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I just migrated my project from Spring Boot 2.1 to 2.3 and thus have now JUnit 5 (with vintage) in place (also including mockito-core and mockito-junit-jupiter of version 3.3.3). While all JUnit 4 tests are working fine my first JUnit 5 tests is not working correctly:
@ExtendWith(MockitoExtension.class)
public class SomeTest {
@InjectMocks
private Some to;
@Mock
private SomeProperties properties;
@Test
public void applied() {
....
//properties is null -> NPE
when(properties.getSome()).thenReturn("some");
....
}
The mocks are not injected (NPE in when statement). If i switch to old JUnit 4 style @RunWith(MockitoJUnitRunner.class) all is working fine.
So probably the old runner or vintage runner is used?
How to fix this and get tests with "@ExtendWith" working? I thought i can migrate step by step - let new tests run with junit5 runner.
206
The @ExtendWith annotation is used to load a JUnit 5 extension. JUnit defines an extension API, which allows a third-party vendor like Mockito to hook into the lifecycle of running test classes and add additional functionality.
Mockito provides an implementation for JUnit5 extensions in the library — mockito-junit-jupiter.
Power mock is not compatible with JUnit5 So we will discuss it will JUnit4.
Ensure you use the correct import for the @Test annotation:
JUnit 4: org.junit.Test
JUnit 5: org.junit.jupiter.api.Test
126
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