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Testing in React
Question 1
What is the primary purpose of Jest in testing React applications?
- A
Data fetching
- B
Unit testing and mocking
- C
Styling components
- D
Routing components
Question 2
Which of the following methods is used to render a React component in a test using React Testing Library?
- A
renderComponent()
- B
render()
- C
testRender()
- D
mount()
Question 3
Which of the following is used to mock a function in Jest?
- A
jest.fn()
- B
mockFunction()
- C
spyOn()
- D
jest.mock()
Question 4
Which Jest method is used to check whether a function was called?
- A
toHaveBeenCalled()
- B
toHaveBeenTriggered()
- C
toHaveBeenExecuted()
- D
toHaveBeenInvoked()
Question 5
What does the screen object from React Testing Library provide?
- A
It stores the component's state.
- B
It interacts with the component's DOM.
- C
It renders components.
- D
It updates the component's props.
Question 6
What is the main purpose of snapshot testing in React?
- A
To measure the performance of the component
- B
To ensure the UI does not change unexpectedly
- C
To check for memory leaks
- D
To test asynchronous components
Question 7
Which Jest method is used to create a snapshot of a React component?
- A
toMatchSnapshot()
- B
toCreateSnapshot()
- C
createSnapshot()
- D
matchSnapshot()
Question 8
What should be avoided when using snapshot testing?
- A
Snapshot tests for non-UI logic
- B
Frequent changes to the snapshot without validating
- C
Using Jest’s toMatchSnapshot() in all tests
- D
Both B and C
Question 9
Which hook is used in React for managing component-level state?
- A
useEffect()
- B
useState()
- C
useContext()
- D
useReducer()
Question 10
Which testing strategy is recommended for testing asynchronous components?
- A
Use screen.findByText()
- B
Mock all asynchronous actions
- C
Avoid using hooks with asynchronous code
- D
Test without considering async behavior
There are 10 questions to complete.
