Code examples for - Parameterized tests with JUnit 5

core-java/junit5-parameterized-tests/src/test/java/source/assertj/AssertJTest.java

@@ -11,18 +11,17 @@ import org.junit.jupiter.params.provider.MethodSource;
 public class AssertJTest {
 
 	@ParameterizedTest
-	@MethodSource("checkNumber_args")
+	@MethodSource("checkNumberArgs")
 	void checkNumber(int number, Consumer<Integer> consumer) {
 
 		consumer.accept(number);
 	}
 
-	static Stream<Arguments> checkNumber_args() {
+	static Stream<Arguments> checkNumberArgs() {
 
 		Consumer<Integer> evenConsumer = i -> Assertions.assertThat(i % 2).isZero();
 		Consumer<Integer> oddConsumer = i -> Assertions.assertThat(i % 2).isEqualTo(1);
 
-		return Stream.of(Arguments.of(2, evenConsumer), 
+		return Stream.of(Arguments.of(2, evenConsumer), Arguments.of(3, oddConsumer));
-						 Arguments.of(3, oddConsumer));
 	}
 }

core-java/junit5-parameterized-tests/src/test/java/source/csv/file/CsvFileSourceTest.java

@@ -13,4 +13,15 @@ public class CsvFileSourceTest {
 	void checkCsvFileSource(int number, String expected) {
 		assertEquals(StringUtils.equals(expected, "even") ? 0 : 1, number % 2);
 	}
+
+	// ---------------------------------------------------------------------------
+
+	@ParameterizedTest
+	@CsvFileSource(files = "src/test/resources/csv-file-source_attributes.csv", 
+				   delimiterString = "|",
+				   lineSeparator = "||",
+				   numLinesToSkip = 1)
+	void checkCsvFileSourceAttributes(int number, String expected) {
+		assertEquals(StringUtils.equals(expected, "even") ? 0 : 1, number % 2);
+	}
 }

core-java/junit5-parameterized-tests/src/test/java/source/method/ExternalMethodSource.java

@@ -4,7 +4,7 @@ import java.util.stream.Stream;
 
 public class ExternalMethodSource {
 
-	static Stream<String> checkExternalMethodSource_args() {
+	static Stream<String> checkExternalMethodSourceArgs() {
 		return Stream.of("a1", "b2");
 	}
 

core-java/junit5-parameterized-tests/src/test/java/source/method/ExternalMethodSourceTest.java

@@ -10,7 +10,7 @@ public class ExternalMethodSourceTest {
 
 	// Note: The test will try to load the external method
 	@ParameterizedTest
-	@MethodSource("source.method.ExternalMethodSource#checkExternalMethodSource_args")
+	@MethodSource("source.method.ExternalMethodSource#checkExternalMethodSourceArgs")
 	void checkExternalMethodSource(String word) {
 		assertTrue(StringUtils.isAlphanumeric(word), "Supplied word is not alpha-numeric");
 	}

core-java/junit5-parameterized-tests/src/test/java/source/method/MethodSourceTest.java

@@ -14,12 +14,12 @@ public class MethodSourceTest {
 
 	// Note: The test will try to load the supplied method
 	@ParameterizedTest
-	@MethodSource("checkExplicitMethodSource_args")
+	@MethodSource("checkExplicitMethodSourceArgs")
 	void checkExplicitMethodSource(String word) {
 		assertTrue(StringUtils.isAlphanumeric(word), "Supplied word is not alpha-numeric");
 	}
 
-	static Stream<String> checkExplicitMethodSource_args() {
+	static Stream<String> checkExplicitMethodSourceArgs() {
 		return Stream.of("a1", "b2");
 	}
 

core-java/junit5-parameterized-tests/src/test/resources/csv-file-source_attributes.csv

@@ -0,0 +1,3 @@
+|| NUMBER | ODD_EVEN ||
+|| 2 	  | even     ||
+|| 3 	  | odd	     ||