Include WebSecurityConfigurer beans in @WebMvcTest

Update `WebMvcTypeExcludeFilter` to include `WebSecurityConfigurer`
beans.

Fixes gh-12275

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2017 the original author or authors.
+ * Copyright 2012-2018 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -33,6 +33,7 @@ import org.springframework.core.convert.converter.Converter;
 import org.springframework.core.convert.converter.GenericConverter;
 import org.springframework.http.converter.HttpMessageConverter;
 import org.springframework.stereotype.Controller;
+import org.springframework.util.ClassUtils;
 import org.springframework.util.ObjectUtils;
 import org.springframework.web.bind.annotation.ControllerAdvice;
 import org.springframework.web.method.support.HandlerMethodArgumentResolver;
@@ -45,6 +46,9 @@ import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
  */
 class WebMvcTypeExcludeFilter extends AnnotationCustomizableTypeExcludeFilter {
 
+	private static final String[] OPTIONAL_INCLUDES = {
+			"org.springframework.security.config.annotation.web.WebSecurityConfigurer" };
+
 	private static final Set<Class<?>> DEFAULT_INCLUDES;
 
 	static {
@@ -60,6 +64,13 @@ class WebMvcTypeExcludeFilter extends AnnotationCustomizableTypeExcludeFilter {
 		includes.add(ErrorAttributes.class);
 		includes.add(Converter.class);
 		includes.add(GenericConverter.class);
+		for (String optionalInclude : OPTIONAL_INCLUDES) {
+			try {
+				includes.add(ClassUtils.forName(optionalInclude, null));
+			}
+			catch (Exception ex) {
+			}
+		}
 		DEFAULT_INCLUDES = Collections.unmodifiableSet(includes);
 	}
 

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2017 the original author or authors.
+ * Copyright 2012-2018 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -26,6 +26,7 @@ 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.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
 import org.springframework.stereotype.Controller;
 import org.springframework.stereotype.Repository;
 import org.springframework.stereotype.Service;
@@ -54,6 +55,7 @@ public class WebMvcTypeExcludeFilterTests {
 		assertThat(excludes(filter, ExampleMessageConverter.class)).isFalse();
 		assertThat(excludes(filter, ExampleService.class)).isTrue();
 		assertThat(excludes(filter, ExampleRepository.class)).isTrue();
+		assertThat(excludes(filter, ExampleWebSecurityConfigurer.class)).isFalse();
 	}
 
 	@Test
@@ -67,6 +69,7 @@ public class WebMvcTypeExcludeFilterTests {
 		assertThat(excludes(filter, ExampleMessageConverter.class)).isFalse();
 		assertThat(excludes(filter, ExampleService.class)).isTrue();
 		assertThat(excludes(filter, ExampleRepository.class)).isTrue();
+		assertThat(excludes(filter, ExampleWebSecurityConfigurer.class)).isFalse();
 	}
 
 	@Test
@@ -80,6 +83,7 @@ public class WebMvcTypeExcludeFilterTests {
 		assertThat(excludes(filter, ExampleMessageConverter.class)).isTrue();
 		assertThat(excludes(filter, ExampleService.class)).isTrue();
 		assertThat(excludes(filter, ExampleRepository.class)).isTrue();
+		assertThat(excludes(filter, ExampleWebSecurityConfigurer.class)).isTrue();
 	}
 
 	@Test
@@ -106,6 +110,7 @@ public class WebMvcTypeExcludeFilterTests {
 		assertThat(excludes(filter, ExampleMessageConverter.class)).isFalse();
 		assertThat(excludes(filter, ExampleService.class)).isTrue();
 		assertThat(excludes(filter, ExampleRepository.class)).isTrue();
+		assertThat(excludes(filter, ExampleWebSecurityConfigurer.class)).isFalse();
 	}
 
 	private boolean excludes(WebMvcTypeExcludeFilter filter, Class<?> type)
@@ -173,4 +178,8 @@ public class WebMvcTypeExcludeFilterTests {
 
 	}
 
+	static class ExampleWebSecurityConfigurer extends WebSecurityConfigurerAdapter {
+
+	}
+
 }