How to make junit jupiter integration test aware of spring context?

Question

I've defined CompactDisc bean in my spring application. According to Spring TestContext Framework , SpringJunit4ClassRunner can make the following junit-jupiter integration test aware of spring context.

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes = CdConfig.class)
public class CdTest {

    @Autowired
    private CompactDisc cd;
    
    @Test
    public void cdShouldNotBeNull() {
        assertNotNull(cd);
    }

}

But seems the CompactDisc instance was not autowired.

> Task :soundsystem:test FAILED

CdTest > cdShouldNotBeNull() FAILED
    org.opentest4j.AssertionFailedError at CdTest.java:35

In gradle.build I use junit platform to run the test,

test {
    useJUnitPlatform()
    testLogging {
        events 'passed'
    }
}

Did useJUnitPlatform() overwrite the @RunWith(SpringJUnit4ClassRunner.class) setting?

I tried with @ExtendWith(SpringExtension.class) , now it works.

@ExtendWith(SpringExtension.class)
@ContextConfiguration(classes = CdConfig.class)
public class CdTest {

    @Autowired
    private CompactDisc cd;
    
    @Test
    public void cdShouldNotBeNull() {
        assertNotNull(cd);
    }

}

> Task :soundsystem:test

CdTest > cdShouldNotBeNull() PASSED

Anyone can explain why @RunWith(SpringJUnit4ClassRunner.class) failed?

Answer 1

From SpringExtension.class document: SpringExtension integrates the Spring TestContext Framework into JUnit 5's Jupiter programming model.

So SpringExtension.class is for JUnit5 and SpringJUnit4ClassRunner.class for JUnit4

JUnit5 (also called Jupiter) document reference

JUnit4 document reference