How Can I Mock Final Classes with Mockito?

Mocking Final Classes in Mockito

When working with final classes, testing can become challenging due to their immutability. To overcome this hurdle, Mockito provides a solution in its version 2.

Implementation with Mockito v2

To mock final classes with Mockito v2, follow these steps:

1. Add the following to your gradle file:

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

2. Import the org.mockito.MockedStatic class.
3. Use MockedStatic to mock the final class:

@MockedStatic(RainOnTrees.class)
public class SeasonsTest {
    // Test methods here
}

Limitations with Mockito v1

Mocking final classes is not possible with Mockito v1. This is explicitly stated in the Mockito FAQ:

"Cannot mock final classes"

Alternatives for Mockito v1

If using Mockito v1, consider alternative solutions such as:

• Using reflection to modify the final class.
• Using a mocking framework that supports final class mocking, such as PowerMock.

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