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Mockito Interview Questions
- What is Mockito?
Answer: Mockito is a popular open-source mocking framework used for testing Java applications. - Why is Mockito used for testing?
Answer: Mockito is used to create mock objects for testing. These mock objects can be used to isolate the unit under test and verify its behavior. - How does Mockito work?
Answer: Mockito creates a mock object that can be used to replace a real object during testing. The mock object can be used to stub methods, simulate exceptions, and verify method calls. - What is a mock object?
Answer: A mock object is a replacement for a real object that is used during testing. A mock object is created using a mocking framework like Mockito and can be used to isolate the unit under test and verify its behavior. - What is a stub in Mockito?
Answer: A stub is a method that returns a specific value when called. Mockito allows you to create stubs for methods using the when-then pattern. - What is a spy in Mockito?
Answer: A spy is a real object that is wrapped in a Mockito object. The spy allows you to monitor the behavior of the real object and stub its methods. - What is the difference between a mock and a spy in Mockito?
Answer: A mock is a completely fake object that is used to isolate the unit under test. A spy is a real object that is wrapped in a Mockito object and allows you to monitor its behavior. - What is the @Mock annotation in Mockito?
Answer: The @Mock annotation is used to create a mock object for a class. The mock object can be used to stub methods and verify behavior. - What is the @InjectMocks annotation in Mockito?
Answer: The @InjectMocks annotation is used to inject the mock objects created with the @Mock annotation into the class being tested. - What is the @Spy annotation in Mockito?
Answer: The @Spy annotation is used to create a spy object for a class. The spy object can be used to monitor the behavior of the real object. - What is the difference between a @Mock and a @Spy annotation in Mockito?
Answer: The @Mock annotation creates a completely fake object, while the @Spy annotation wraps a real object in a Mockito object. - What is the Mockito.verify() method used for?
Answer: The Mockito.verify() method is used to verify that a method was called with the expected arguments. - What is the Mockito.any() method used for?
Answer: The Mockito.any() method is used to match any argument passed to a method during testing. - What is the Mockito.doThrow() method used for?
Answer: The Mockito.doThrow() method is used to simulate an exception being thrown by a method during testing. - What is the Mockito.doAnswer() method used for?
Answer: The Mockito.doAnswer() method is used to customize the behavior of a method during testing. - What is the difference between the doThrow() and thenThrow() methods in Mockito?
Answer: The doThrow() method is used to throw an exception before the method is called, while the thenThrow() method is used to throw an exception after the method is called. - What is the difference between the doReturn() and thenReturn() methods in Mockito?
Answer: The doReturn() method is used to return a value before the method is called, while the thenReturn() method is used to return a value after the method is called. - What is the difference between a mock and a spy in Mockito? Answer: A mock is a completely fake object that is used to isolate the unit under test. A spy is a real object that is wrapped in a Mockito object and allows you to monitor its behavior.
- What is the @Mock annotation in Mockito?
Answer: The @Mock annotation is used to create a mock object for a class. The mock object can be used to stub methods and verify behavior. - What is the @InjectMocks annotation in Mockito?
Answer: The @InjectMocks annotation is used to inject the mock objects created with the @Mock annotation into the class being tested. - What is the @Spy annotation in Mockito?
Answer: The @Spy annotation is used to create a spy object for a class. The spy object can be used to monitor the behavior of the real object. - What is the difference between a @Mock and a @Spy annotation in Mockito?
Answer: The @Mock annotation creates a completely fake object, while the @Spy annotation wraps a real object in a Mockito object. - What is the Mockito.verify() method used for?
Answer: The Mockito.verify() method is used to verify that a method was called with the expected arguments. - What is the Mockito.any() method used for?
Answer: The Mockito.any() method is used to match any argument passed to a method during testing. - What is the Mockito.doThrow() method used for?
Answer: The Mockito.doThrow() method is used to simulate an exception being thrown by a method during testing. - What is the Mockito.doAnswer() method used for?
Answer: The Mockito.doAnswer() method is used to customize the behavior of a method during testing. - What is the difference between the doThrow() and thenThrow() methods in Mockito?
Answer: The doThrow() method is used to throw an exception before the method is called, while the thenThrow() method is used to throw an exception after the method is called. - What is the difference between the doReturn() and thenReturn() methods in Mockito?
Answer: The doReturn() method is used to return a value before the method is called, while the thenReturn() method is used to return a value after the method is called. - What is the difference between stubbing and mocking in Mockito?
Answer: Stubbing is used to provide specific responses for method calls during testing, while mocking is used to create fake objects that can be used to isolate the unit under test. - What is the difference between a mock and a spy in Mockito?
Answer: A mock is a completely fake object that is used to isolate the unit under test. A spy is a real object that is wrapped in a Mockito object and allows you to monitor its behavior. - What is the Mockito.when() method used for?
Answer: The Mockito.when() method is used to stub a method call with a specific response during testing. - What is the difference between @Mock and @MockBean in Spring Boot testing?
Answer: @Mock is used in unit tests to create a mock object for a class, while @MockBean is used in integration tests to create a mock object for a Spring Bean. - What is the difference between @InjectMocks and @Autowired in Spring Boot testing?
Answer: @InjectMocks is used to inject the mock objects created with @Mock into the class being tested, while @Autowired is used to inject the real dependencies into the class being tested.
- What is the purpose of the Mockito framework?
Answer: The purpose of the Mockito framework is to provide a way to create mock objects for unit testing. - What is a mock object?
Answer: A mock object is a fake object that is used to isolate the unit under test from its dependencies. - What is the difference between a stub and a mock object?
Answer: A stub is a fake object that returns pre-determined responses to method calls, while a mock object is a fake object that can be programmed to simulate the behavior of a real object. - What is the difference between a spy and a mock object?
Answer: A spy is a real object that is wrapped in a Mockito object and allows you to monitor its behavior, while a mock object is a completely fake object that is used to isolate the unit under test. - How do you create a mock object in Mockito?
Answer: You can create a mock object in Mockito by using the @Mock annotation or the Mockito.mock() method. - What is the difference between a mock and a dummy object?
Answer: A dummy object is a placeholder object that is used to satisfy a method parameter, while a mock object is a fake object that is used to isolate the unit under test. - What is the difference between a fake object and a mock object?
Answer: A fake object is a simplified implementation of a real object that is used in testing, while a mock object is a fake object that can be programmed to simulate the behavior of a real object. - What is the difference between a unit test and an integration test?
Answer: A unit test is used to test a single component of an application in isolation, while an integration test is used to test the interactions between multiple components of an application. - How do you use the Mockito framework to verify that a method was called?
Answer: You can use the Mockito.verify() method to verify that a method was called with the expected arguments. - How do you use the Mockito framework to stub a method call?
Answer: You can use the Mockito.when() method to stub a method call with a specific response. - What is the difference between the thenReturn() and the thenThrow() methods in Mockito?
Answer: The thenReturn() method is used to specify a return value for a stubbed method call, while the thenThrow() method is used to specify an exception to be thrown. - What is the difference between the @Mock and @Spy annotations in Mockito?
Answer: The @Mock annotation creates a completely fake object, while the @Spy annotation wraps a real object in a Mockito object. - How do you use the Mockito framework to test exceptions and error conditions?
Answer: You can use the Mockito.doThrow() method to simulate an exception being thrown by a method during testing. - How do you use the Mockito framework to test private methods?
Answer: You can use the Mockito framework in combination with PowerMock to test private methods. - What is the difference between the @Mock and @MockBean annotations in Spring Boot testing?
Answer: @Mock is used to create a mock object for a class in a unit test, while @MockBean is used to create a mock object for a Spring Bean in an integration test. - What is the difference between the @InjectMocks and @Autowired annotations in Spring Boot testing?
Answer: @InjectMocks is used to inject the mock objects created with @Mock into the class being tested, while @Autowired is used to inject the real dependencies into the class being tested.
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