Include `ErrorAttributes` in @WebMvcTest

Import the additional auto-configuration classes required for
`ErrorAttributes` and change the filter so that it's no longer
hidden.

Fixes gh-7867

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

@@ -21,6 +21,7 @@ import java.util.Collections;
 import java.util.LinkedHashSet;
 import java.util.Set;
 
+import org.springframework.boot.autoconfigure.web.ErrorAttributes;
 import org.springframework.boot.context.TypeExcludeFilter;
 import org.springframework.boot.jackson.JsonComponent;
 import org.springframework.boot.test.autoconfigure.filter.AnnotationCustomizableTypeExcludeFilter;
@@ -54,6 +55,7 @@ class WebMvcTypeExcludeFilter extends AnnotationCustomizableTypeExcludeFilter {
 		includes.add(FilterRegistrationBean.class);
 		includes.add(DelegatingFilterProxyRegistrationBean.class);
 		includes.add(HandlerMethodArgumentResolver.class);
+		includes.add(ErrorAttributes.class);
 		DEFAULT_INCLUDES = Collections.unmodifiableSet(includes);
 	};
 

spring-boot-test-autoconfigure/src/main/resources/META-INF/spring.factories

@@ -79,7 +79,9 @@ org.springframework.boot.autoconfigure.MessageSourceAutoConfiguration,\
 org.springframework.boot.autoconfigure.mustache.MustacheAutoConfiguration,\
 org.springframework.boot.autoconfigure.thymeleaf.ThymeleafAutoConfiguration,\
 org.springframework.boot.autoconfigure.validation.ValidationAutoConfiguration,\
+org.springframework.boot.autoconfigure.web.ErrorMvcAutoConfiguration,\
 org.springframework.boot.autoconfigure.web.HttpMessageConvertersAutoConfiguration,\
+org.springframework.boot.autoconfigure.web.ServerPropertiesAutoConfiguration,\
 org.springframework.boot.autoconfigure.web.WebMvcAutoConfiguration
 
 # DefaultTestExecutionListenersPostProcessors

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

@@ -24,9 +24,11 @@ import org.junit.rules.ExpectedException;
 import org.junit.runner.RunWith;
 
 import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.autoconfigure.web.ErrorAttributes;
 import org.springframework.test.context.junit4.SpringRunner;
 import org.springframework.test.web.servlet.MockMvc;
 
+import static org.assertj.core.api.Assertions.assertThat;
 import static org.hamcrest.CoreMatchers.isA;
 import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
 import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.content;
@@ -48,6 +50,9 @@ public class WebMvcTestAllControllersIntegrationTests {
 	@Autowired
 	private MockMvc mvc;
 
+	@Autowired(required = false)
+	private ErrorAttributes errorAttributes;
+
 	@Test
 	public void shouldFindController1() throws Exception {
 		this.mvc.perform(get("/one")).andExpect(content().string("one"))
@@ -78,4 +83,10 @@ public class WebMvcTestAllControllersIntegrationTests {
 		this.mvc.perform(get("/three/invalid"));
 	}
 
+	@Test
+	public void shouldNotFilterErrorAttributes() throws Exception {
+		assertThat(this.errorAttributes).isNotNull();
+
+	}
+
 }