving: " + dom, () -> {
+                int id = inputList.indexOf(dom);
+                assertEquals(outputList.get(id), resolver.resolveDomain(dom));
+            }));
+
+    }
+
+    @TestFactory
+    Stream<DynamicTest> dynamicTestsForEmployeeWorkflows() {
+        List<Employee> inputList = Arrays.asList(new Employee(1, "Fred"), new Employee(2), new Employee(3, "John"));
+
+        EmployeeDao dao = new EmployeeDao();
+        Stream<DynamicTest> saveEmployeeStream = inputList.stream()
+            .map(emp -> DynamicTest.dynamicTest("saveEmployee: " + emp.toString(), () -> {
+                Employee returned = dao.save(emp.getId());
+                assertEquals(returned.getId(), emp.getId());
+            }));
+
+        Stream<DynamicTest> saveEmployeeWithFirstNameStream = inputList.stream()
+            .filter(emp -> !emp.getFirstName()
+                .isEmpty())
+            .map(emp -> DynamicTest.dynamicTest("saveEmployeeWithName" + emp.toString(), () -> {
+                Employee returned = dao.save(emp.getId(), emp.getFirstName());
+                assertEquals(returned.getId(), emp.getId());
+                assertEquals(returned.getFirstName(), emp.getFirstName());
+            }));
+
+        return Stream.concat(saveEmployeeStream, saveEmployeeWithFirstNameStream);
+    }
+
+    class DomainNameResolver {
+
+        private Map<String, String> ipByDomainName = new HashMap<>();
+
+        DomainNameResolver() {
+            this.ipByDomainName.put("www.somedomain.com", "154.174.10.56");
+            this.ipByDomainName.put("www.anotherdomain.com", "211.152.104.132");
+            this.ipByDomainName.put("www.yetanotherdomain.com", "178.144.120.156");
+        }
+
+        public String resolveDomain(String domainName) {
+            return ipByDomainName.get(domainName);
+        }
+    }
+
+}

testing-modules/junit-5/src/test/java/com/baeldung/EmployeesUnitTest.java

@@ -0,0 +1,50 @@
+package com.baeldung;
+
+import java.sql.SQLException;
+
+import org.apache.logging.log4j.Logger;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+
+import com.baeldung.extensions.EmployeeDaoParameterResolver;
+import com.baeldung.extensions.EmployeeDatabaseSetupExtension;
+import com.baeldung.extensions.EnvironmentExtension;
+import com.baeldung.extensions.IgnoreFileNotFoundExceptionExtension;
+import com.baeldung.extensions.LoggingExtension;
+import com.baeldung.helpers.Employee;
+import com.baeldung.helpers.EmployeeJdbcDao;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+@ExtendWith({ EnvironmentExtension.class, EmployeeDatabaseSetupExtension.class, EmployeeDaoParameterResolver.class })
+@ExtendWith(LoggingExtension.class)
+@ExtendWith(IgnoreFileNotFoundExceptionExtension.class)
+public class EmployeesUnitTest {
+
+    private EmployeeJdbcDao employeeDao;
+
+    private Logger logger;
+
+    public EmployeesUnitTest(EmployeeJdbcDao employeeDao) {
+        this.employeeDao = employeeDao;
+    }
+
+    @Test
+    public void whenAddEmployee_thenGetEmployee() throws SQLException {
+        Employee emp = new Employee(1, "john");
+        employeeDao.add(emp);
+        assertEquals(1, employeeDao.findAll()
+            .size());
+    }
+
+    @Test
+    public void whenGetEmployees_thenEmptyList() throws SQLException {
+        assertEquals(0, employeeDao.findAll()
+            .size());
+    }
+
+    public void setLogger(Logger logger) {
+        this.logger = logger;
+    }
+
+}

testing-modules/junit-5/src/test/java/com/baeldung/MultipleExtensionsUnitTest.java

@@ -0,0 +1,28 @@
+package com.baeldung;
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.Order;
+import org.junit.jupiter.api.extension.RegisterExtension;
+import com.baeldung.extensions.EmployeeDatabaseSetupExtension;
+
+public class MultipleExtensionsUnitTest {
+
+    @Order(1)
+    @RegisterExtension
+    static EmployeeDatabaseSetupExtension SECOND_DB =
+      new EmployeeDatabaseSetupExtension("jdbc:h2:mem:DbTwo;DB_CLOSE_DELAY=-1", "org.h2.Driver", "sa", "");
+
+    @Order(0)
+    @RegisterExtension
+    static EmployeeDatabaseSetupExtension FIRST_DB =
+      new EmployeeDatabaseSetupExtension("jdbc:h2:mem:DbOne;DB_CLOSE_DELAY=-1", "org.h2.Driver", "sa", "");
+
+    @RegisterExtension
+    static EmployeeDatabaseSetupExtension LAST_DB =
+      new EmployeeDatabaseSetupExtension("jdbc:h2:mem:DbLast;DB_CLOSE_DELAY=-1", "org.h2.Driver", "sa", "");
+
+    @Test
+    public void justDemonstratingTheIdea() {
+        // empty test
+    }
+}

testing-modules/junit-5/src/test/java/com/baeldung/NestedUnitTest.java

@@ -0,0 +1,81 @@
+package com.baeldung;
+
+import java.util.EmptyStackException;
+import java.util.Stack;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Nested;
+import org.junit.jupiter.api.Test;
+
+public class NestedUnitTest {
+
+    Stack<Object> stack;
+
+    @Test
+    @DisplayName("is instantiated with new Stack()")
+    void isInstantiatedWithNew() {
+        new Stack<>();
+    }
+
+    @Nested
+    @DisplayName("when new")
+    class WhenNew {
+
+        @BeforeEach
+        void init() {
+            stack = new Stack<>();
+        }
+
+        @Test
+        @DisplayName("is empty")
+        void isEmpty() {
+            Assertions.assertTrue(stack.isEmpty());
+        }
+
+        @Test
+        @DisplayName("throws EmptyStackException when popped")
+        void throwsExceptionWhenPopped() {
+            Assertions.assertThrows(EmptyStackException.class, () -> stack.pop());
+        }
+
+        @Test
+        @DisplayName("throws EmptyStackException when peeked")
+        void throwsExceptionWhenPeeked() {
+            Assertions.assertThrows(EmptyStackException.class, () -> stack.peek());
+        }
+
+        @Nested
+        @DisplayName("after pushing an element")
+        class AfterPushing {
+
+            String anElement = "an element";
+
+            @BeforeEach
+            void init() {
+                stack.push(anElement);
+            }
+
+            @Test
+            @DisplayName("it is no longer empty")
+            void isEmpty() {
+                Assertions.assertFalse(stack.isEmpty());
+            }
+
+            @Test
+            @DisplayName("returns the element when popped and is empty")
+            void returnElementWhenPopped() {
+                Assertions.assertEquals(anElement, stack.pop());
+                Assertions.assertTrue(stack.isEmpty());
+            }
+
+            @Test
+            @DisplayName("returns the element when peeked but remains not empty")
+            void returnElementWhenPeeked() {
+                Assertions.assertEquals(anElement, stack.peek());
+                Assertions.assertFalse(stack.isEmpty());
+            }
+        }
+    }
+}

testing-modules/junit-5/src/test/java/com/baeldung/ProgrammaticEmployeesUnitTest.java

@@ -0,0 +1,40 @@
+package com.baeldung;
+
+import java.sql.SQLException;
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.junit.jupiter.api.extension.RegisterExtension;
+
+import com.baeldung.helpers.Employee;
+import com.baeldung.extensions.EmployeeDaoParameterResolver;
+import com.baeldung.extensions.EmployeeDatabaseSetupExtension;
+import com.baeldung.extensions.EnvironmentExtension;
+import com.baeldung.helpers.EmployeeJdbcDao;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+@ExtendWith({ EnvironmentExtension.class, EmployeeDaoParameterResolver.class })
+public class ProgrammaticEmployeesUnitTest {
+
+    private EmployeeJdbcDao employeeDao;
+
+    @RegisterExtension static EmployeeDatabaseSetupExtension DB =
+      new EmployeeDatabaseSetupExtension("jdbc:h2:mem:AnotherDb;DB_CLOSE_DELAY=-1", "org.h2.Driver", "sa", "");
+
+    public ProgrammaticEmployeesUnitTest(EmployeeJdbcDao employeeDao) {
+        this.employeeDao = employeeDao;
+    }
+
+    @Test
+    public void whenAddEmployee_thenGetEmployee() throws SQLException {
+        Employee emp = new Employee(1, "john");
+        employeeDao.add(emp);
+        assertEquals(1, employeeDao.findAll().size());
+    }
+
+    @Test
+    public void whenGetEmployees_thenEmptyList() throws SQLException {
+        assertEquals(0, employeeDao.findAll().size());
+    }
+}

testing-modules/junit-5/src/test/java/com/baeldung/RegisterExtensionUnitTest.java

@@ -0,0 +1,27 @@
+package com.baeldung;
+
+import com.baeldung.extensions.RegisterExtensionSampleExtension;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.RegisterExtension;
+
+/**
+ * This test demonstrates the use of the same extension in two ways.
+ * 1. Once as instance level field: Only method level callbacks are called.
+ * 2. Once as class level static field: All methods are called.
+ */
+public class RegisterExtensionUnitTest {
+
+    @RegisterExtension
+    static RegisterExtensionSampleExtension staticExtension = new RegisterExtensionSampleExtension("static version");
+
+    @RegisterExtension
+    RegisterExtensionSampleExtension instanceLevelExtension = new RegisterExtensionSampleExtension("instance version");
+
+    @Test
+    public void demoTest() {
+        Assertions.assertEquals("instance version", instanceLevelExtension.getType());
+    }
+
+}

testing-modules/junit-5/src/test/java/com/baeldung/RepeatedTestExample.java

@@ -0,0 +1,52 @@
+package com.baeldung;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.RepeatedTest;
+import org.junit.jupiter.api.RepetitionInfo;
+import org.junit.jupiter.api.TestInfo;
+
+public class RepeatedTestExample {
+
+    @BeforeEach
+    void beforeEachTest() {
+        System.out.println("Before Each Test");
+    }
+
+    @AfterEach
+    void afterEachTest() {
+        System.out.println("After Each Test");
+        System.out.println("=====================");
+    }
+
+    @RepeatedTest(3)
+    void repeatedTest(TestInfo testInfo) {
+        System.out.println("Executing repeated test");
+        assertEquals(2, Math.addExact(1, 1), "1 + 1 should equal 2");
+    }
+
+    @RepeatedTest(value = 3, name = RepeatedTest.LONG_DISPLAY_NAME)
+    void repeatedTestWithLongName() {
+        System.out.println("Executing repeated test with long name");
+        assertEquals(2, Math.addExact(1, 1), "1 + 1 should equal 2");
+    }
+
+    @RepeatedTest(value = 3, name = RepeatedTest.SHORT_DISPLAY_NAME)
+    void repeatedTestWithShortName() {
+        System.out.println("Executing repeated test with long name");
+        assertEquals(2, Math.addExact(1, 1), "1 + 1 should equal 2");
+    }
+
+    @RepeatedTest(value = 3, name = "Custom name {currentRepetition}/{totalRepetitions}")
+    void repeatedTestWithCustomDisplayName() {
+        assertEquals(2, Math.addExact(1, 1), "1 + 1 should equal 2");
+    }
+
+    @RepeatedTest(3)
+    void repeatedTestWithRepetitionInfo(RepetitionInfo repetitionInfo) {
+        System.out.println("Repetition #" + repetitionInfo.getCurrentRepetition());
+        assertEquals(3, repetitionInfo.getTotalRepetitions());
+    }
+}

testing-modules/junit-5/src/test/java/com/baeldung/StringUtils.java

@@ -0,0 +1,11 @@
+package com.baeldung;
+
+public final class StringUtils {
+
+    public static Double convertToDouble(String str) {
+        if (str == null) {
+            return null;
+        }
+        return Double.valueOf(str);
+    }
+}

testing-modules/junit-5/src/test/java/com/baeldung/TaggedUnitTest.java

@@ -0,0 +1,16 @@
+package com.baeldung;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import org.junit.jupiter.api.Tag;
+import org.junit.jupiter.api.Test;
+
+@Tag("Test case")
+public class TaggedUnitTest {
+
+    @Test
+    @Tag("Method")
+    void testMethod() {
+        assertEquals(2 + 2, 4);
+    }
+}

testing-modules/junit-5/src/test/java/com/baeldung/TestLauncher.java

@@ -0,0 +1,39 @@
+package com.baeldung;
+
+import org.junit.platform.launcher.LauncherDiscoveryRequest;
+import org.junit.platform.launcher.TestExecutionListener;
+import org.junit.platform.launcher.TestPlan;
+import org.junit.platform.launcher.core.LauncherDiscoveryRequestBuilder;
+import org.junit.platform.launcher.core.LauncherFactory;
+import org.junit.platform.launcher.listeners.SummaryGeneratingListener;
+
+import static org.junit.platform.engine.discovery.DiscoverySelectors.selectClass;
+
+import java.io.PrintWriter;
+
+import org.junit.platform.launcher.Launcher;
+
+public class TestLauncher {
+    public static void main(String[] args) {
+
+        //@formatter:off
+        LauncherDiscoveryRequest request = LauncherDiscoveryRequestBuilder.request()
+                .selectors(selectClass("com.baeldung.EmployeesUnitTest"))
+                .configurationParameter("junit.conditions.deactivate", "com.baeldung.extensions.*")
+                .configurationParameter("junit.jupiter.extensions.autodetection.enabled", "true")
+                .build();
+        
+        //@formatter:on
+
+        TestPlan plan = LauncherFactory.create()
+            .discover(request);
+        Launcher launcher = LauncherFactory.create();
+        SummaryGeneratingListener summaryGeneratingListener = new SummaryGeneratingListener();
+        launcher.execute(request, new TestExecutionListener[] { summaryGeneratingListener });
+        launcher.execute(request);
+
+        summaryGeneratingListener.getSummary()
+            .printTo(new PrintWriter(System.out));
+
+    }
+}

testing-modules/junit-5/src/test/java/com/baeldung/abstractclass/abstractmethod/AbstractMethodCallingUnitTest.java

@@ -0,0 +1,38 @@
+package com.baeldung.abstractclass.abstractmethod;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.mockito.Mockito;
+
+public class AbstractMethodCallingUnitTest {
+
+    private AbstractMethodCalling cls;
+
+    @BeforeEach
+    public void setup() {
+        cls = Mockito.mock(AbstractMethodCalling.class);
+    }
+
+    @Test
+    public void givenDefaultImpl_whenMockAbstractFunc_thenExpectedBehaviour() {
+        Mockito
+          .when(cls.abstractFunc())
+          .thenReturn("Abstract");
+        Mockito
+          .doCallRealMethod()
+          .when(cls)
+          .defaultImpl();
+
+        // validate result by mock abstractFunc's behaviour
+        Assertions.assertEquals("Abstract Default", cls.defaultImpl());
+
+        // check the value with null response from abstract method
+        Mockito
+          .doReturn(null)
+          .when(cls)
+          .abstractFunc();
+        Assertions.assertEquals("Default", cls.defaultImpl());
+    }
+
+}

testing-modules/junit-5/src/test/java/com/baeldung/abstractclass/indepedentmethod/AbstractIndependentUnitTest.java

@@ -0,0 +1,25 @@
+/**
+ * 
+ */
+package com.baeldung.abstractclass.indepedentmethod;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+import org.mockito.Mockito;
+
+public class AbstractIndependentUnitTest {
+
+    @Test
+    public void givenNonAbstractMethod_whenConcreteImpl_testCorrectBehaviour() {
+        ConcreteImpl conClass = new ConcreteImpl();
+        String actual = conClass.defaultImpl();
+
+        Assertions.assertEquals("DEFAULT-1", actual);
+    }
+
+    @Test
+    public void givenNonAbstractMethod_whenMockitoMock_testCorrectBehaviour() {
+        AbstractIndependent absCls = Mockito.mock(AbstractIndependent.class, Mockito.CALLS_REAL_METHODS);
+        Assertions.assertEquals("DEFAULT-1", absCls.defaultImpl());
+    }
+}

testing-modules/junit-5/src/test/java/com/baeldung/abstractclass/instancefields/AbstractInstanceFieldsUnitTest.java

@@ -0,0 +1,42 @@
+package com.baeldung.abstractclass.instancefields;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+import org.mockito.Mockito;
+import org.powermock.api.mockito.PowerMockito;
+import org.powermock.reflect.Whitebox;
+
+public class AbstractInstanceFieldsUnitTest {
+
+    @Test
+    public void givenProtectedInstanceField_whenMockClassCountGt5_thenTestNonAbstractMethod() {
+
+        // mock
+        AbstractInstanceFields instClass = Mockito.mock(AbstractInstanceFields.class);
+        Mockito
+          .doCallRealMethod()
+          .when(instClass)
+          .testFunc();
+
+        // set counter greater than 5
+        instClass.count = 7;
+
+        // compare the result
+        Assertions.assertEquals("Overflow", instClass.testFunc());
+    }
+
+    @Test
+    public void givenNonAbstractMethodAndPrivateField_whenPowerMockitoAndActiveFieldTrue_thenCorrectBehaviour() {
+
+        AbstractInstanceFields instClass = PowerMockito.mock(AbstractInstanceFields.class);
+        PowerMockito
+          .doCallRealMethod()
+          .when(instClass)
+          .testFunc();
+        Whitebox.setInternalState(instClass, "active", true);
+
+        // compare the expected result with actual
+        Assertions.assertEquals("Added", instClass.testFunc());
+    }
+
+}

testing-modules/junit-5/src/test/java/com/baeldung/abstractclass/privatemethod/AbstractPrivateMethodsUnitTest.java

@@ -0,0 +1,41 @@
+/**
+ *
+ */
+package com.baeldung.abstractclass.privatemethod;
+
+import org.junit.Test;
+import org.junit.jupiter.api.Assertions;
+import org.junit.runner.RunWith;
+import org.powermock.api.mockito.PowerMockito;
+import org.powermock.core.classloader.annotations.PrepareForTest;
+import org.powermock.modules.junit4.PowerMockRunner;
+
+import java.time.LocalDateTime;
+
+/**
+ * Providing custom values for private methods using powermock
+ *
+ */
+@RunWith(PowerMockRunner.class)
+@PrepareForTest(AbstractPrivateMethods.class)
+public class AbstractPrivateMethodsUnitTest {
+
+    @Test
+    public void givenNonAbstractMethodAndCallPrivateMethod_whenMockPrivateMethod_thenVerifyBehaviour() throws Exception {
+        AbstractPrivateMethods mockClass = PowerMockito.mock(AbstractPrivateMethods.class);
+
+        String dateTime = LocalDateTime
+          .now()
+          .toString();
+        PowerMockito
+          .doCallRealMethod()
+          .when(mockClass)
+          .defaultImpl();
+        PowerMockito
+          .doReturn(dateTime)
+          .when(mockClass, "getCurrentDateTime");// .thenReturn(dateTime);
+        String actual = mockClass.defaultImpl();
+        Assertions.assertEquals(dateTime + "DEFAULT-1", actual);
+    }
+
+}

testing-modules/junit-5/src/test/java/com/baeldung/conditional/ConditionalAnnotationsUnitTest.java

@@ -0,0 +1,119 @@
+package com.baeldung.conditional;
+
+import org.junit.jupiter.api.RepeatedTest;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.condition.*;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+public class ConditionalAnnotationsUnitTest {
+    @Test
+    @EnabledOnOs({OS.WINDOWS, OS.MAC})
+    public void shouldRunBothWindowsAndMac() {
+        System.out.println("runs on Windows and Mac");
+    }
+
+    @Test
+    @DisabledOnOs(OS.LINUX)
+    public void shouldNotRunAtLinux() {
+        System.out.println("will not run on Linux");
+    }
+
+    @Test
+    @EnabledOnJre({JRE.JAVA_10, JRE.JAVA_11})
+    public void shouldOnlyRunOnJava10And11() {
+        System.out.println("runs with java 10 and 11");
+    }
+
+    @Test
+    @DisabledOnJre(JRE.OTHER)
+    public void thisTestOnlyRunsWithUpToDateJREs() {
+        System.out.println("this test will only run on java8, 9, 10 and 11.");
+    }
+
+    @Test
+    @EnabledIfSystemProperty(named = "java.vm.vendor", matches = "Oracle.*")
+    public void onlyIfVendorNameStartsWithOracle() {
+        System.out.println("runs only if vendor name starts with Oracle");
+    }
+
+    @Test
+    @DisabledIfSystemProperty(named = "file.separator", matches = "[/]")
+    public void disabledIfFileSeperatorIsSlash() {
+        System.out.println("Will not run if file.sepeartor property is /");
+    }
+
+    @Test
+    @EnabledIfEnvironmentVariable(named = "GDMSESSION", matches = "ubuntu")
+    public void onlyRunOnUbuntuServer() {
+        System.out.println("only runs if GDMSESSION is ubuntu");
+    }
+
+    @Test
+    @DisabledIfEnvironmentVariable(named = "LC_TIME", matches = ".*UTF-8.")
+    public void shouldNotRunWhenTimeIsNotUTF8() {
+        System.out.println("will not run if environment variable LC_TIME is UTF-8");
+    }
+
+    @Test
+    @EnabledIf("'FR' == systemProperty.get('user.country')")
+    public void onlyFrenchPeopleWillRunThisMethod() {
+        System.out.println("will run only if user.country is FR");
+    }
+
+    @Test
+    @DisabledIf("java.lang.System.getProperty('os.name').toLowerCase().contains('mac')")
+    public void shouldNotRunOnMacOS() {
+        System.out.println("will not run if our os.name is mac");
+    }
+
+    @Test
+    @EnabledIf(value = {
+            "load('nashorn:mozilla_compat.js')",
+            "importPackage(java.time)",
+            "",
+            "var thisMonth = LocalDate.now().getMonth().name()",
+            "var february = Month.FEBRUARY.name()",
+            "thisMonth.equals(february)"
+    },
+            engine = "nashorn",
+            reason = "Self-fulfilling: {result}")
+    public void onlyRunsInFebruary() {
+        System.out.println("this test only runs in February");
+    }
+
+    @Test
+    @DisabledIf("systemEnvironment.get('XPC_SERVICE_NAME') != null " +
+            "&& systemEnvironment.get('XPC_SERVICE_NAME').contains('intellij')")
+    public void notValidForIntelliJ() {
+        System.out.println("this test will run if our ide is INTELLIJ");
+    }
+
+    @Target(ElementType.METHOD)
+    @Retention(RetentionPolicy.RUNTIME)
+    @Test
+    @DisabledOnOs({OS.WINDOWS, OS.SOLARIS, OS.OTHER})
+    @EnabledOnJre({JRE.JAVA_9, JRE.JAVA_10, JRE.JAVA_11})
+    @interface ThisTestWillOnlyRunAtLinuxAndMacWithJava9Or10Or11 {
+    }
+
+    @ThisTestWillOnlyRunAtLinuxAndMacWithJava9Or10Or11
+    public void someSuperTestMethodHere() {
+        System.out.println("this method will run with java9, 10, 11 and Linux or macOS.");
+    }
+
+    @Target(ElementType.METHOD)
+    @Retention(RetentionPolicy.RUNTIME)
+    @DisabledIf("Math.random() >= 0.5")
+    @interface CoinToss {
+    }
+
+    @RepeatedTest(2)
+    @CoinToss
+    public void gamble() {
+        System.out.println("This tests run status is a gamble with %50 rate");
+    }
+}

testing-modules/junit-5/src/test/java/com/baeldung/extensions/EmployeeDaoParameterResolver.java

@@ -0,0 +1,25 @@
+package com.baeldung.extensions;
+
+import org.junit.jupiter.api.extension.ExtensionContext;
+import org.junit.jupiter.api.extension.ParameterContext;
+import org.junit.jupiter.api.extension.ParameterResolutionException;
+import org.junit.jupiter.api.extension.ParameterResolver;
+
+import com.baeldung.helpers.EmployeeJdbcDao;
+import com.baeldung.helpers.JdbcConnectionUtil;
+
+public class EmployeeDaoParameterResolver implements ParameterResolver {
+
+    @Override
+    public boolean supportsParameter(ParameterContext parameterContext, ExtensionContext extensionContext) throws ParameterResolutionException {
+        return parameterContext.getParameter()
+            .getType()
+            .equals(EmployeeJdbcDao.class);
+    }
+
+    @Override
+    public Object resolveParameter(ParameterContext parameterContext, ExtensionContext extensionContext) throws ParameterResolutionException {
+        return new EmployeeJdbcDao(JdbcConnectionUtil.getConnection());
+    }
+
+}

testing-modules/junit-5/src/test/java/com/baeldung/extensions/EmployeeDatabaseSetupExtension.java

@@ -0,0 +1,56 @@
+package com.baeldung.extensions;
+
+import java.sql.Connection;
+import java.sql.SQLException;
+import java.sql.Savepoint;
+
+import org.junit.jupiter.api.extension.AfterAllCallback;
+import org.junit.jupiter.api.extension.AfterEachCallback;
+import org.junit.jupiter.api.extension.BeforeAllCallback;
+import org.junit.jupiter.api.extension.BeforeEachCallback;
+import org.junit.jupiter.api.extension.ExtensionContext;
+
+import com.baeldung.helpers.EmployeeJdbcDao;
+import com.baeldung.helpers.JdbcConnectionUtil;
+
+public class EmployeeDatabaseSetupExtension implements BeforeAllCallback, AfterAllCallback, BeforeEachCallback, AfterEachCallback {
+
+    private Connection con;
+    private EmployeeJdbcDao employeeDao;
+    private Savepoint savepoint;
+
+    public EmployeeDatabaseSetupExtension() {
+        con = JdbcConnectionUtil.getConnection();
+        employeeDao = new EmployeeJdbcDao(con);
+    }
+
+    public EmployeeDatabaseSetupExtension(String jdbcUrl, String driver, String username, String password) {
+        con = JdbcConnectionUtil.getConnection(jdbcUrl, driver, username, password);
+        employeeDao = new EmployeeJdbcDao(con);
+    }
+
+    @Override
+    public void afterAll(ExtensionContext context) throws SQLException {
+        if (con != null) {
+            con.close();
+        }
+    }
+
+    @Override
+    public void beforeAll(ExtensionContext context) throws SQLException {
+        employeeDao.createTable();
+
+    }
+
+    @Override
+    public void afterEach(ExtensionContext context) throws SQLException {
+        con.rollback(savepoint);
+    }
+
+    @Override
+    public void beforeEach(ExtensionContext context) throws SQLException {
+        con.setAutoCommit(false);
+        savepoint = con.setSavepoint("before");
+    }
+
+}

testing-modules/junit-5/src/test/java/com/baeldung/extensions/EnvironmentExtension.java

@@ -0,0 +1,27 @@
+package com.baeldung.extensions;
+
+import java.io.IOException;
+import java.util.Properties;
+
+import org.junit.jupiter.api.extension.ConditionEvaluationResult;
+import org.junit.jupiter.api.extension.ExecutionCondition;
+import org.junit.jupiter.api.extension.ExtensionContext;
+
+public class EnvironmentExtension implements ExecutionCondition {
+
+    @Override
+    public ConditionEvaluationResult evaluateExecutionCondition(ExtensionContext context) {
+        Properties props = new Properties();
+
+        try {
+            props.load(EnvironmentExtension.class.getResourceAsStream("application.properties"));
+            String env = props.getProperty("env");
+            if ("qa".equalsIgnoreCase(env)) {
+                return ConditionEvaluationResult.disabled("Test disabled on QA environment");
+            }
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+        return ConditionEvaluationResult.enabled("Test enabled on QA environment");
+    }
+}

testing-modules/junit-5/src/test/java/com/baeldung/extensions/IgnoreFileNotFoundExceptionExtension.java

@@ -0,0 +1,23 @@
+package com.baeldung.extensions;
+
+import java.io.FileNotFoundException;
+
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+import org.junit.jupiter.api.extension.ExtensionContext;
+import org.junit.jupiter.api.extension.TestExecutionExceptionHandler;
+
+public class IgnoreFileNotFoundExceptionExtension implements TestExecutionExceptionHandler {
+
+    Logger logger = LogManager.getLogger(IgnoreFileNotFoundExceptionExtension.class);
+
+    @Override
+    public void handleTestExecutionException(ExtensionContext context, Throwable throwable) throws Throwable {
+
+        if (throwable instanceof FileNotFoundException) {
+            logger.error("File not found:" + throwable.getMessage());
+            return;
+        }
+        throw throwable;
+    }
+}

testing-modules/junit-5/src/test/java/com/baeldung/extensions/LoggingExtension.java

@@ -0,0 +1,18 @@
+package com.baeldung.extensions;
+
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+import org.junit.jupiter.api.extension.ExtensionContext;
+import org.junit.jupiter.api.extension.TestInstancePostProcessor;
+
+public class LoggingExtension implements TestInstancePostProcessor {
+
+    @Override
+    public void postProcessTestInstance(Object testInstance, ExtensionContext context) throws Exception {
+        Logger logger = LogManager.getLogger(testInstance.getClass());
+        testInstance.getClass()
+            .getMethod("setLogger", Logger.class)
+            .invoke(testInstance, logger);
+    }
+
+}

testing-modules/junit-5/src/test/java/com/baeldung/extensions/RegisterExtensionSampleExtension.java

@@ -0,0 +1,34 @@
+package com.baeldung.extensions;
+
+import org.junit.jupiter.api.extension.BeforeAllCallback;
+import org.junit.jupiter.api.extension.BeforeEachCallback;
+import org.junit.jupiter.api.extension.ExtensionContext;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * This extension is meant to demonstrate the use of RegisterExtension.
+ */
+public class RegisterExtensionSampleExtension implements BeforeAllCallback, BeforeEachCallback {
+
+    private final String type;
+    Logger logger = LoggerFactory.getLogger(RegisterExtensionSampleExtension.class);
+
+    public RegisterExtensionSampleExtension(String type) {
+        this.type = type;
+    }
+
+    @Override
+    public void beforeAll(ExtensionContext extensionContext) throws Exception {
+        logger.info("Type {} In beforeAll : {}", type, extensionContext.getDisplayName());
+    }
+
+    @Override
+    public void beforeEach(ExtensionContext extensionContext) throws Exception {
+        logger.info("Type {} In beforeEach : {}", type, extensionContext.getDisplayName());
+    }
+
+    public String getType() {
+        return type;
+    }
+}

testing-modules/junit-5/src/test/java/com/baeldung/helpers/Employee.java

@@ -0,0 +1,38 @@
+package com.baeldung.helpers;
+
+public class Employee {
+
+    private long id;
+    private String firstName;
+
+    public Employee(long id) {
+        this.id = id;
+        this.firstName = "";
+    }
+
+    public Employee(long id, String firstName) {
+        this.id = id;
+        this.firstName = firstName;
+    }
+
+    public long getId() {
+        return id;
+    }
+
+    public void setId(long id) {
+        this.id = id;
+    }
+
+    public String getFirstName() {
+        return firstName;
+    }
+
+    public void setFirstName(String firstName) {
+        this.firstName = firstName;
+    }
+
+    @Override
+    public String toString() {
+        return "Employee [id=" + id + ", firstName=" + firstName + "]";
+    }
+}

testing-modules/junit-5/src/test/java/com/baeldung/helpers/EmployeeDao.java

@@ -0,0 +1,16 @@
+package com.baeldung.helpers;
+
+public class EmployeeDao {
+
+    public Employee save(long id) {
+        return new Employee(id);
+    }
+
+    public Employee save(long id, String firstName) {
+        return new Employee(id, firstName);
+    }
+
+    public Employee update(Employee employee) {
+        return employee;
+    }
+}

testing-modules/junit-5/src/test/java/com/baeldung/helpers/EmployeeJdbcDao.java

@@ -0,0 +1,51 @@
+package com.baeldung.helpers;
+
+import java.sql.Connection;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.ArrayList;
+import java.util.List;
+
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+
+public class EmployeeJdbcDao {
+
+    private Connection con;
+
+    public EmployeeJdbcDao(Connection con) {
+        this.con = con;
+    }
+
+    public void createTable() throws SQLException {
+        String createQuery = "CREATE TABLE IF NOT EXISTS employees(id long primary key, firstName varchar(50))";
+        PreparedStatement pstmt = con.prepareStatement(createQuery);
+
+        pstmt.execute();
+    }
+
+    public void add(Employee emp) throws SQLException {
+        String insertQuery = "INSERT INTO employees(id, firstName) VALUES(?,?)";
+        PreparedStatement pstmt = con.prepareStatement(insertQuery);
+        pstmt.setLong(1, emp.getId());
+        pstmt.setString(2, emp.getFirstName());
+
+        pstmt.executeUpdate();
+
+    }
+
+    public List<Employee> findAll() throws SQLException {
+        List<Employee> employees = new ArrayList<>();
+        String query = "SELECT * FROM employees";
+        PreparedStatement pstmt = con.prepareStatement(query);
+
+        ResultSet rs = pstmt.executeQuery();
+        while (rs.next()) {
+            Employee emp = new Employee(rs.getLong("id"), rs.getString("firstName"));
+            employees.add(emp);
+        }
+
+        return employees;
+    }
+}

testing-modules/junit-5/src/test/java/com/baeldung/helpers/JdbcConnectionUtil.java

@@ -0,0 +1,59 @@
+package com.baeldung.helpers;
+
+import java.io.IOException;
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.SQLException;
+import java.util.Properties;
+
+public class JdbcConnectionUtil {
+
+    private static Connection con;
+
+    public static Connection getConnection() {
+        if (con == null || isClosed(con)) {
+            try {
+                Properties props = new Properties();
+                props.load(JdbcConnectionUtil.class.getResourceAsStream("jdbc.properties"));
+
+                String jdbcUrl = props.getProperty("jdbc.url");
+                String driver = props.getProperty("jdbc.driver");
+                String username = props.getProperty("jdbc.user");
+                String password = props.getProperty("jdbc.password");
+                con = getConnection(jdbcUrl, driver, username, password);
+                return con;
+            } catch (IOException exc) {
+                exc.printStackTrace();
+            }
+
+            return null;
+        }
+        return con;
+    }
+
+    public static Connection getConnection(String jdbcUrl, String driver, String username, String password) {
+        if (con == null || isClosed(con)) {
+            try {
+                Class.forName(driver);
+                con = DriverManager.getConnection(jdbcUrl, username, password);
+                return con;
+            } catch (ClassNotFoundException exc) {
+                exc.printStackTrace();
+            } catch (SQLException exc) {
+                exc.printStackTrace();
+            }
+
+            return null;
+        }
+
+        return con;
+    }
+
+    private static boolean isClosed(Connection con) {
+        try {
+            return con.isClosed();
+        } catch (SQLException e) {
+            return true;
+        }
+    }
+}

testing-modules/junit-5/src/test/java/com/baeldung/junit4vstestng/SortedUnitTest.java

@@ -0,0 +1,22 @@
+package com.baeldung.junit4vstestng;
+
+import static org.junit.Assert.assertTrue;
+
+import org.junit.FixMethodOrder;
+import org.junit.Test;
+import org.junit.runners.MethodSorters;
+
+@FixMethodOrder(MethodSorters.NAME_ASCENDING)
+public class SortedUnitTest {
+
+    @Test
+    public void a_givenString_whenChangedtoInt_thenTrue() {
+        assertTrue(Integer.valueOf("10") instanceof Integer);
+    }
+
+    @Test
+    public void b_givenInt_whenChangedtoString_thenTrue() {
+        assertTrue(String.valueOf(10) instanceof String);
+    }
+
+}

testing-modules/junit-5/src/test/java/com/baeldung/junit4vstestng/SummationServiceIntegrationTest.java

@@ -0,0 +1,58 @@
+package com.baeldung.junit4vstestng;
+
+import org.junit.After;
+import org.junit.AfterClass;
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.BeforeClass;
+import org.junit.Ignore;
+import org.junit.Test;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class SummationServiceIntegrationTest {
+    private static List<Integer> numbers;
+
+    @BeforeClass
+    public static void initialize() {
+        numbers = new ArrayList<>();
+    }
+
+    @AfterClass
+    public static void tearDown() {
+        numbers = null;
+    }
+
+    @Before
+    public void runBeforeEachTest() {
+        numbers.add(1);
+        numbers.add(2);
+        numbers.add(3);
+    }
+
+    @After
+    public void runAfterEachTest() {
+        numbers.clear();
+    }
+
+    @Test
+    public void givenNumbers_sumEquals_thenCorrect() {
+        int sum = numbers.stream()
+            .reduce(0, Integer::sum);
+        Assert.assertEquals(6, sum);
+    }
+
+    @Ignore
+    @Test
+    public void givenEmptyList_sumEqualsZero_thenCorrect() {
+        int sum = numbers.stream()
+            .reduce(0, Integer::sum);
+        Assert.assertEquals(6, sum);
+    }
+
+    @Test(expected = ArithmeticException.class)
+    public void givenNumber_whenThrowsException_thenCorrect() {
+        int i = 1 / 0;
+    }
+}

testing-modules/junit-5/src/test/java/com/baeldung/junit5/mockito/UserServiceUnitTest.java

@@ -0,0 +1,126 @@
+package com.baeldung.junit5.mockito;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.fail;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.*;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.junit.platform.runner.JUnitPlatform;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.Mockito;
+import org.mockito.invocation.InvocationOnMock;
+import org.mockito.junit.jupiter.MockitoExtension;
+import org.mockito.stubbing.Answer;
+
+import com.baeldung.junit5.mockito.repository.MailClient;
+import com.baeldung.junit5.mockito.repository.SettingRepository;
+import com.baeldung.junit5.mockito.repository.UserRepository;
+import com.baeldung.junit5.mockito.service.DefaultUserService;
+import com.baeldung.junit5.mockito.service.Errors;
+import com.baeldung.junit5.mockito.service.UserService;
+
+@ExtendWith(MockitoExtension.class)
+@RunWith(JUnitPlatform.class)
+public class UserServiceUnitTest {
+    
+    UserService userService;
+    SettingRepository settingRepository;
+    @Mock UserRepository userRepository;
+    @Mock MailClient mailClient;
+
+    User user;
+    
+    @BeforeEach
+    void init(@Mock SettingRepository settingRepository) {
+        userService = new DefaultUserService(userRepository, settingRepository, mailClient);
+        lenient().when(settingRepository.getUserMinAge()).thenReturn(10);
+        when(settingRepository.getUserNameMinLength()).thenReturn(4);
+        lenient().when(userRepository.isUsernameAlreadyExists(any(String.class))).thenReturn(false);
+        this.settingRepository = settingRepository;
+    }
+    
+    @Test
+    void givenValidUser_whenSaveUser_thenSucceed(@Mock MailClient mailClient) {
+        // Given
+        user = new User("Jerry", 12);
+        when(userRepository.insert(any(User.class))).then(new Answer<User>() {
+            int sequence = 1;
+            
+            @Override
+            public User answer(InvocationOnMock invocation) throws Throwable {
+                User user = (User) invocation.getArgument(0);
+                user.setId(sequence++);
+                return user;
+            }
+        });
+
+        userService = new DefaultUserService(userRepository, settingRepository, mailClient);
+
+        // When
+        User insertedUser = userService.register(user);
+        
+        // Then
+        verify(userRepository).insert(user);
+        Assertions.assertNotNull(user.getId());
+        verify(mailClient).sendUserRegistrationMail(insertedUser);
+    }
+
+    @Test
+    void givenShortName_whenSaveUser_thenGiveShortUsernameError() {
+        // Given
+        user = new User("tom", 12);
+        
+        // When
+        try {
+            userService.register(user);
+            fail("Should give an error");
+        } catch(Exception ex) {
+            assertEquals(ex.getMessage(), Errors.USER_NAME_SHORT);
+        }
+        
+        // Then
+        verify(userRepository, never()).insert(user);
+    }
+    
+    @Test
+    void givenSmallAge_whenSaveUser_thenGiveYoungUserError() {
+        // Given
+        user = new User("jerry", 3);
+        
+        // When
+        try {
+            userService.register(user);
+            fail("Should give an error");
+        } catch(Exception ex) {
+            assertEquals(ex.getMessage(), Errors.USER_AGE_YOUNG);
+        }
+        
+        // Then
+        verify(userRepository, never()).insert(user);
+    }
+    
+    @Test
+    void givenUserWithExistingName_whenSaveUser_thenGiveUsernameAlreadyExistsError() {
+        // Given
+        user = new User("jerry", 12);
+        Mockito.reset(userRepository);
+        when(userRepository.isUsernameAlreadyExists(any(String.class))).thenReturn(true);
+        
+        // When
+        try {
+            userService.register(user);
+            fail("Should give an error");
+        } catch(Exception ex) {
+            assertEquals(ex.getMessage(), Errors.USER_NAME_DUPLICATE);
+        }
+        
+        // Then
+        verify(userRepository, never()).insert(user);
+    }
+    
+}

testing-modules/junit-5/src/test/java/com/baeldung/junit5/order/AlphanumericOrderUnitTest.java

@@ -0,0 +1,33 @@
+package com.baeldung.junit5.order;
+
+import static org.junit.Assert.assertEquals;
+
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.MethodOrderer.Alphanumeric;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.TestMethodOrder;
+
+@TestMethodOrder(Alphanumeric.class)
+public class AlphanumericOrderUnitTest {
+    private static StringBuilder output = new StringBuilder("");
+    
+    @Test
+    public void myATest() {
+        output.append("A");
+    }
+    
+    @Test
+    public void myBTest() {
+        output.append("B");        
+    }
+    
+    @Test
+    public void myaTest() {
+        output.append("a");
+    }
+ 
+    @AfterAll
+    public static void assertOutput() {
+        assertEquals(output.toString(), "ABa");
+    }
+}

testing-modules/junit-5/src/test/java/com/baeldung/junit5/order/CustomOrder.java

@@ -0,0 +1,12 @@
+package com.baeldung.junit5.order;
+
+import org.junit.jupiter.api.MethodDescriptor;
+import org.junit.jupiter.api.MethodOrderer;
+import org.junit.jupiter.api.MethodOrdererContext;
+
+public class CustomOrder implements MethodOrderer{
+    @Override
+    public void orderMethods(MethodOrdererContext context) {
+        context.getMethodDescriptors().sort((MethodDescriptor m1, MethodDescriptor m2)->m1.getMethod().getName().compareToIgnoreCase(m2.getMethod().getName()));
+    }
+}

testing-modules/junit-5/src/test/java/com/baeldung/junit5/order/CustomOrderUnitTest.java

@@ -0,0 +1,33 @@
+package com.baeldung.junit5.order;
+
+import static org.junit.Assert.assertEquals;
+
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.TestMethodOrder;
+
+@TestMethodOrder(CustomOrder.class)
+public class CustomOrderUnitTest {
+    private static StringBuilder output = new StringBuilder("");
+    
+    @Test
+    public void myATest() {
+        output.append("A");
+    }
+    
+    @Test
+    public void myBTest() {
+        output.append("B");        
+    }
+    
+    @Test
+    public void myaTest() {
+        output.append("a");
+    }
+
+ 
+    @AfterAll
+    public static void assertOutput() {
+        assertEquals(output.toString(), "AaB");
+    }
+}

testing-modules/junit-5/src/test/java/com/baeldung/junit5/order/OrderAnnotationUnitTest.java

@@ -0,0 +1,37 @@
+package com.baeldung.junit5.order;
+
+import static org.junit.Assert.assertEquals;
+
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.MethodOrderer.OrderAnnotation;
+import org.junit.jupiter.api.Order;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.TestMethodOrder;
+
+@TestMethodOrder(OrderAnnotation.class)
+public class OrderAnnotationUnitTest {
+    private static StringBuilder output = new StringBuilder("");
+    
+    @Test
+    @Order(1)    
+    public void firstTest() {
+        output.append("a");
+    }
+    
+    @Test
+    @Order(2)    
+    public void secondTest() {
+        output.append("b");
+    }
+ 
+    @Test
+    @Order(3)    
+    public void thirdTest() {
+        output.append("c");
+    }
+ 
+    @AfterAll
+    public static void assertOutput() {
+        assertEquals(output.toString(), "abc");
+    }
+}

testing-modules/junit-5/src/test/java/com/baeldung/junit5vstestng/CalculatorUnitTest.java

@@ -0,0 +1,17 @@
+package com.baeldung.junit5vstestng;
+
+import org.junit.Test;
+
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+public class CalculatorUnitTest {
+
+    @Test
+    public void whenDividerIsZero_thenDivideByZeroExceptionIsThrown() {
+        Calculator calculator = new Calculator();
+
+        assertThrows(DivideByZeroException.class,
+                () -> calculator.divide(10, 0));
+    }
+
+}

testing-modules/junit-5/src/test/java/com/baeldung/junit5vstestng/Class1UnitTest.java

@@ -0,0 +1,15 @@
+package com.baeldung.junit5vstestng;
+
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import org.junit.Test;
+
+
+public class Class1UnitTest {
+
+    @Test
+    public void testCase_InClass1UnitTest() {
+        assertTrue(true);
+    }
+    
+}

testing-modules/junit-5/src/test/java/com/baeldung/junit5vstestng/Class2UnitTest.java

@@ -0,0 +1,14 @@
+package com.baeldung.junit5vstestng;
+
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import org.junit.Test;
+
+public class Class2UnitTest {
+
+    @Test
+    public void testCase_InClass2UnitTest() {
+        assertTrue(true);
+    }
+    
+}

testing-modules/junit-5/src/test/java/com/baeldung/junit5vstestng/CustomNameUnitTest.java

@@ -0,0 +1,17 @@
+package com.baeldung.junit5vstestng;
+
+import static org.junit.Assert.assertNotNull;
+
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.ValueSource;
+
+public class CustomNameUnitTest {
+
+    @ParameterizedTest
+    @ValueSource(strings = { "Hello", "World" })
+    @DisplayName("Test Method to check that the inputs are not nullable")
+    void givenString_TestNullOrNot(String word) {
+        assertNotNull(word);
+    }
+}

testing-modules/junit-5/src/test/java/com/baeldung/junit5vstestng/ParameterizedUnitTest.java

@@ -0,0 +1,45 @@
+package com.baeldung.junit5vstestng;
+
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertTrue;
+
+import java.util.EnumSet;
+import java.util.stream.Stream;
+
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.CsvSource;
+import org.junit.jupiter.params.provider.EnumSource;
+import org.junit.jupiter.params.provider.MethodSource;
+import org.junit.jupiter.params.provider.ValueSource;
+
+public class ParameterizedUnitTest {
+
+    @ParameterizedTest
+    @ValueSource(strings = { "Hello", "World" })
+    void givenString_TestNullOrNot(String word) {
+        assertNotNull(word);
+    }
+    
+    @ParameterizedTest
+    @EnumSource(value = PizzaDeliveryStrategy.class, names = {"EXPRESS", "NORMAL"})
+    void givenEnum_TestContainsOrNot(PizzaDeliveryStrategy timeUnit) {
+        assertTrue(EnumSet.of(PizzaDeliveryStrategy.EXPRESS, PizzaDeliveryStrategy.NORMAL).contains(timeUnit));
+    }
+    
+    @ParameterizedTest
+    @MethodSource("wordDataProvider")
+    void givenMethodSource_TestInputStream(String argument) {
+        assertNotNull(argument);
+    }
+
+    static Stream<String> wordDataProvider() {
+        return Stream.of("foo", "bar");
+    }
+    
+    @ParameterizedTest
+    @CsvSource({ "1, Car", "2, House", "3, Train" })
+    void givenCSVSource_TestContent(int id, String word) {
+        assertNotNull(id);
+        assertNotNull(word);
+    }
+}

testing-modules/junit-5/src/test/java/com/baeldung/junit5vstestng/PizzaDeliveryStrategy.java

@@ -0,0 +1,6 @@
+package com.baeldung.junit5vstestng;
+
+public enum PizzaDeliveryStrategy {
+    EXPRESS,
+    NORMAL;
+}

testing-modules/junit-5/src/test/java/com/baeldung/junit5vstestng/SelectClassesSuiteUnitTest.java

@@ -0,0 +1,11 @@
+package com.baeldung.junit5vstestng;
+
+import org.junit.platform.runner.JUnitPlatform;
+import org.junit.platform.suite.api.SelectClasses;
+import org.junit.runner.RunWith;
+
+@RunWith(JUnitPlatform.class)
+@SelectClasses({Class1UnitTest.class, Class2UnitTest.class})
+public class SelectClassesSuiteUnitTest {
+
+}

testing-modules/junit-5/src/test/java/com/baeldung/junit5vstestng/SelectPackagesSuiteUnitTest.java

@@ -0,0 +1,11 @@
+package com.baeldung.junit5vstestng;
+
+import org.junit.platform.runner.JUnitPlatform;
+import org.junit.platform.suite.api.SelectPackages;
+import org.junit.runner.RunWith;
+
+@RunWith(JUnitPlatform.class)
+@SelectPackages({ "org.baeldung.java.suite.childpackage1", "org.baeldung.java.suite.childpackage2" })
+public class SelectPackagesSuiteUnitTest {
+
+}

testing-modules/junit-5/src/test/java/com/baeldung/junit5vstestng/SummationServiceUnitTest.java

@@ -0,0 +1,53 @@
+package com.baeldung.junit5vstestng;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.junit.Assert;
+import org.junit.Ignore;
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+public class SummationServiceUnitTest {
+    private static List<Integer> numbers;
+
+    @BeforeAll
+    public static void initialize() {
+        numbers = new ArrayList<>();
+    }
+ 
+    @AfterAll
+    public static void tearDown() {
+        numbers = null;
+    }
+ 
+    @BeforeEach
+    public void runBeforeEachTest() {
+        numbers.add(1);
+        numbers.add(2);
+        numbers.add(3);
+    }
+ 
+    @AfterEach
+    public void runAfterEachTest() {
+        numbers.clear();
+    }
+ 
+    @Test
+    public void givenNumbers_sumEquals_thenCorrect() {
+        int sum = numbers.stream()
+            .reduce(0, Integer::sum);
+        Assert.assertEquals(6, sum);
+    }
+
+    @Ignore
+    @Test
+    public void givenEmptyList_sumEqualsZero_thenCorrect() {
+        int sum = numbers.stream()
+            .reduce(0, Integer::sum);
+        Assert.assertEquals(6, sum);
+    }
+}

testing-modules/junit-5/src/test/java/com/baeldung/methodorders/DefaultOrderOfExecutionUnitTest.java

@@ -0,0 +1,33 @@
+package com.baeldung.methodorders;
+
+import static org.junit.Assert.assertEquals;
+
+import org.junit.AfterClass;
+import org.junit.FixMethodOrder;
+import org.junit.Test;
+import org.junit.runners.MethodSorters;
+
+@FixMethodOrder(MethodSorters.DEFAULT)
+public class DefaultOrderOfExecutionUnitTest {
+    private static StringBuilder output = new StringBuilder("");
+
+    @Test
+    public void secondTest() {
+        output.append("b");
+    }
+
+    @Test
+    public void thirdTest() {
+        output.append("c");
+    }
+
+    @Test
+    public void firstTest() {
+        output.append("a");
+    }
+
+    @AfterClass
+    public static void assertOutput() {
+        assertEquals(output.toString(), "cab");
+    }
+}

testing-modules/junit-5/src/test/java/com/baeldung/methodorders/JVMOrderOfExecutionUnitTest.java

@@ -0,0 +1,26 @@
+package com.baeldung.methodorders;
+
+import org.junit.FixMethodOrder;
+import org.junit.Test;
+import org.junit.runners.MethodSorters;
+
+@FixMethodOrder(MethodSorters.JVM)
+public class JVMOrderOfExecutionUnitTest {
+
+    private static StringBuilder output = new StringBuilder("");
+
+    @Test
+    public void secondTest() {
+        output.append("b");
+    }
+
+    @Test
+    public void thirdTest() {
+        output.append("c");
+    }
+
+    @Test
+    public void firstTest() {
+        output.append("a");
+    }
+}

testing-modules/junit-5/src/test/java/com/baeldung/methodorders/NameAscendingOrderOfExecutionUnitTest.java

@@ -0,0 +1,33 @@
+package com.baeldung.methodorders;
+
+import static org.junit.Assert.assertEquals;
+
+import org.junit.AfterClass;
+import org.junit.FixMethodOrder;
+import org.junit.Test;
+import org.junit.runners.MethodSorters;
+
+@FixMethodOrder(MethodSorters.NAME_ASCENDING)
+public class NameAscendingOrderOfExecutionUnitTest {
+    private static StringBuilder output = new StringBuilder("");
+
+    @Test
+    public void secondTest() {
+        output.append("b");
+    }
+
+    @Test
+    public void thirdTest() {
+        output.append("c");
+    }
+
+    @Test
+    public void firstTest() {
+        output.append("a");
+    }
+
+    @AfterClass
+    public static void assertOutput() {
+        assertEquals(output.toString(), "abc");
+    }
+}

testing-modules/junit-5/src/test/java/com/baeldung/param/InvalidPersonParameterResolver.java

@@ -0,0 +1,59 @@
+package com.baeldung.param;
+
+import java.util.Random;
+
+import org.junit.jupiter.api.extension.ExtensionContext;
+import org.junit.jupiter.api.extension.ParameterContext;
+import org.junit.jupiter.api.extension.ParameterResolutionException;
+import org.junit.jupiter.api.extension.ParameterResolver;
+
+public class InvalidPersonParameterResolver implements ParameterResolver {
+
+    /**
+     * The "bad" (invalid) data for testing purposes has to go somewhere, right?
+     */
+    public static Person[] INVALID_PERSONS = { new Person().setId(1L)
+        .setLastName("Ad_ams")
+        .setFirstName("Jill,"),
+            new Person().setId(2L)
+                .setLastName(",Baker")
+                .setFirstName(""),
+            new Person().setId(3L)
+                .setLastName(null)
+                .setFirstName(null),
+            new Person().setId(4L)
+                .setLastName("Daniel&")
+                .setFirstName("{Joseph}"),
+            new Person().setId(5L)
+                .setLastName("")
+                .setFirstName("English, Jane"),
+            new Person()/* .setId(6L).setLastName("Fontana").setFirstName("Enrique") */,
+            // TODO: ADD MORE DATA HERE
+    };
+
+    @Override
+    public Object resolveParameter(ParameterContext parameterContext, ExtensionContext extensionContext) throws ParameterResolutionException {
+        Object ret = null;
+        //
+        // Return a random, valid Person object if Person.class is the type of Parameter
+        /// to be resolved. Otherwise return null.
+        if (parameterContext.getParameter()
+            .getType() == Person.class) {
+            ret = INVALID_PERSONS[new Random().nextInt(INVALID_PERSONS.length)];
+        }
+        return ret;
+    }
+
+    @Override
+    public boolean supportsParameter(ParameterContext parameterContext, ExtensionContext extensionContext) throws ParameterResolutionException {
+        boolean ret = false;
+        //
+        // If the Parameter.type == Person.class, then we support it, otherwise, get outta here!
+        if (parameterContext.getParameter()
+            .getType() == Person.class) {
+            ret = true;
+        }
+        return ret;
+    }
+
+}

testing-modules/junit-5/src/test/java/com/baeldung/param/Person.java

@@ -0,0 +1,43 @@
+package com.baeldung.param;
+
+/**
+ * Very simple Person entity.
+ * Use the Fluent-style interface to set properties.
+ * 
+ * @author J Steven Perry
+ *
+ */
+public class Person {
+
+    private Long id;
+    private String lastName;
+    private String firstName;
+
+    public Long getId() {
+        return id;
+    }
+
+    public Person setId(Long id) {
+        this.id = id;
+        return this;
+    }
+
+    public String getLastName() {
+        return lastName;
+    }
+
+    public Person setLastName(String lastName) {
+        this.lastName = lastName;
+        return this;
+    }
+
+    public String getFirstName() {
+        return firstName;
+    }
+
+    public Person setFirstName(String firstName) {
+        this.firstName = firstName;
+        return this;
+    }
+
+}

testing-modules/junit-5/src/test/java/com/baeldung/param/PersonValidator.java

@@ -0,0 +1,132 @@
+package com.baeldung.param;
+
+import java.util.Arrays;
+
+/**
+ * Somewhat contrived validation class to illustrate unit test
+ * concepts.
+ * 
+ * @author J Steven Perry
+ *
+ */
+public class PersonValidator {
+
+    /**
+     * Contrived checked exception to illustrate one possible
+     * way to handle validation errors (via a checked exception).
+     * 
+     * @author J Steven Perry
+     *
+     */
+    public static class ValidationException extends Exception {
+
+        /**
+         * 
+         */
+        private static final long serialVersionUID = -134518049431883102L;
+
+        // Probably should implement some more constructors, but don't want
+        /// to tarnish the lesson...
+
+        /**
+         * The one and only way to create this checked exception.
+         * 
+         * @param message
+         *          The message accompanying the exception. Should be meaningful.
+         */
+        public ValidationException(String message) {
+            super(message);
+
+        }
+
+    }
+
+    private static final String[] ILLEGAL_NAME_CHARACTERS = { ",", "_", "{", "}", "!" };
+
+    /**
+     * Validate the first name of the specified Person object.
+     * 
+     * @param person
+     *          The Person object to validate.
+     * 
+     * @return - returns true if the specified Person is valid
+     * 
+     * @throws ValidationException
+     *           - this Exception is thrown if any kind of validation error occurs.
+     */
+    public static boolean validateFirstName(Person person) throws ValidationException {
+        boolean ret = true;
+        // The validation rules go here.
+        // Naive: use simple ifs
+        if (person == null) {
+            throw new ValidationException("Person is null (not allowed)!");
+        }
+        if (person.getFirstName() == null) {
+            throw new ValidationException("Person FirstName is null (not allowed)!");
+        }
+        if (person.getFirstName()
+            .isEmpty()) {
+            throw new ValidationException("Person FirstName is an empty String (not allowed)!");
+        }
+        if (!isStringValid(person.getFirstName(), ILLEGAL_NAME_CHARACTERS)) {
+            throw new ValidationException("Person FirstName (" + person.getFirstName() + ") may not contain any of the following characters: " + Arrays.toString(ILLEGAL_NAME_CHARACTERS) + "!");
+        }
+        return ret;
+    }
+
+    /**
+     * Validate the last name of the specified Person object. Looks the same as first
+     * name? Look closer. Just kidding. It's the same. But real world code can (and will) diverge.
+     * 
+     * @param person
+     *          The Person object to validate.
+     * 
+     * @return - returns true if the specified Person is valid
+     * 
+     * @throws ValidationException
+     *           - this Exception is thrown if any kind of validation error occurs.
+     */
+    public static boolean validateLastName(Person person) throws ValidationException {
+        boolean ret = true;
+        // The validation rules go here.
+        // Naive: use simple ifs
+        if (person == null) {
+            throw new ValidationException("Person is null (not allowed)!");
+        }
+        if (person.getFirstName() == null) {
+            throw new ValidationException("Person FirstName is null (not allowed)!");
+        }
+        if (person.getFirstName()
+            .isEmpty()) {
+            throw new ValidationException("Person FirstName is an empty String (not allowed)!");
+        }
+        if (!isStringValid(person.getFirstName(), ILLEGAL_NAME_CHARACTERS)) {
+            throw new ValidationException("Person LastName (" + person.getLastName() + ") may not contain any of the following characters: " + Arrays.toString(ILLEGAL_NAME_CHARACTERS) + "!");
+        }
+        return ret;
+    }
+
+    /**
+     * Validates the specified name. If it contains any of the illegalCharacters,
+     * this method returns false (indicating the name is illegal). Otherwise it returns true.
+     * 
+     * @param candidate
+     *          The candidate String to validate
+     * 
+     * @param illegalCharacters
+     *          The characters the String is not allowed to have
+     * 
+     * @return - boolean - true if the name is valid, false otherwise.
+     */
+    private static boolean isStringValid(String candidate, String[] illegalCharacters) {
+        boolean ret = true;
+        for (String illegalChar : illegalCharacters) {
+            if (candidate.contains(illegalChar)) {
+                ret = false;
+                break;
+            }
+        }
+        return ret;
+    }
+
+}

testing-modules/junit-5/src/test/java/com/baeldung/param/PersonValidatorUnitTest.java

@@ -0,0 +1,102 @@
+package com.baeldung.param;
+
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.junit.jupiter.api.Assertions.fail;
+
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Nested;
+import org.junit.jupiter.api.RepeatedTest;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.junit.platform.runner.JUnitPlatform;
+import org.junit.runner.RunWith;
+
+@RunWith(JUnitPlatform.class)
+@DisplayName("Testing PersonValidator")
+public class PersonValidatorUnitTest {
+
+    /**
+     * Nested class, uses ExtendWith
+     * {@link com.baeldung.param.ValidPersonParameterResolver ValidPersonParameterResolver}
+     * to feed Test methods with "good" data.
+     */
+    @Nested
+    @DisplayName("When using Valid data")
+    @ExtendWith(ValidPersonParameterResolver.class)
+    public class ValidData {
+
+        /**
+         * Repeat the test ten times, that way we have a good shot at
+         * running all of the data through at least once.
+         * 
+         * @param person
+         *          A valid Person object to validate.
+         */
+        @RepeatedTest(value = 10)
+        @DisplayName("All first names are valid")
+        public void validateFirstName(Person person) {
+            try {
+                assertTrue(PersonValidator.validateFirstName(person));
+            } catch (PersonValidator.ValidationException e) {
+                fail("Exception not expected: " + e.getLocalizedMessage());
+            }
+        }
+
+        /**
+         * Repeat the test ten times, that way we have a good shot at
+         * running all of the data through at least once.
+         * 
+         * @param person
+         *          A valid Person object to validate.
+         */
+        @RepeatedTest(value = 10)
+        @DisplayName("All last names are valid")
+        public void validateLastName(Person person) {
+            try {
+                assertTrue(PersonValidator.validateLastName(person));
+            } catch (PersonValidator.ValidationException e) {
+                fail("Exception not expected: " + e.getLocalizedMessage());
+            }
+        }
+
+    }
+
+    /**
+     * Nested class, uses ExtendWith
+     * {@link com.baeldung.param.InvalidPersonParameterResolver InvalidPersonParameterResolver}
+     * to feed Test methods with "bad" data.
+     */
+    @Nested
+    @DisplayName("When using Invalid data")
+    @ExtendWith(InvalidPersonParameterResolver.class)
+    public class InvalidData {
+
+        /**
+         * Repeat the test ten times, that way we have a good shot at
+         * running all of the data through at least once.
+         * 
+         * @param person
+         *          An invalid Person object to validate.
+         */
+        @RepeatedTest(value = 10)
+        @DisplayName("All first names are invalid")
+        public void validateFirstName(Person person) {
+            assertThrows(PersonValidator.ValidationException.class, () -> PersonValidator.validateFirstName(person));
+        }
+
+        /**
+         * Repeat the test ten times, that way we have a good shot at
+         * running all of the data through at least once.
+         * 
+         * @param person
+         *          An invalid Person object to validate.
+         */
+        @RepeatedTest(value = 10)
+        @DisplayName("All first names are invalid")
+        public void validateLastName(Person person) {
+            assertThrows(PersonValidator.ValidationException.class, () -> PersonValidator.validateLastName(person));
+        }
+
+    }
+
+}

testing-modules/junit-5/src/test/java/com/baeldung/param/ValidPersonParameterResolver.java

@@ -0,0 +1,61 @@
+package com.baeldung.param;
+
+import java.util.Random;
+
+import org.junit.jupiter.api.extension.ExtensionContext;
+import org.junit.jupiter.api.extension.ParameterContext;
+import org.junit.jupiter.api.extension.ParameterResolutionException;
+import org.junit.jupiter.api.extension.ParameterResolver;
+
+public class ValidPersonParameterResolver implements ParameterResolver {
+
+    /**
+     * The "good" (valid) data for testing purposes has to go somewhere, right?
+     */
+    public static Person[] VALID_PERSONS = { new Person().setId(1L)
+        .setLastName("Adams")
+        .setFirstName("Jill"),
+            new Person().setId(2L)
+                .setLastName("Baker")
+                .setFirstName("James"),
+            new Person().setId(3L)
+                .setLastName("Carter")
+                .setFirstName("Samanta"),
+            new Person().setId(4L)
+                .setLastName("Daniels")
+                .setFirstName("Joseph"),
+            new Person().setId(5L)
+                .setLastName("English")
+                .setFirstName("Jane"),
+            new Person().setId(6L)
+                .setLastName("Fontana")
+                .setFirstName("Enrique"),
+            // TODO: ADD MORE DATA HERE
+    };
+
+    @Override
+    public Object resolveParameter(ParameterContext parameterContext, ExtensionContext extensionContext) throws ParameterResolutionException {
+        Object ret = null;
+        //
+        // Return a random, valid Person object if Person.class is the type of Parameter
+        /// to be resolved. Otherwise return null.
+        if (parameterContext.getParameter()
+            .getType() == Person.class) {
+            ret = VALID_PERSONS[new Random().nextInt(VALID_PERSONS.length)];
+        }
+        return ret;
+    }
+
+    @Override
+    public boolean supportsParameter(ParameterContext parameterContext, ExtensionContext extensionContext) throws ParameterResolutionException {
+        boolean ret = false;
+        //
+        // If the Parameter.type == Person.class, then we support it, otherwise, get outta here!
+        if (parameterContext.getParameter()
+            .getType() == Person.class) {
+            ret = true;
+        }
+        return ret;
+    }
+
+}

testing-modules/junit-5/src/test/java/com/baeldung/parameterized/BlankStringsArgumentsProvider.java

@@ -0,0 +1,19 @@
+package com.baeldung.parameterized;
+
+import org.junit.jupiter.api.extension.ExtensionContext;
+import org.junit.jupiter.params.provider.Arguments;
+import org.junit.jupiter.params.provider.ArgumentsProvider;
+
+import java.util.stream.Stream;
+
+class BlankStringsArgumentsProvider implements ArgumentsProvider {
+
+    @Override
+    public Stream<? extends Arguments> provideArguments(ExtensionContext context) {
+        return Stream.of(
+                Arguments.of((String) null),
+                Arguments.of(""),
+                Arguments.of("   ")
+        );
+    }
+}

testing-modules/junit-5/src/test/java/com/baeldung/parameterized/EnumsUnitTest.java

@@ -0,0 +1,50 @@
+package com.baeldung.parameterized;
+
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.CsvSource;
+import org.junit.jupiter.params.provider.EnumSource;
+
+import java.time.Month;
+import java.util.EnumSet;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+class EnumsUnitTest {
+
+    @ParameterizedTest
+    @EnumSource(Month.class)
+    void getValueForAMonth_IsAlwaysBetweenOneAndTwelve(Month month) {
+        int monthNumber = month.getValue();
+        assertTrue(monthNumber >= 1 && monthNumber <= 12);
+    }
+
+    @ParameterizedTest(name = "{index} {0} is 30 days long")
+    @EnumSource(value = Month.class, names = {"APRIL", "JUNE", "SEPTEMBER", "NOVEMBER"})
+    void someMonths_Are30DaysLong(Month month) {
+        final boolean isALeapYear = false;
+        assertEquals(30, month.length(isALeapYear));
+    }
+
+    @ParameterizedTest
+    @EnumSource(value = Month.class, names = {"APRIL", "JUNE", "SEPTEMBER", "NOVEMBER", "FEBRUARY"}, mode = EnumSource.Mode.EXCLUDE)
+    void exceptFourMonths_OthersAre31DaysLong(Month month) {
+        final boolean isALeapYear = false;
+        assertEquals(31, month.length(isALeapYear));
+    }
+
+    @ParameterizedTest
+    @EnumSource(value = Month.class, names = ".+BER", mode = EnumSource.Mode.MATCH_ANY)
+    void fourMonths_AreEndingWithBer(Month month) {
+        EnumSet<Month> months = EnumSet.of(Month.SEPTEMBER, Month.OCTOBER, Month.NOVEMBER, Month.DECEMBER);
+        assertTrue(months.contains(month));
+    }
+
+    @ParameterizedTest
+    @CsvSource({"APRIL", "JUNE", "SEPTEMBER", "NOVEMBER"})
+    void someMonths_Are30DaysLongCsv(Month month) {
+        final boolean isALeapYear = false;
+        assertEquals(30, month.length(isALeapYear));
+    }
+    
+}

testing-modules/junit-5/src/test/java/com/baeldung/parameterized/LocalDateUnitTest.java

@@ -0,0 +1,18 @@
+package com.baeldung.parameterized;
+
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.converter.ConvertWith;
+import org.junit.jupiter.params.provider.CsvSource;
+
+import java.time.LocalDate;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+class LocalDateUnitTest {
+
+    @ParameterizedTest
+    @CsvSource({"2018/12/25,2018", "2019/02/11,2019"})
+    void getYear_ShouldWorkAsExpected(@ConvertWith(SlashyDateConverter.class) LocalDate date, int expected) {
+        assertEquals(expected, date.getYear());
+    }
+}

testing-modules/junit-5/src/test/java/com/baeldung/parameterized/Numbers.java

@@ -0,0 +1,8 @@
+package com.baeldung.parameterized;
+
+public class Numbers {
+
+    public static boolean isOdd(int number) {
+        return number % 2 != 0;
+    }
+}

testing-modules/junit-5/src/test/java/com/baeldung/parameterized/NumbersUnitTest.java

@@ -0,0 +1,15 @@
+package com.baeldung.parameterized;
+
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.ValueSource;
+
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+class NumbersUnitTest {
+
+    @ParameterizedTest
+    @ValueSource(ints = {1, 3, 5, -3, 15, Integer.MAX_VALUE})
+    void isOdd_ShouldReturnTrueForOddNumbers(int number) {
+        assertTrue(Numbers.isOdd(number));
+    }
+}

testing-modules/junit-5/src/test/java/com/baeldung/parameterized/Person.java

@@ -0,0 +1,20 @@
+package com.baeldung.parameterized;
+
+class Person {
+
+    private final String firstName;
+    private final String middleName;
+    private final String lastName;
+
+    public Person(String firstName, String middleName, String lastName) {
+        this.firstName = firstName;
+        this.middleName = middleName;
+        this.lastName = lastName;
+    }
+
+    public String fullName() {
+        if (middleName == null || middleName.trim().isEmpty()) return String.format("%s %s", firstName, lastName);
+
+        return String.format("%s %s %s", firstName, middleName, lastName);
+    }
+}

testing-modules/junit-5/src/test/java/com/baeldung/parameterized/PersonAggregator.java

@@ -0,0 +1,15 @@
+package com.baeldung.parameterized;
+
+import org.junit.jupiter.api.extension.ParameterContext;
+import org.junit.jupiter.params.aggregator.ArgumentsAccessor;
+import org.junit.jupiter.params.aggregator.ArgumentsAggregationException;
+import org.junit.jupiter.params.aggregator.ArgumentsAggregator;
+
+class PersonAggregator implements ArgumentsAggregator {
+
+    @Override
+    public Object aggregateArguments(ArgumentsAccessor accessor, ParameterContext context)
+            throws ArgumentsAggregationException {
+        return new Person(accessor.getString(1), accessor.getString(2), accessor.getString(3));
+    }
+}

testing-modules/junit-5/src/test/java/com/baeldung/parameterized/PersonUnitTest.java

@@ -0,0 +1,31 @@
+package com.baeldung.parameterized;
+
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.aggregator.AggregateWith;
+import org.junit.jupiter.params.aggregator.ArgumentsAccessor;
+import org.junit.jupiter.params.provider.CsvSource;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+class PersonUnitTest {
+
+    @ParameterizedTest
+    @CsvSource({"Isaac,,Newton, Isaac Newton", "Charles,Robert,Darwin,Charles Robert Darwin"})
+    void fullName_ShouldGenerateTheExpectedFullName(ArgumentsAccessor argumentsAccessor) {
+        String firstName = argumentsAccessor.getString(0);
+        String middleName = (String) argumentsAccessor.get(1);
+        String lastName = argumentsAccessor.get(2, String.class);
+        String expectedFullName = argumentsAccessor.getString(3);
+
+        Person person = new Person(firstName, middleName, lastName);
+        assertEquals(expectedFullName, person.fullName());
+    }
+
+    @ParameterizedTest
+    @CsvSource({"Isaac Newton,Isaac,,Newton", "Charles Robert Darwin,Charles,Robert,Darwin"})
+    void fullName_ShouldGenerateTheExpectedFullName(String expectedFullName,
+                                                    @AggregateWith(PersonAggregator.class) Person person) {
+
+        assertEquals(expectedFullName, person.fullName());
+    }
+}

testing-modules/junit-5/src/test/java/com/baeldung/parameterized/SlashyDateConverter.java

@@ -0,0 +1,27 @@
+package com.baeldung.parameterized;
+
+import org.junit.jupiter.api.extension.ParameterContext;
+import org.junit.jupiter.params.converter.ArgumentConversionException;
+import org.junit.jupiter.params.converter.ArgumentConverter;
+
+import java.time.LocalDate;
+
+class SlashyDateConverter implements ArgumentConverter {
+
+    @Override
+    public Object convert(Object source, ParameterContext context) throws ArgumentConversionException {
+        if (!(source instanceof String))
+            throw new IllegalArgumentException("The argument should be a string: " + source);
+
+        try {
+            String[] parts = ((String) source).split("/");
+            int year = Integer.parseInt(parts[0]);
+            int month = Integer.parseInt(parts[1]);
+            int day = Integer.parseInt(parts[2]);
+
+            return LocalDate.of(year, month, day);
+        } catch (Exception e) {
+            throw new IllegalArgumentException("Failed to convert", e);
+        }
+    }
+}

testing-modules/junit-5/src/test/java/com/baeldung/parameterized/StringParams.java

@@ -0,0 +1,10 @@
+package com.baeldung.parameterized;
+
+import java.util.stream.Stream;
+
+public class StringParams {
+
+    static Stream<String> blankStrings() {
+        return Stream.of(null, "", "  ");
+    }
+}

testing-modules/junit-5/src/test/java/com/baeldung/parameterized/Strings.java

@@ -0,0 +1,8 @@
+package com.baeldung.parameterized;
+
+class Strings {
+
+    static boolean isBlank(String input) {
+        return input == null || input.trim().isEmpty();
+    }
+}

testing-modules/junit-5/src/test/java/com/baeldung/parameterized/StringsUnitTest.java

@@ -0,0 +1,131 @@
+package com.baeldung.parameterized;
+
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.*;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.stream.Stream;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+class StringsUnitTest {
+
+    static Stream<Arguments> arguments = Stream.of(
+            Arguments.of(null, true), // null strings should be considered blank
+            Arguments.of("", true),
+            Arguments.of("  ", true),
+            Arguments.of("not blank", false)
+    );
+
+    @ParameterizedTest
+    @VariableSource("arguments")
+    void isBlank_ShouldReturnTrueForNullOrBlankStringsVariableSource(String input, boolean expected) {
+        assertEquals(expected, Strings.isBlank(input));
+    }
+
+    @ParameterizedTest
+    @ValueSource(strings = {"", "  "})
+    void isBlank_ShouldReturnTrueForNullOrBlankStrings(String input) {
+        assertTrue(Strings.isBlank(input));
+    }
+
+    @ParameterizedTest
+    @MethodSource("provideStringsForIsBlank")
+    void isBlank_ShouldReturnTrueForNullOrBlankStrings(String input, boolean expected) {
+        assertEquals(expected, Strings.isBlank(input));
+    }
+
+    @ParameterizedTest
+    @MethodSource // Please note method name is not provided
+    void isBlank_ShouldReturnTrueForNullOrBlankStringsOneArgument(String input) {
+        assertTrue(Strings.isBlank(input));
+    }
+
+    @ParameterizedTest
+    @MethodSource("com.baeldung.parameterized.StringParams#blankStrings")
+    void isBlank_ShouldReturnTrueForNullOrBlankStringsExternalSource(String input) {
+        assertTrue(Strings.isBlank(input));
+    }
+
+    @ParameterizedTest
+    @ArgumentsSource(BlankStringsArgumentsProvider.class)
+    void isBlank_ShouldReturnTrueForNullOrBlankStringsArgProvider(String input) {
+        assertTrue(Strings.isBlank(input));
+    }
+
+    private static Stream<String> isBlank_ShouldReturnTrueForNullOrBlankStringsOneArgument() {
+        return Stream.of(null, "", "  ");
+    }
+
+    @ParameterizedTest
+    @MethodSource("provideStringsForIsBlankList")
+    void isBlank_ShouldReturnTrueForNullOrBlankStringsList(String input, boolean expected) {
+        assertEquals(expected, Strings.isBlank(input));
+    }
+
+    @ParameterizedTest
+    @CsvSource({"test,TEST", "tEst,TEST", "Java,JAVA"}) // Passing a CSV pair per test execution
+    void toUpperCase_ShouldGenerateTheExpectedUppercaseValue(String input, String expected) {
+        String actualValue = input.toUpperCase();
+        assertEquals(expected, actualValue);
+    }
+
+    @ParameterizedTest
+    @CsvSource(value = {"test:test", "tEst:test", "Java:java"}, delimiter =':') // Using : as the column separator.
+    void toLowerCase_ShouldGenerateTheExpectedLowercaseValue(String input, String expected) {
+        String actualValue = input.toLowerCase();
+        assertEquals(expected, actualValue);
+    }
+
+    @ParameterizedTest
+    @CsvFileSource(resources = "/data.csv", numLinesToSkip = 1)
+    void toUpperCase_ShouldGenerateTheExpectedUppercaseValueCSVFile(String input, String expected) {
+        String actualValue = input.toUpperCase();
+        assertEquals(expected, actualValue);
+    }
+
+    @ParameterizedTest
+    @NullSource
+    void isBlank_ShouldReturnTrueForNullInputs(String input) {
+        assertTrue(Strings.isBlank(input));
+    }
+
+    @ParameterizedTest
+    @EmptySource
+    void isBlank_ShouldReturnTrueForEmptyStrings(String input) {
+        assertTrue(Strings.isBlank(input));
+    }
+
+    @ParameterizedTest
+    @NullAndEmptySource
+    void isBlank_ShouldReturnTrueForNullAndEmptyStrings(String input) {
+        assertTrue(Strings.isBlank(input));
+    }
+
+    @ParameterizedTest
+    @NullAndEmptySource
+    @ValueSource(strings = {"  ", "\t", "\n"})
+    void isBlank_ShouldReturnTrueForAllTypesOfBlankStrings(String input) {
+        assertTrue(Strings.isBlank(input));
+    }
+
+    private static Stream<Arguments> provideStringsForIsBlank() {
+        return Stream.of(
+                Arguments.of(null, true), // null strings should be considered blank
+                Arguments.of("", true),
+                Arguments.of("  ", true),
+                Arguments.of("not blank", false)
+        );
+    }
+
+    private static List<Arguments> provideStringsForIsBlankList() {
+        return Arrays.asList(
+                Arguments.of(null, true), // null strings should be considered blank
+                Arguments.of("", true),
+                Arguments.of("  ", true),
+                Arguments.of("not blank", false)
+        );
+    }
+}

testing-modules/junit-5/src/test/java/com/baeldung/parameterized/VariableArgumentsProvider.java

@@ -0,0 +1,45 @@
+package com.baeldung.parameterized;
+
+import org.junit.jupiter.api.extension.ExtensionContext;
+import org.junit.jupiter.params.provider.Arguments;
+import org.junit.jupiter.params.provider.ArgumentsProvider;
+import org.junit.jupiter.params.support.AnnotationConsumer;
+
+import java.lang.reflect.Field;
+import java.util.stream.Stream;
+
+class VariableArgumentsProvider implements ArgumentsProvider, AnnotationConsumer<VariableSource> {
+
+    private String variableName;
+
+    @Override
+    public Stream<? extends Arguments> provideArguments(ExtensionContext context) {
+        return context.getTestClass()
+                .map(this::getField)
+                .map(this::getValue)
+                .orElseThrow(() -> new IllegalArgumentException("Failed to load test arguments"));
+    }
+
+    @Override
+    public void accept(VariableSource variableSource) {
+        variableName = variableSource.value();
+    }
+
+    private Field getField(Class<?> clazz) {
+        try {
+            return clazz.getDeclaredField(variableName);
+        } catch (Exception e) {
+            return null;
+        }
+    }
+
+    @SuppressWarnings("unchecked")
+    private Stream<Arguments> getValue(Field field) {
+        Object value = null;
+        try {
+            value = field.get(null);
+        } catch (Exception ignored) {}
+
+        return value == null ? null : (Stream<Arguments>) value;
+    }
+}

testing-modules/junit-5/src/test/java/com/baeldung/parameterized/VariableSource.java

@@ -0,0 +1,19 @@
+package com.baeldung.parameterized;
+
+import org.junit.jupiter.params.provider.ArgumentsSource;
+
+import java.lang.annotation.*;
+
+@Documented
+@Target(ElementType.METHOD)
+@Retention(RetentionPolicy.RUNTIME)
+@ArgumentsSource(VariableArgumentsProvider.class)
+public @interface VariableSource {
+
+    /**
+     * Represents the name of the static variable to load the test arguments from.
+     *
+     * @return Static variable name.
+     */
+    String value();
+}

testing-modules/junit-5/src/test/java/com/baeldung/runfromjava/FirstUnitTest.java

@@ -0,0 +1,24 @@
+package com.baeldung.runfromjava;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+class FirstUnitTest {
+
+    @Test
+    void whenThis_thenThat() {
+        assertTrue(true);
+    }
+
+    @Test
+    void whenSomething_thenSomething() {
+        assertTrue(true);
+    }
+
+    @Test
+    void whenSomethingElse_thenSomethingElse() {
+        assertTrue(true);
+    }
+
+}

testing-modules/junit-5/src/test/java/com/baeldung/runfromjava/RunJUnit5TestsFromJava.java

@@ -0,0 +1,59 @@
+package com.baeldung.runfromjava;
+
+import org.junit.platform.launcher.Launcher;
+import org.junit.platform.launcher.LauncherDiscoveryRequest;
+import org.junit.platform.launcher.TestPlan;
+import org.junit.platform.launcher.core.LauncherDiscoveryRequestBuilder;
+import org.junit.platform.launcher.core.LauncherFactory;
+import org.junit.platform.launcher.listeners.SummaryGeneratingListener;
+import org.junit.platform.launcher.listeners.TestExecutionSummary;
+
+import java.io.PrintWriter;
+
+import static org.junit.platform.engine.discovery.ClassNameFilter.includeClassNamePatterns;
+import static org.junit.platform.engine.discovery.DiscoverySelectors.selectClass;
+import static org.junit.platform.engine.discovery.DiscoverySelectors.selectPackage;
+
+public class RunJUnit5TestsFromJava {
+    SummaryGeneratingListener listener = new SummaryGeneratingListener();
+
+    public void runOne() {
+        LauncherDiscoveryRequest request = LauncherDiscoveryRequestBuilder
+          .request()
+          .selectors(selectClass(FirstUnitTest.class))
+          .build();
+        Launcher launcher = LauncherFactory.create();
+        TestPlan testPlan = launcher.discover(request);
+
+        launcher.registerTestExecutionListeners(listener);
+        launcher.execute(request);
+    }
+
+    public void runAll() {
+        LauncherDiscoveryRequest request = LauncherDiscoveryRequestBuilder
+          .request()
+          .selectors(selectPackage("com.baeldung.runfromjava"))
+          .filters(includeClassNamePatterns(".*Test"))
+          .build();
+        Launcher launcher = LauncherFactory.create();
+
+        TestPlan testPlan = launcher.discover(request);
+
+        launcher.registerTestExecutionListeners(listener);
+
+        launcher.execute(request);
+    }
+
+    public static void main(String[] args) {
+        RunJUnit5TestsFromJava runner = new RunJUnit5TestsFromJava();
+        runner.runAll();
+
+        TestExecutionSummary summary = runner.listener.getSummary();
+        summary.printTo(new PrintWriter(System.out));
+
+        runner.runOne();
+
+        summary = runner.listener.getSummary();
+        summary.printTo(new PrintWriter(System.out));
+    }
+}

testing-modules/junit-5/src/test/java/com/baeldung/runfromjava/SecondUnitTest.java

@@ -0,0 +1,18 @@
+package com.baeldung.runfromjava;
+
+import org.junit.jupiter.api.RepeatedTest;
+
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+class SecondUnitTest {
+
+    @RepeatedTest(10)
+    void whenSomething_thenSomething() {
+        assertTrue(true);
+    }
+
+    @RepeatedTest(5)
+    void whenSomethingElse_thenSomethingElse() {
+        assertTrue(true);
+    }
+}

testing-modules/junit-5/src/test/resources/META-INF/services/org.junit.jupiter.api.extension.Extension

@@ -0,0 +1 @@
+com.baeldung.extensions.EmployeeDaoParameterResolver

testing-modules/junit-5/src/test/resources/com/baeldung/extensions/application.properties

@@ -0,0 +1 @@
+env=dev

testing-modules/junit-5/src/test/resources/com/baeldung/helpers/jdbc.properties

@@ -0,0 +1,5 @@
+#h2 db
+jdbc.driver=org.h2.Driver
+jdbc.url=jdbc:h2:mem:myDb;DB_CLOSE_DELAY=-1
+jdbc.user=sa
+jdbc.password=

testing-modules/junit-5/src/test/resources/data.csv

@@ -0,0 +1,4 @@
+input,expected
+test,TEST
+tEst,TEST
+Java,JAVA