e053e14158
Prior to this commit, we could only test Spring GraphQL applications with a complete application - all application and infrastructure components were involved. While using `@SpringBootTest` is often useful for complete integration tests (with or without a live running server), we often want to write lean integration tests and test slices of our application. Just like `@WebMvcTest` or `@WebFluxTest`, this commit introduces the support for `@GraphQlTest`. This annotation helps us to test a particular slice of our application: a hand-picked selection of `@Controller`, plus `RuntimeWiringConfigurer` and `WebInterceptor` beans. Other `@Component` must be imported or mocked for those tests. This commit also refactors the existing auto-configuration to enable this use case. The `WebGraphQlHandlerAutoConfiguration` now holds the required components for `@GraphQlTest`, while other web-related auto-configurations bring the web framework and transport infrastructures. Closes gh-75