How can I use injection with Mockito and JUnit 5?
In JUnit4 I can just use the @RunWith(MockitoJUnitRunner.class) Annotation. In JUnit5 is no @RunWith Annotation?
There are different ways to use Mockito - I'll go through them one by one.
Manually
Creating mocks manually with Mockito::mock works regardless of the JUnit version (or test framework for that matter).
Annotation Based
Using the @Mock-annotation and the corresponding call to MockitoAnnotations::initMocks
to create mocks works regardless of the JUnit version (or test framework for that matter but Java 9 could interfere here, depending on whether the test code ends up in a module or not).
Mockito Extension
JUnit 5 has a powerful extension model and Mockito recently published one under the group / artifact ID org.mockito : mockito-junit-jupiter.
You can apply the extension by adding @ExtendWith(MockitoExtension.class) to the test class and annotating mocked fields with @Mock. From MockitoExtension's JavaDoc:
@ExtendWith(MockitoExtension.class)
public class ExampleTest {
@Mock
private List list;
@Test
public void shouldDoSomething() {
list.add(100);
}
}
The Mockito documentation is still a little silent on the extension.
No Rules, No Runners
JUnit 4 rules and runners don't work in JUnit 5, so the MockitoRule and the Mockito runner can not be used.