Do not filter HttpMessageConverters in WebMvcTest

Closes gh-8617

spring-boot-test-autoconfigure/src/main/java/org/springframework/boot/test/autoconfigure/web/servlet/WebMvcTypeExcludeFilter.java

@@ -29,6 +29,7 @@ import org.springframework.boot.web.servlet.DelegatingFilterProxyRegistrationBea
 import org.springframework.boot.web.servlet.FilterRegistrationBean;
 import org.springframework.context.annotation.ComponentScan.Filter;
 import org.springframework.core.annotation.AnnotatedElementUtils;
+import org.springframework.http.converter.HttpMessageConverter;
 import org.springframework.stereotype.Controller;
 import org.springframework.util.ObjectUtils;
 import org.springframework.web.bind.annotation.ControllerAdvice;
@@ -53,6 +54,7 @@ class WebMvcTypeExcludeFilter extends AnnotationCustomizableTypeExcludeFilter {
 		includes.add(FilterRegistrationBean.class);
 		includes.add(DelegatingFilterProxyRegistrationBean.class);
 		includes.add(HandlerMethodArgumentResolver.class);
+		includes.add(HttpMessageConverter.class);
 		includes.add(ErrorAttributes.class);
 		DEFAULT_INCLUDES = Collections.unmodifiableSet(includes);
 	};

spring-boot-test-autoconfigure/src/test/java/org/springframework/boot/test/autoconfigure/web/servlet/WebMvcTypeExcludeFilterTests.java

@@ -25,6 +25,7 @@ import org.springframework.context.annotation.FilterType;
 import org.springframework.core.type.classreading.MetadataReader;
 import org.springframework.core.type.classreading.MetadataReaderFactory;
 import org.springframework.core.type.classreading.SimpleMetadataReaderFactory;
+import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
 import org.springframework.stereotype.Controller;
 import org.springframework.stereotype.Repository;
 import org.springframework.stereotype.Service;
@@ -50,6 +51,7 @@ public class WebMvcTypeExcludeFilterTests {
 		assertThat(excludes(filter, Controller2.class)).isFalse();
 		assertThat(excludes(filter, ExampleControllerAdvice.class)).isFalse();
 		assertThat(excludes(filter, ExampleWeb.class)).isFalse();
+		assertThat(excludes(filter, ExampleMessageConverter.class)).isFalse();
 		assertThat(excludes(filter, ExampleService.class)).isTrue();
 		assertThat(excludes(filter, ExampleRepository.class)).isTrue();
 	}
@@ -62,6 +64,7 @@ public class WebMvcTypeExcludeFilterTests {
 		assertThat(excludes(filter, Controller2.class)).isTrue();
 		assertThat(excludes(filter, ExampleControllerAdvice.class)).isFalse();
 		assertThat(excludes(filter, ExampleWeb.class)).isFalse();
+		assertThat(excludes(filter, ExampleMessageConverter.class)).isFalse();
 		assertThat(excludes(filter, ExampleService.class)).isTrue();
 		assertThat(excludes(filter, ExampleRepository.class)).isTrue();
 	}
@@ -74,6 +77,7 @@ public class WebMvcTypeExcludeFilterTests {
 		assertThat(excludes(filter, Controller2.class)).isTrue();
 		assertThat(excludes(filter, ExampleControllerAdvice.class)).isTrue();
 		assertThat(excludes(filter, ExampleWeb.class)).isTrue();
+		assertThat(excludes(filter, ExampleMessageConverter.class)).isTrue();
 		assertThat(excludes(filter, ExampleService.class)).isTrue();
 		assertThat(excludes(filter, ExampleRepository.class)).isTrue();
 	}
@@ -86,6 +90,7 @@ public class WebMvcTypeExcludeFilterTests {
 		assertThat(excludes(filter, Controller2.class)).isFalse();
 		assertThat(excludes(filter, ExampleControllerAdvice.class)).isFalse();
 		assertThat(excludes(filter, ExampleWeb.class)).isFalse();
+		assertThat(excludes(filter, ExampleMessageConverter.class)).isFalse();
 		assertThat(excludes(filter, ExampleService.class)).isTrue();
 		assertThat(excludes(filter, ExampleRepository.class)).isFalse();
 	}
@@ -98,6 +103,7 @@ public class WebMvcTypeExcludeFilterTests {
 		assertThat(excludes(filter, Controller2.class)).isFalse();
 		assertThat(excludes(filter, ExampleControllerAdvice.class)).isFalse();
 		assertThat(excludes(filter, ExampleWeb.class)).isFalse();
+		assertThat(excludes(filter, ExampleMessageConverter.class)).isFalse();
 		assertThat(excludes(filter, ExampleService.class)).isTrue();
 		assertThat(excludes(filter, ExampleRepository.class)).isTrue();
 	}
@@ -153,6 +159,10 @@ public class WebMvcTypeExcludeFilterTests {
 
 	}
 
+	static class ExampleMessageConverter extends MappingJackson2HttpMessageConverter {
+
+	}
+
 	@Service
 	static class ExampleService {