Automated Unit Testing with Jest

Auto audio on: the next questions will be read aloud when you click Continue.

1. 1

   What is Jest mainly used for?

   A Unit testing JavaScript code B Managing database migrations C Performance testing of web applications
2. 2

   Which method of Jest is used to create a mock function?

   A jest.createMock() B jest.fn() C jest.simulate()
3. 3

   What does 'expect.assertions(number)' do in Jest?

   A Ensure a certain number of assertions are called B Check if all tests have passed C Set the number of times a test should run
4. 4

   Which Jest feature allows testing whether a value closes to another value?

   A toFit() B toMatchClose() C toBeCloseTo()
5. 5

   If a Jest test uses 'done' as a parameter, what does it imply?

   A The test checks for exceptions B The test is asynchronous C The test needs snapshot testing
6. 6

   What is the purpose of 'beforeEach()' in Jest tests?

   A Run some setup code before each test in a test suite B Declare a test suite C Asynchronously fetch data and return
7. 7

   What does 'jest.mock()' do?

   A Runs a test a number of times B Tests static files C Mocks module dependencies
8. 8

   Which Jest method allows you to re-run a specific test out of many quickly?

   A runOnlyTest() B test.only() C test.skip()
9. 9

   In Jest, which matcher checks if two objects have the same data?

   A toBe() B toMatch() C toEqual()
10. 10

    What does a 'watch' mode in Jest refer to?

    A Automatically rerun tests on file changes B Run tests at regular intervals C Pause test execution