Test Code Structure and Best Practices Questions

Principles and practices for writing test code that is readable, maintainable, and reliable. Topics include structuring tests using the arrange act assert pattern, designing and reusing fixtures and helper utilities, proper setup and teardown and test isolation, avoiding duplication, naming conventions and test granularity, parameterized tests, managing test data and mocks through dependency injection where appropriate, code review practices for test code, and strategies for evolving test suites as the product changes.