JUnit 5 Fundamentals

Grouping tests with @Tag

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Overview

In this lesson, we are going to look into a meta-annotation used for grouping tests together, @Tag. It's the successor to JUnit 4's Category, and allows developers to tag tests with String identifiers, then later drive the execution of their test suite based on these tags. We'll explore how the Gradle build system can include or exclude specific tests in both Java and Android environments.

Summary

Similar tests may be tagged with the same ID (think "end-to-end tests" vs. "UI tests")
Marking slow-running tests may improve your daily workflow for running tests
Gradle provides a DSL to include and exclude tags
Java: test.useJunitPlatform.include/excludeTags
Android: android.testOptions.junitPlatform.filters.include/excludeTags
Android can specify different include/exclude statements per variant

Instructor

Marcel Schnelle

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Lessons in JUnit 5 Fundamentals

1. Understand the Core Components of JUnit 5

2. Set up your Java Project for JUnit 5

3. Set up your Android Project for JUnit 5

4. The first @Test

5. Lifecycle with @BeforeEach & @AfterEach

6. Lifecycle with @BeforeAll & @AfterAll

7. Using 1 Instance per Method with @TestInstance

8. Using 1 Instance per Class with @TestInstance

9. Taking advantage of @TestInstance(PER_CLASS) in Kotlin

10. Bearable Test Method Names with @DisplayName

11. Checking for equality with assertEquals() & Friends

12. Using assertTrue() & assertFalse()

13. Asserting null

14. Testing Exceptions with assertThrows()

15. Composing Assertions with assertAll()

16. Avoiding failure with Assumptions

17. Ignoring Tests with @Disabled

18. Conditional Test Execution Pairs: @EnabledOnOs & @DisabledOnOs

19. Conditional Test Execution Pairs: @EnabledOnJre & @DisabledOnJre

20. Conditional Test Execution Pairs: @EnabledIfSystemProperty & @DisabledIfSystemProperty

21. Conditional Test Execution Pairs: @EnabledIfEnvironmentVariable & @DisabledIfEnvironmentVariable

22. Conditional Test Execution Pairs: @EnabledIf & @DisabledIf

23. Grouping tests with @Tag

24. @Nested & Effective BDD in JUnit 5

25. Running a test multiple times with @RepeatedTest

26. @ParameterizedTest with @ValueSource

27. @ParameterizedTest with @EnumSource

28. @ParameterizedTest with @MethodSource

29. @ParameterizedTest with @CsvSource & @CsvFileSource

30. Argument Conversion Techniques for Parameterized Tests

31. Writing a custom @Source for Parameterized Tests

32. Introduction to @TestFactory and Dynamic Tests

33. Grouping Dynamic Tests into Containers

34. Lifecycle Caveats for Dynamic Tests

35. Setting up Parallel Test Execution

36. Parallel Execution Strategies: Dynamic

37. Parallel Execution Strategies: Fixed

38. Parallel Execution Strategies: Custom

39. Synchronizing Parallel Test Execution with @ResourceLock