junit5

JUnit test class order

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In JUnit 5 (from version 5.8.0 onwards) test classes can be ordered too. src/test/resources/junit-platform.properties: # ClassOrderer$OrderAnnotation sorts classes based on their @Order annotation junit.jupiter.testclass.order.default=org.junit.jupiter.api.ClassOrderer$OrderAnnotation Other Junit built-in class orderer implementations: org.junit.jupiter.api.ClassOrderer$ClassName org.junit.jupiter.api.ClassOrderer$DisplayName org.junit.jupiter.api.ClassOrderer$Random For other ways to set configuration parameters (beside junit-platform.properties file) see JUnit 5 user guide. You can also provide your own orderer. … Read more

JUnit’s @TestMethodOrder annotation not working

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You need to configure correctly your IDE. Requirements <dependency> <groupId>org.junit.jupiter</groupId> <artifactId>junit-jupiter-engine</artifactId> <version>5.4.0</version> </dependency> Do not use JUnit 5 that offers your IDE. If you add it as library, you will get: No tests found for with test runner ‘JUnit 5’ ==================== and this exception =================== TestEngine with ID ‘junit-vintage’ failed to discover tests java.lang.SecurityException: class … Read more

Junit 5 – How to pass in multiple null values for @CsvSource?

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@CsvSource has an attribute called nullValues. See the documentation. A list of strings that should be interpreted as null references. @CsvSource(value= {“null, null”, “foo, bar”} , nullValues={“null”}) The other option is to simply don’t pass any value as stated in the previously linked documentation. Please note that unquoted empty values will always be converted to … Read more

Why JUnit 5 default access modifier changed to package-private

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Why is the default access modifier in JUnit 5 package-private? It’s not the “default”. There technically is no default. Rather, in JUnit Jupiter you have a choice: public, protected or package-private. What is the benefit of changing it to package-private? The benefit is that you don’t have type public anymore. If your IDE automatically generates … Read more

JUnit 5 @MethodSource in nested class

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@TestInstance(PER_CLASS) You may select the “single test instance per class” mode annotating the nested class with @TestInstance(TestInstance.Lifecycle.PER_CLASS): class ColorTest { @Nested @TestInstance(TestInstance.Lifecycle.PER_CLASS) class Inner { @ParameterizedTest @MethodSource(“colors”) void blue(Color color, int blue) { Assertions.assertEquals(color.getBlue(), blue); } Stream<Arguments> colors() { return Stream.of( Arguments.of(Color.BLACK, 0), Arguments.of(Color.GRAY, 128), Arguments.of(Color.BLUE, 255) ); } } } When using this mode, … Read more

How to use Mockito with JUnit 5?

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There are different ways to use Mockito – I’ll go through them one by one. Manually Creating mocks manually with Mockito::mock works regardless of the JUnit version (or test framework for that matter). Annotation Based Using the @Mock-annotation and the corresponding call to MockitoAnnotations::initMocks to create mocks works regardless of the JUnit version (or test … Read more

What is the difference between @ExtendWith(SpringExtension.class) and @ExtendWith(MockitoExtension.class)?

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When involving Spring: If you want to use Spring test framework features in your tests like for example @MockBean, then you have to use @ExtendWith(SpringExtension.class). It replaces the deprecated JUnit4 @RunWith(SpringJUnit4ClassRunner.class) When NOT involving Spring: If you just want to involve Mockito and don’t have to involve Spring, for example, when you just want to … Read more