Test Interfaces and Default Methods in JUnit 5

By | October 3, 2020

JUnit Jupiter allows @Test, @RepeatedTest, @ParameterizedTest, @TestFactory, @TestTemplate, @BeforeEach, and @AfterEach to be declared on interface default methods.

 @BeforeAll and @AfterAll can either be declared on static methods in a test interface or on interface default methods if the test interface or test class is annotated with @TestInstance(Lifecycle.PER_CLASS)

@ExtendWith and @Tag can be declared on a test interface so that classes that implement the interface automatically inherit its tags and extensions.

Finally, In your test class, you can implement these test interfaces to have them applied.

Let’s try to understand the above concept using a demo project:

pom.xml

LifecycleLoggerTest.java

InterfaceDynamicTestsDemo.java

The output of the above project:

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That’s all about Test Interfaces and Default Methods in JUnit 5
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