How Can I Mock Final Classes and Methods with Mockito?

Mocking Private or Final Methods/Classes with Mockito

When working with testing, mocking final classes or methods is a common challenge. Mockito, a popular mocking framework, traditionally faced limitations in this aspect. However, with the release of Mockito v2, this obstacle has been overcome.

To mock a final class with Mockito v2, follow these steps:

1. Include Mockito v2 in Gradle:

   testImplementation 'org.mockito:mockito-inline:2.13.0'

2. Mock the Class Directly:

   // Given
   FinalClass finalClass = mock(FinalClass.class);

   Note that you do not need to declare the @Mock annotation, as in older Mockito versions.

Limitations of Mockito v1:

As mentioned in the Mockito FAQ, Mockito v1 has limitations when it comes to mocking final classes. This is because final classes cannot be dynamically generated during runtime, a requirement for mocking.

What are the limitations of Mockito

...

Cannot mock final classes

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