Annotate @…Test annotations with @ExtendWith(SpringExtension.class)

[wilkinsona]

As a convenience for those using JUnit 5, we could annotate our @…Test annotations with @ExtendWith(SpringExtension.class). This would mean that this:

@ExtendWith(SpringExtension.class)
@SpringBootTest(webEnvironment = WebEnvironment.RANDOM_PORT)
class SampleJunitJupiterApplicationTests {

Could be this instead:

@SpringBootTest(webEnvironment = WebEnvironment.RANDOM_PORT)
class SampleJunitJupiterApplicationTests {

When JUnit 4 is being used, the @ExtendWith annotation would be dropped automatically by the JVM as it isn't on the classpath. Any ASM-based annotation discovery should already be sufficiently robust to ignore it too.