junit

What problem does it solve?

Java projects rely on unit tests to validate behavior, catch regressions early, and enable safe refactoring; JUnit provides a standard framework to write, organize, and execute those tests efficiently.

Core Features & Use Cases

• Test annotations and lifecycle: support for @Test, @BeforeEach, @AfterEach, @BeforeAll, and @AfterAll to manage test setup and teardown.
• Assertions and parameterized tests: a rich set of assertions and the ability to drive tests with @ParameterizedTest and sources for data variations.
• Test organization and integration: integrates with IDEs and CI pipelines to run and report tests across Java projects.

Quick Start

Create a Maven or Gradle project, add the JUnit dependency, and write a simple test method annotated with @Test to verify a basic behavior.