Testing and Code Quality Questions

Knowledge and practice of testing strategies and code quality processes that help ensure reliable, maintainable mobile applications. Candidates should be able to describe unit, integration, and end to end testing approaches; how to design testable code through separation of concerns, interface boundaries, and dependency injection; and practical usage of testing frameworks such as XCTest, JUnit, or Jest. They should explain techniques for mocking or stubbing network and persistence layers, structuring fast and deterministic test suites, and reducing flakiness. Discuss also code review standards, static analysis and linting practices, continuous integration pipelines for automated testing, and trade offs between test coverage and development velocity.