ResponseStatusExceptionHandler in web.server.handler (plus related polishing)

spring-web/src/test/java/org/springframework/web/server/handler/ResponseStatusExceptionHandlerTests.java

@@ -0,0 +1,80 @@
+/*
+ * Copyright 2002-2016 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.server.handler;
+
+import java.net.URI;
+import java.time.Duration;
+
+import org.junit.Before;
+import org.junit.Test;
+import reactor.core.publisher.Mono;
+
+import org.springframework.http.HttpMethod;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.server.reactive.MockServerHttpRequest;
+import org.springframework.http.server.reactive.MockServerHttpResponse;
+import org.springframework.tests.TestSubscriber;
+import org.springframework.web.server.ResponseStatusException;
+import org.springframework.web.server.ServerWebExchange;
+import org.springframework.web.server.adapter.DefaultServerWebExchange;
+import org.springframework.web.server.session.MockWebSessionManager;
+
+import static org.junit.Assert.*;
+
+/**
+ * Unit tests for {@link ResponseStatusExceptionHandler}.
+ *
+ * @author Rossen Stoyanchev
+ */
+public class ResponseStatusExceptionHandlerTests {
+
+	private ResponseStatusExceptionHandler handler;
+
+	private MockServerHttpResponse response;
+
+	private ServerWebExchange exchange;
+
+
+	@Before
+	public void setUp() throws Exception {
+		this.handler = new ResponseStatusExceptionHandler();
+		this.response = new MockServerHttpResponse();
+		this.exchange = new DefaultServerWebExchange(
+				new MockServerHttpRequest(HttpMethod.GET, new URI("/path")),
+				this.response,
+				new MockWebSessionManager());
+	}
+
+
+	@Test
+	public void handleException() throws Exception {
+		Throwable ex = new ResponseStatusException(HttpStatus.BAD_REQUEST, "");
+		this.handler.handle(this.exchange, ex).block(Duration.ofSeconds(5));
+
+		assertEquals(HttpStatus.BAD_REQUEST, this.response.getStatusCode());
+	}
+
+	@Test
+	public void unresolvedException() throws Exception {
+		Throwable expected = new IllegalStateException();
+		Mono<Void> mono = this.handler.handle(this.exchange, expected);
+
+		TestSubscriber.subscribe(mono)
+				.assertErrorWith(actual -> assertSame(expected, actual));
+	}
+
+}