Clarify scope of "@SpringBootTest#classes"

[ttddyy]

I found this test passes:

@SpringBootTest(classes = RestTemplate.class)
class MyTest {

    @Autowired
    RestTemplate restTemplate;

    @Test
    void check() {
        assertThat(restTemplate).isNotNull();
    }
}

The underlying reason is same as what I reported here: spring-projects/spring-framework#23638

Since spring-boot is more opinionated, I think it makes sense to restrict @SpringBootTest#classes for only @Configuration classes.

SpringBootTestContextBootstrapper may filter out non @Configuration classes or throw exception when it constructs MergedContextConfiguration.

[snicoll]

Thanks for the suggestion but I don't think we should restrict classes to be configuration classes. However, I can see the "annotated classes" part was copied from what the documentation for @ContextConfiguration states. We're polishing that in spring-projects/spring-framework#23638 and should apply the same here.

[sbrannen]

FYI: spring-projects/spring-framework#23638 has been resolved.

[snicoll]

Closed by e4ba604