Can I use PowerMock and Mockito together in the same test class

Using PowerMock with Mockito

To use both PowerMock and Mockito in a test class, you need to follow these steps:

1. Annotations: Use `@RunWith(PowerMockRunner.class)` at the class level to enable PowerMock. Additionally, if you are working with Spring, you might need to delegate to another runner using `@PowerMockRunnerDelegate(SpringRunner.class)` to ensure Spring's functionality works correctly[1][4].

2. Prepare Classes for Mocking: Use the `@PrepareForTest` annotation to specify the classes that you want to mock using PowerMock. This is necessary for mocking static methods or other features not supported by Mockito[2][7].

3. Mocking with Mockito and PowerMockito: You can use Mockito for most of your mocking needs, and PowerMockito (an extension of PowerMock) for mocking static methods or other hard-to-test code. Ensure that you use the correct methods from each library to avoid confusion. For example, use `Mockito.when()` for regular mocking and `PowerMockito.when()` for static methods[3][4].

Example Usage

Here is a simplified example of how you might use both PowerMock and Mockito in a test class:

java
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.InjectMocks;
import org.mockito.Mock;
import org.powermock.api.mockito.PowerMockito;
import org.powermock.core.classloader.annotations.PrepareForTest;
import org.powermock.modules.junit4.PowerMockRunner;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

@RunWith(PowerMockRunner.class)
@PowerMockRunnerDelegate(SpringRunner.class)
@SpringBootTest
@PrepareForTest({StaticClass.class}) // Prepare a class for mocking static methods
public class MyTest {

    @Mock
    private ExternalService externalService;

    @Autowired
    @InjectMocks
    private MyServiceImpl myService;

    @Test
    public void testMyService() {
        // Mock static method using PowerMockito
        PowerMockito.mockStatic(StaticClass.class);
        PowerMockito.when(StaticClass.staticMethod()).thenReturn("Mocked Value");

        // Use Mockito for regular mocking
        Mockito.when(externalService.doSomething()).thenReturn("Mocked Response");

        // Perform the test
        String result = myService.doSomething();
        // Assert the result
    }
}

Best Practices

- Use PowerMock Sparingly: PowerMock should be used only when necessary, as it can make tests harder to understand and maintain. Prefer Mockito for most mocking tasks[5].
- Clear Method Usage: Ensure that your team is clear about which methods are being used from Mockito and which from PowerMockito to avoid confusion[4].
- Test Readability: Keep your tests readable by clearly documenting what is being mocked and why.