Java Unit Test Rules

1. Framework

• Use JUnit 5 as the default testing framework.

2. Structure

• Follow Arrange–Act–Assert pattern.
• Each test should clearly define input, execution, and assertions.

3. Naming

• Test method names should describe the behavior, e.g., shouldReturnFalseForInvalidPassword.

4. Edge Cases

• Always test for:
  • Null values
  • Empty strings
  • Invalid formats

5. Mocking

• Use Mockito when testing service classes with dependencies.

6. Readability

• Prefer one assertion per test when possible.
• Use @BeforeEach to initialize shared test objects.