unit-test-parameterized

Parameterized tests in JUnit 5 let a single test method execute against multiple input sets using @ParameterizedTest and data sources like @ValueSource, @CsvSource, or @MethodSource. This reduces duplication while covering valid, boundary, and invalid cases systematically.

@ValueSource supplies a single array of literals; @CsvSource provides comma-separated rows of multiple parameters; @MethodSource references a method returning a stream of arguments. Choose based on data complexity and reusability needs.

Yes. Add junit-jupiter dependencies to Maven or Gradle, then annotate test methods with @ParameterizedTest and supply data sources. Both build tools integrate JUnit 5 seamlessly for parameterized test execution.

Instead of writing separate test methods for each input, parameterized tests run identical assertions across multiple datasets in one method. This cuts code repetition while maintaining full coverage of valid, boundary, and invalid inputs.

Yes. Parameterized tests execute standard assertions per iteration, so AssertJ and other libraries work without modification. Each parameter set runs the same assertion logic independently.