WebFluxResponseStatusExceptionHandler for @ResponseStatus introspection

The web.server package is quite low-level and should not depend on web.bind in order to avoid a dependency cycle. Extracting the introspection of the ResponseStatus annotation into a WebFlux-level subclass resolves the cycle.

Issue: SPR-16567

spring-webflux/src/test/java/org/springframework/web/reactive/handler/WebFluxResponseStatusExceptionHandlerTests.java

@@ -0,0 +1,65 @@
+/*
+ * Copyright 2002-2018 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.web.reactive.handler;
+
+import java.time.Duration;
+
+import org.junit.Test;
+
+import org.springframework.http.HttpStatus;
+import org.springframework.web.bind.annotation.ResponseStatus;
+import org.springframework.web.reactive.handler.WebFluxResponseStatusExceptionHandler;
+import org.springframework.web.server.handler.ResponseStatusExceptionHandler;
+import org.springframework.web.server.handler.ResponseStatusExceptionHandlerTests;
+
+import static org.junit.Assert.*;
+
+/**
+ * Unit tests for {@link WebFluxResponseStatusExceptionHandler}.
+ *
+ * @author Juergen Hoeller
+ * @author Rossen Stoyanchev
+ */
+public class WebFluxResponseStatusExceptionHandlerTests extends ResponseStatusExceptionHandlerTests {
+
+	@Override
+	protected ResponseStatusExceptionHandler createResponseStatusExceptionHandler() {
+		return new WebFluxResponseStatusExceptionHandler();
+	}
+
+
+	@Test
+	public void handleAnnotatedException() {
+		Throwable ex = new CustomException();
+		this.handler.handle(this.exchange, ex).block(Duration.ofSeconds(5));
+		assertEquals(HttpStatus.I_AM_A_TEAPOT, this.exchange.getResponse().getStatusCode());
+	}
+
+	@Test
+	public void handleNestedAnnotatedException() {
+		Throwable ex = new Exception(new CustomException());
+		this.handler.handle(this.exchange, ex).block(Duration.ofSeconds(5));
+		assertEquals(HttpStatus.I_AM_A_TEAPOT, this.exchange.getResponse().getStatusCode());
+	}
+
+
+	@SuppressWarnings("serial")
+	@ResponseStatus(HttpStatus.I_AM_A_TEAPOT)
+	private static class CustomException extends Exception {
+	}
+
+}