Testing in JavaScript

Quiz yourself on Jest,Mocha,and other JavaScript testing frameworks.

1. Which company developed the Jest testing framework?

Google Facebook Microsoft Netflix

2. Which of the following are JavaScript testing frameworks? (Select all that apply)

Jest Mocha React Cypress Express

3. Unit tests focus on testing individual functions or components in isolation.

True False

4. What does TDD stand for? (full phrase)

5. What is the primary purpose of a mock function in JavaScript testing?

To style UI components To replace external dependencies To bundle JavaScript files To minify test code

6. Which Jest method runs a function before each individual test in a suite?

beforeAll beforeEach afterEach afterAll

7. Which of the following are types of test doubles? (Select all that apply)

Mock Stub Spy Hook Assertion

8. Cypress is primarily used for writing unit tests.

True False

9. Name a popular assertion library commonly used with Mocha for testing.

10. In Jest, which assertion checks if a value is truthy?

expect(value).toBeTruthy() expect(value).isTrue() expect(value).truthy() expect(value).assertTrue()

11. How can you handle asynchronous code in Jest tests? (Select all that apply)

Using the done callback Returning a Promise Using async/await Wrapping in setTimeout Using eval()

12. Integration tests verify interactions between multiple components or modules.

True False

13. What does E2E stand for in the context of testing? (full phrase)

14. Which testing framework is commonly used with React Testing Library for component testing?

Mocha Jest Cypress Playwright

15. Which tools are used for end-to-end (E2E) testing in JavaScript? (Select all that apply)

Cypress Playwright Jest Puppeteer Mocha

16. A stub function is used to return predefined values to control test behavior.

True False

17. What term describes a test that checks if a function throws an expected error?

18. In Jest and Mocha, what does an 'it' block represent?

A test suite A single test case A setup function A teardown function

19. Which layers are part of the testing pyramid? (Select all that apply)

Unit tests Integration tests End-to-end tests Performance tests Load tests

20. Jest requires an external assertion library to write test assertions.

True False

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