StreamBridge Final Cannot Be Mocked

Question

I am not able to mock StreamBridge in my Unit Tests.

@MockBean
private StreamBridge bridge;

I get an IllegalStateException due to:

Caused by: org.mockito.exceptions.base.MockitoException: Cannot mock/spy class org.springframework.cloud.stream.function.StreamBridge Mockito cannot mock/spy because :

• final class at org.springframework.boot.test.mock.mockito.MockDefinition.createMock(MockDefinition.java:154)

Answer 1

StreamBridge is a final class, With Mockito2 we can mock the final class, but by default this feature is disabled and that need to enable with below steps:

1. Create a directory ‘mockito-extensions’ in src/test/resources/ folder.

2. Create a file ‘org.mockito.plugins.MockMaker’ in ‘src/test/resources/mockito-extensions/’ directory.

3. Write the content 'mock-maker-inline' in org.mockito.plugins.MockMaker file.

4. At test class level use ‘@ExtendWith(MockitoExtension.class)’

Then StreamBridge will be mocked successfully.