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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.

HardTechnical
55 practiced
A suite of UI tests passes locally but fails intermittently on pull requests in CI. What steps would you take to reproduce the issue, identify the root cause, and reduce the flakiness without simply deleting the tests?
MediumTechnical
61 practiced
How would you structure a mobile CI pipeline so that fast tests run on every pull request, broader checks still happen before release, and the pipeline stays reliable enough that engineers trust it?
MediumTechnical
66 practiced
What are the trade-offs between code coverage and meaningful coverage? When can a high coverage number be misleading, and what other signals would you use to judge whether the test suite is actually protecting the product?
EasyTechnical
75 practiced
For a mobile app feature, how do unit tests, integration tests, and end-to-end tests differ in purpose, speed, and failure modes? If you were starting a new feature from scratch, how would you decide which behaviors belong in each layer?
MediumTechnical
69 practiced
For a mobile feature that also needs to be usable with VoiceOver or TalkBack, how do you incorporate accessibility checks into your testing strategy? What can be validated automatically, and what still needs manual verification?

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