1. Set up a Maven or Gradle project with JUnit 5 dependencies.
2. Create a test class with the `Test` suffix.
3. Use `@Test` annotation to define test methods.
4. Apply the Arrange-Act-Assert (AAA) pattern within each test method.
5. Use assertions from `org.junit.jupiter.api.Assertions` or AssertJ to verify expected behavior.
6. For data-driven tests, use `@ParameterizedTest` with `@ValueSource`, `@MethodSource`, `@CsvSource`, or `@CsvFileSource`.
7. Use mocking frameworks like Mockito to isolate dependencies.
8. Organize tests using packages, tags, and nested classes.
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