Testing in React

Here's a quick quiz to test your knowledge of React testing, covering unit tests, snapshot testing, hooks, and asynchronous components!

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Question 1

What is the primary purpose of Jest in testing React applications?

  • Data fetching

  • Unit testing and mocking

  • Styling components

  • Routing components

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Question 2

Which of the following methods is used to render a React component in a test using React Testing Library?

  • renderComponent()

  • render()

  • testRender()

  • mount()

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Question 3

Which of the following is used to mock a function in Jest?

  • jest.fn()

  • mockFunction()

  • spyOn()

  • jest.mock()

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Question 4

Which Jest method is used to check whether a function was called?

  • toHaveBeenCalled()

  • toHaveBeenTriggered()

  • toHaveBeenExecuted()

  • toHaveBeenInvoked()

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Question 5

What does the screen object from React Testing Library provide?

  • It stores the component's state.

  • It interacts with the component's DOM.

  • It renders components.

  • It updates the component's props.

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Question 6

What is the main purpose of snapshot testing in React?

  • To measure the performance of the component

  • To ensure the UI does not change unexpectedly

  • To check for memory leaks

  • To test asynchronous components

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Question 7

Which Jest method is used to create a snapshot of a React component?

  • toMatchSnapshot()

  • toCreateSnapshot()

  • createSnapshot()

  • matchSnapshot()

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Question 8

What should be avoided when using snapshot testing?

  • Snapshot tests for non-UI logic

  • Frequent changes to the snapshot without validating

  • Using Jest’s toMatchSnapshot() in all tests

  • Both B and C

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Question 9

Which hook is used in React for managing component-level state?

  • useEffect()

  • useState()

  • useContext()

  • useReducer()

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Question 10

Which testing strategy is recommended for testing asynchronous components?

  • Use screen.findByText()

  • Mock all asynchronous actions

  • Avoid using hooks with asynchronous code

  • Test without considering async behavior

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There are 10 questions to complete.

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