Jest Advanced Quiz
Master advanced mocking, custom matchers, performance, CI/CD integration, and testing strategies
Start the quizSample questions from this quiz
A preview of the style and depth. Try each one, then reveal the answer — or skip straight to the timed quiz.
1. What is jest.config.js?
- Jest configuration
- Config module
- Configuration file for Jest settings
- Settings file
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Answer: Configuration file for Jest settings. jest.config.js configures Jest. Define testEnvironment, coverageThreshold, setupFiles, moduleNameMapper, transform, etc. Export configuration object.
2. What is testEnvironment?
- Test context
- Execution environment (node or jsdom)
- Runtime environment
- Execution context
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Answer: Execution environment (node or jsdom). testEnvironment sets execution environment. 'node' for Node.js APIs, 'jsdom' for browser-like DOM. Configure in jest.config.js or per-file with @jest-environment.
3. What is setupFilesAfterEnv?
- Setup configuration
- Framework setup
- Test initialization
- Runs setup code after test framework installed
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Answer: Runs setup code after test framework installed. setupFilesAfterEnv runs setup code after Jest installed. Configure global matchers, extend expect, setup test utilities. Array of file paths in jest.config.js.
Frequently asked questions
How many questions are in this Jest quiz?+
30 questions, with a 75-minute time limit. Every question includes a written explanation of the correct answer.
Is this Jest quiz free?+
Yes. Every quiz on CodexQuizz is free and needs no account. You only enter a name if you choose to post your score to the leaderboard.
What level is the advanced quiz aimed at?+
Master advanced mocking, custom matchers, performance, CI/CD integration, and testing strategies
Can I use this to prepare for a Jest interview?+
Yes. The questions cover the topics that come up in Jest technical screens, and the explanations are written so that a wrong answer still teaches you the underlying concept.
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