Support WebExceptionHandler in @WebFluxTest

Closes gh-13627

spring-boot-project/spring-boot-test-autoconfigure/src/main/java/org/springframework/boot/test/autoconfigure/web/reactive/WebFluxTypeExcludeFilter.java

@@ -32,6 +32,7 @@ import org.springframework.stereotype.Controller;
 import org.springframework.util.ObjectUtils;
 import org.springframework.web.bind.annotation.ControllerAdvice;
 import org.springframework.web.reactive.config.WebFluxConfigurer;
+import org.springframework.web.server.WebExceptionHandler;
 
 /**
  * {@link TypeExcludeFilter} for {@link WebFluxTest @WebFluxTest}.
@@ -49,6 +50,7 @@ class WebFluxTypeExcludeFilter extends AnnotationCustomizableTypeExcludeFilter {
 		includes.add(WebFluxConfigurer.class);
 		includes.add(Converter.class);
 		includes.add(GenericConverter.class);
+		includes.add(WebExceptionHandler.class);
 		DEFAULT_INCLUDES = Collections.unmodifiableSet(includes);
 	}
 

spring-boot-project/spring-boot-test-autoconfigure/src/test/java/org/springframework/boot/test/autoconfigure/web/reactive/webclient/ExampleController1.java

@@ -36,4 +36,9 @@ public class ExampleController1 {
 		return Mono.just("one");
 	}
 
+	@GetMapping("/one/error")
+	public Mono<String> error() {
+		throw new RuntimeException("foo");
+	}
+
 }

spring-boot-project/spring-boot-test-autoconfigure/src/test/java/org/springframework/boot/test/autoconfigure/web/reactive/webclient/ExampleWebExceptionHandler.java

@@ -0,0 +1,40 @@
+/*
+ * 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.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.springframework.boot.test.autoconfigure.web.reactive.webclient;
+
+import reactor.core.publisher.Mono;
+
+import org.springframework.boot.test.autoconfigure.web.reactive.WebFluxTest;
+import org.springframework.http.HttpStatus;
+import org.springframework.stereotype.Component;
+import org.springframework.web.server.ServerWebExchange;
+import org.springframework.web.server.WebExceptionHandler;
+
+/**
+ * Example {@link WebExceptionHandler} used with {@link WebFluxTest} tests.
+ *
+ * @author Madhura Bhave
+ */
+@Component
+public class ExampleWebExceptionHandler implements WebExceptionHandler {
+
+	@Override
+	public Mono<Void> handle(ServerWebExchange exchange, Throwable ex) {
+		exchange.getResponse().setStatusCode(HttpStatus.BAD_REQUEST);
+		return exchange.getResponse().setComplete();
+	}
+
+}

spring-boot-project/spring-boot-test-autoconfigure/src/test/java/org/springframework/boot/test/autoconfigure/web/reactive/webclient/WebFluxTestAllControllersIntegrationTests.java

@@ -48,4 +48,9 @@ public class WebFluxTestAllControllersIntegrationTests {
 				.expectBody(String.class).isEqualTo("two");
 	}
 
+	@Test
+	public void webExceptionHandling() {
+		this.webClient.get().uri("/one/error").exchange().expectStatus().isBadRequest();
+	}
+
 }