Comparisons
JUnit vs TestNG: Which Should You Use?
Both are mature, widely-used Java testing frameworks -- the choice usually comes down to ecosystem fit and specific feature needs, not one being clearly superior.
Side-by-Side Comparison
| JUnit (5) | TestNG |
|---|---|
| The default choice in most Spring Boot projects | Common in QA automation and Selenium-based test suites |
| @Test, @BeforeEach, @AfterEach annotations | @Test, @BeforeMethod, @AfterMethod annotations |
| Parameterized tests via @ParameterizedTest | Built-in data providers (@DataProvider) for parameterized tests |
| Test grouping via tags | More flexible built-in test grouping and dependency ordering |
| Tightly integrated with Spring Boot's testing support | Popular default in many Selenium/API automation frameworks |
Which Should You Use?
For a Spring Boot backend project, JUnit 5 is the natural default -- it's what Spring Boot's testing starter integrates with out of the box. For a QA automation role specifically (Selenium/API test suites), TestNG's built-in data providers and more flexible test dependency/grouping features make it a very common choice, though modern JUnit 5 has closed much of that gap. If you're job-hunting, check what your target companies' existing codebases and job descriptions actually mention, since switching later is a real but manageable effort.
Frequently Asked Questions
Technically possible with the right build configuration, but it adds real complexity and confusion for little benefit -- most teams pick one and standardize on it for consistency across the codebase.
Both support it -- TestNG has historically had more mature, flexible built-in parallel execution configuration, though JUnit 5's parallel execution support has improved significantly in recent versions and is now a genuinely solid option too.