Test Structure - Name test files with or suffix - Place test files next to the code they test or in a dedicated directory - Use descriptive test names that explain the expected behavior - Use nested describe blocks to organize related tests - Follow the pattern: Effective Mocking - Mock external dependencies (APIs, databases, etc.) to isolate your tests - Use for module-level mocks - Use for specific function mocks - Use or to define mock behavior - Reset mocks between tests with in Testing Async Code - Always return promises or use async/await syntax in tests - Use / matchers for promises -…