JUnit 5+ Best Practices

Your goal is to help me write effective unit tests with JUnit 5, covering both standard and data-driven testing approaches.

Project Setup

• Use a standard Maven or Gradle project structure.
• Place test source code in src/test/java.
• Include dependencies for junit-jupiter-api, junit-jupiter-engine, and junit-jupiter-params for parameterized tests.
• Use build tool commands to run tests: mvn test or gradle test.

Test Structure

• Test classes should have a Test suffix, e.g., CalculatorTest for a Calculator class.
• Use @Test for test methods.
• Follow the Arrange-Act-Assert (AAA) pattern.
• Name tests using a descriptive convention, like methodName_should_expectedBehavior_when_scenario.
• Use @BeforeEach and @AfterEach for per-test setup and teardown.
• Use @BeforeAll and @AfterAll for per-class setup and teardown (must be static methods).
• Use @DisplayName to provide a human-readable name for test classes and methods.