Jest MCQs Solution | TCS Fresco Play | FrescoPlay | MNC Answers

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Jest MCQs Solution | TCS Fresco Play | FrescoPlay | TCS


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1. Jest works well with other testing libraries like 

all of the options


2. Jest is used to test _.

Java script


3. Jest is a JavaScript unit testing framework.

True


4. How to install Jest using npm?

npm install --save-dev jest


5. The below test will pass.

False


6. You can check strings against regular expressions with ______________ .

toMatch


7. Jest uses ________ and ________ matchers to test a value is with exact equality

ToBe , toEqual


8. The number can be compared using

all of the options


9. To create a mock function, we use jest.fn().

True


10. ______________ resets all information stored in the mockFn.mock.calls and mockFn.mock.instances arrays.

mockClear()


11. .mock is a property of mock function, the place where all information about how the function has been called is kept.

True


12. Jest supports ______________ for Isolating functionality into small, testable units under test.

Mock fn


13. The Asynchronous code will move on to another task before it finishes.

True


14. When you execute ______________ Code, it will move on to another task before it finishes.

asyn


15. Jest will wait until the ______________ callback is called before finishing the test.

done


16. ______________ is useful when you want to mock functions in certain test cases and restore the original implementation in others.

mockRestore()


17. ______________ resets all information stored in the mock, including any inital implementation given.

mockReset()


18. To test a particular function which throws an error when it's called, you can use toThrow.

True


19. Code coverage tests that how much code is covered under tests

True


20. ______________ is useful when you want to completely restore a mock back to its initial state.

mockreset


21. The Synchronous Code will move on to another task before it finishes.

False


22. What is the command to install Jest and the babel-jest ?

$ npm install –dev-save jest babel-jest

$ npm install jest --save-dev babel-jestxxx

$ npm install --save-dev jest babel-jest

$ npm install -save-dev jest babel-jest


23. ______________ returns the value only once when mock function is called.

mockReturnValue(value)xxx

mockReturnOnce(value)

mockReturnValueOnce(value)

None of the options


24. How to install Jest using yarn?

yarn add --dev jest


25. ______________ is an array that records all the object instances that have been instantiated from the mock function using new.

mock.instances



26. Which method is useful to clean up a mock's usage data between two assertions.

mockClear()


27. mockRestore() removes the mock and restores the initial implementation

True


28. How to install Jest using npm?

npm install jest --save-dev

npm install --save-dev jest

npm add –save-dev jest

all the optionsxxxx



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