Testing - Interview Questions and Answers for 'Mockito' | Search Interview Question

Testing - Interview Questions and Answers for 'Mockito' - 17 question(s) found - Order By Rating

Q1. How do you mock private methods using Mockito ?

Mockito

Ans. We just declare the methods as protected and mark them with the annotation @visibleForTesting

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Q2. Can we mock private methods ?

PowerMock

Ans. Yes, using Power Mock.

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Q3. Does it make sense to mock integration calls during stress / load test ?

Testing

Ans. No, its usually not done.

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Q4. What is doCallRealMethod() method used for ?

PowerMock

Ans. When we Mock an object and then make a reference to any method using mocked object reference , java never makes a call to that method and looks for mocked value to be returned or null if none specified. But If we want that to be overridden and want java to make actual method call upon using mocked object reference, this method can be used.

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Q5. What does the following code

MockitoAnnotations.initMocks(this);

Mockito

Ans. Initializes objects annotated with Mockito annotations

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Q6. Have you ever used PowerMock ? If yes , which mocking framework you have used it with ?

PowerMock

Ans. Yes, I have used PowerMockito with Mockito.

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Q7. Does it make sense to verify a method call if we already have a mock for it.

For example -

Mockito.when(a.callMethod()).thenReturn(1);
verify(a.callMethod()); // Does it make sense

Mockito

Ans. There is no guarantee that the mock will get called as callMethod may never get called. Verify is to make sure that the method gets called. Mock is it return 1 if the method gets called so they both are kind of independent things.

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Q8. Do you use Mockito's generic any method or just prefer to use specific arguments ?

Mockito

Ans. It depends on the data type, we use as the parameter.
If it is a simple data type and we validate the input, we may use specific arguments.
Else, we can go for the generic any

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Q9. Can we mock static methods using Mockito ?

PowerMock

Ans. No, We can use PowerMock for that.

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Q10. How do you use Mock frmaework to test webservices in any of your previous project ?

Testing

Ans. We were having client methods to call web services and were mocking the client method call using Mockito.

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Q11. Can we mock static methods ?

Testing

Ans. Yes we can use PowerMock. With Mockito , we cannot mock static methods.

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Q12. Have you ever tried mocking static methods ?

Testing

Ans. Yes, that can be done using Power Mock. Mockito doesnt provide a way to mock static methods.

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Q13. Difference between Assert and Verify ?

Testing

Ans. Assert works only if assertions ( -ea ) are enabled which is not required for Verify.Assert throws an exception and hence doesn't continue with the test if assert evaluates to false whereas it's not so with Verify.

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Q14. What should I do if I want to make sure that a particular method of a class is getting called ?

Ans. If its a static method of the class , we can use verify to make sure its getting called.

If its an instance method , We can mock the object and then use verify with the mocked object to make sure that the method is getting called.

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Q15. What is the use of Mockito.any ?

Ans. In case we need to verify that a method is being called with any argument and not a specific argument we can use Mockito.any(Class), Mockito.anyString, Mockito.anyLong etc.

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Q16. What are the steps to be performed while coding Junit with Mocking framework ?

JUnit

Ans. Initialize required objects for working with mocks and tested method
Set the mock behaviour on dependent objects
Execute the tested method
Perform assertions
Verify if a method is invoked or not

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Q17. Which of the following is not the advantage of Mocking frameworks ?

a. It helps testing the module independently
b. It helps in faster unit testing
c. It helps in testing code even when external dependencies like service calls are not working
d. It helps in doing end to end Integration Testing

Ans. It helps in doing end to end Integration Testing

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