BAEL 1861 (#4913)

* BAEL-1861 Replaced real tests with demo test "placeholders"

* BAEL-1861 Moved code from new module into existing ones

* BAEL-1861 Renamed main() classes to not violate PMD rules

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);
+    }
+}