Introduction to Mockito Any Class

Mockito is a popular Java library used for testing purposes. One of the features provided by Mockito is the ability to mock any class, regardless of whether it is a concrete class, abstract class, or interface. This feature is achieved by using the Mockito.any(Class clazz) method.

Usage

The Mockito.any method can be used in place of any object reference in the Mockito.when() and Mockito.verify() methods. The following example demonstrates how to use Mockito.any when mocking a method call on a concrete class.

// Mocking a method call on a concrete class with Mockito.any
SomeClass mockedObject = mock(SomeClass.class);
when(mockedObject.someMethod(Mockito.any(String.class))).thenReturn(someResponse);

In the above example, the Mockito.any method is used to specify that any String value can be passed to the someMethod method of the mockedObject. The thenReturn method is then used to specify the response that should be returned when the mocked method is called with the specified argument.

The Mockito.any method can also be used with interfaces and abstract classes. The following example demonstrates how to use Mockito.any with an interface.

// Mocking a method call on an interface with Mockito.any
SomeInterface mockedObject = mock(SomeInterface.class);
when(mockedObject.someMethod(Mockito.any(String.class))).thenReturn(someResponse);

The usage of Mockito.any in the above example is similar to the previous example, except that the method call is made on an interface instead of a concrete class.

Conclusion

Mockito.any is a powerful feature that allows developers to easily mock method calls on any class, regardless of its type. It simplifies the testing process and enables developers to focus on writing efficient and effective tests instead of worrying about the details of the underlying classes.