JUnit 6.0

Thanks to the Sovereign Tech Fund I had the opportunity to work full-time on JUnit in 2025 and 2026. In this lightning talk, I will talk about my experience and will shortly introduce new features and improvements. Among them are Open Test Reporting, parameterized test classes, and discovery issues.

Transcript

1. JUnit 6.0 1
2. Marc Philipp 2
3. JUnit in a nutshell • • • • • 3
4. Thank you to our sponsors! 4
5. The Sovereign Tech Fund is investing in JUnit in 2024 and 2025! 5
6. Sovereign Tech Fund • • 6
7. JUnit Generations 7
8. JUnit Generations 7.1
9. JUnit Generations 7.2
10. JUnit Generations 7.3
11. Full-time work on JUnit (2024-2025) 8
12. Full-time work on JUnit (2024-2025) • 8.1
13. Full-time work on JUnit (2024-2025) • • 8.2
14. Full-time work on JUnit (2024-2025) • • • 8.3
15. Full-time work on JUnit (2024-2025) • • • • 8.4
16. Full-time work on JUnit (2024-2025) • • • • • 8.5
17. Full-time work on JUnit (2024-2025) • • • • • • 8.6
18. Full-time work on JUnit (2024-2025) • • • • • • • 8.7
19. More info • • 9
20. Better Test Reports 10
21. Open Test Reporting XML format • • junit-platform- reporting • junit.platform.reporting.open.xml.enabled=true 11
22. HTML Report • • 12
23. HTML Report 13
24. HTML Report 14
25. Future work • • • 15
26. Parameterized Test Classes 16
27. Parameterized Test Methods • @ParameterizedTest • @���Source class SomeTests { @ParameterizedTest @ValueSource(strings = {"foo", "bar"}) void shouldNotBeNull(String value) { assertNotNull(value); } @ParameterizedTest @ValueSource(strings = {"foo", "bar"}) void lengthShouldBeThree() { assertEquals(3, value.length()); } } 17
28. Parameterized Test Classes • @ParameterizedClass • @���Source @ParameterizedClass @ValueSource(strings = {"foo", "bar"}) class SomeTests { @Parameter String value; @Test void shouldNotBeNull() { assertNotNull(value); } @Test void lengthShouldBeThree() { assertEquals(3, value.length()); } } 18
29. Consuming Arguments • • @ParameterizedClass @ValueSource(strings = {"foo", "bar"}) record SomeTests(String value) { @Test void shouldNotBeNull() { assertNotNull(value); } @Test void lengthShouldBeThree() { assertEquals(3, value.length()); } } 19
30. Discovery Issues 20
31. Discovery issues? 21
32. Valid test methods? @Test �� Java int test() { return 42; } @Test �� Kotlin fun test(): Nothing = fail() 22
33. Valid test methods? @Test �� Java int test() { return 42; } @Test �� Kotlin fun test(): Nothing = fail() @Test void Unit 22.1
34. Discovery issue reporting • • • • junit.platform.discovery.issue.severity.critical 23
35. Discovery issue reporting 24
36. JUnit 6.0 25
37. Overview of 6.0 • ▪ ▪ • 26
38. Major changes in 6.0 • 27
39. Major changes in 6.0 • • 27.1
40. Major changes in 6.0 • • • 27.2
41. Major changes in 6.0 • • • • @Nullable 27.3
42. Major changes in 6.0 • • • • @Nullable • 27.4
43. Major changes in 6.0 • • • • @Nullable • ▪ 27.5
44. Major changes in 6.0 • • • • @Nullable • ▪ • 27.6
45. Long(er)-Term Support for 5.14.x • • 28
46. Spring Framework 7.0 and Spring Boot 4.0 will be based on JUnit 6.0 29
47. Thanks! 30