Add RenderingResponse integration test

This commit adds an integration test for the `RenderingResponse`.

spring-webflux/src/test/java/org/springframework/web/reactive/function/server/AbstractRouterFunctionIntegrationTests.java

@@ -27,9 +27,13 @@ public abstract class AbstractRouterFunctionIntegrationTests extends AbstractHtt
 	@Override
 	protected final HttpHandler createHttpHandler() {
 		RouterFunction<?> routerFunction = routerFunction();
-		return RouterFunctions.toHttpHandler(routerFunction);
+		return RouterFunctions.toHttpHandler(routerFunction, handlerStrategies());
 	}
 
 	protected abstract RouterFunction<?> routerFunction();
 
+	protected HandlerStrategies handlerStrategies() {
+		return HandlerStrategies.withDefaults();
+	}
+
 }

spring-webflux/src/test/java/org/springframework/web/reactive/function/server/RenderingResponseIntegrationTests.java

@@ -0,0 +1,166 @@
+/*
+ * Copyright 2002-2017 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.function.server;
+
+import java.nio.charset.StandardCharsets;
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Locale;
+import java.util.Map;
+
+import org.junit.Test;
+import reactor.core.publisher.Mono;
+
+import org.springframework.core.io.buffer.DataBuffer;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.MediaType;
+import org.springframework.http.ResponseEntity;
+import org.springframework.http.server.reactive.ServerHttpResponse;
+import org.springframework.web.client.RestTemplate;
+import org.springframework.web.reactive.result.view.View;
+import org.springframework.web.reactive.result.view.ViewResolver;
+import org.springframework.web.server.ServerWebExchange;
+
+import static org.junit.Assert.*;
+import static org.springframework.web.reactive.function.server.HandlerFilterFunction.ofResponseProcessor;
+import static org.springframework.web.reactive.function.server.RequestPredicates.GET;
+import static org.springframework.web.reactive.function.server.RouterFunctions.route;
+
+/**
+ * @author Arjen Poutsma
+ * @since 5.0
+ */
+public class RenderingResponseIntegrationTests extends AbstractRouterFunctionIntegrationTests {
+
+	private final RestTemplate restTemplate = new RestTemplate();
+
+
+	@Override
+	protected RouterFunction<?> routerFunction() {
+		RenderingResponseHandler handler = new RenderingResponseHandler();
+		RouterFunction<RenderingResponse> normalRoute = route(GET("/normal"), handler::render);
+		RouterFunction<RenderingResponse> filteredRoute = route(GET("/filter"), handler::render)
+				.filter(ofResponseProcessor(
+						response -> {
+							Map<String, Object> model = new LinkedHashMap<>(response.model());
+							model.put("qux", "quux");
+
+							return RenderingResponse.create(response.name())
+									.modelAttributes(model)
+									.build();
+						}));
+
+		return normalRoute.and(filteredRoute);
+	}
+
+	@Override
+	protected HandlerStrategies handlerStrategies() {
+		return HandlerStrategies.builder()
+				.viewResolver(new DummyViewResolver())
+				.build();
+
+	}
+
+	@Test
+	public void normal() throws Exception {
+		ResponseEntity<String> result =
+				restTemplate.getForEntity("http://localhost:" + port + "/normal", String.class);
+
+		assertEquals(HttpStatus.OK, result.getStatusCode());
+		Map<String, String> body = parseBody(result.getBody());
+		assertEquals(2, body.size());
+		assertEquals("foo", body.get("name"));
+		assertEquals("baz", body.get("bar"));
+	}
+
+	@Test
+	public void filter() throws Exception {
+		ResponseEntity<String> result =
+				restTemplate.getForEntity("http://localhost:" + port + "/filter", String.class);
+
+		assertEquals(HttpStatus.OK, result.getStatusCode());
+		Map<String, String> body = parseBody(result.getBody());
+		assertEquals(3, body.size());
+		assertEquals("foo", body.get("name"));
+		assertEquals("baz", body.get("bar"));
+		assertEquals("quux", body.get("qux"));
+	}
+
+	private Map<String, String> parseBody(String body) {
+		String[] lines = body.split("\\n");
+		Map<String, String> result = new LinkedHashMap<>(lines.length);
+		for (String line : lines) {
+			int idx = line.indexOf('=');
+			String key = line.substring(0, idx);
+			String value = line.substring(idx + 1);
+			result.put(key, value);
+		}
+		return result;
+	}
+
+	private static class RenderingResponseHandler {
+
+		public Mono<RenderingResponse> render(ServerRequest request) {
+			return RenderingResponse.create("foo")
+					.modelAttribute("bar", "baz")
+					.build();
+		}
+
+	}
+
+	private static class DummyViewResolver implements ViewResolver {
+
+		@Override
+		public Mono<View> resolveViewName(String viewName, Locale locale) {
+			return Mono.just(new DummyView(viewName));
+		}
+	}
+
+
+	private static class DummyView implements View {
+
+		private final String name;
+
+		public DummyView(String name) {
+			this.name = name;
+		}
+
+		@Override
+		public List<MediaType> getSupportedMediaTypes() {
+			return Collections.emptyList();
+		}
+
+		@Override
+		public Mono<Void> render(Map<String, ?> model, MediaType contentType,
+				ServerWebExchange exchange) {
+			StringBuilder builder = new StringBuilder();
+			builder.append("name=").append(this.name).append('\n');
+			for (Map.Entry<String, ?> entry : model.entrySet()) {
+				builder.append(entry.getKey()).append('=').append(entry.getValue()).append('\n');
+			}
+			builder.setLength(builder.length() - 1);
+			byte[] bytes = builder.toString().getBytes(StandardCharsets.UTF_8);
+
+			ServerHttpResponse response = exchange.getResponse();
+			DataBuffer buffer = response.bufferFactory().wrap(bytes);
+			response.getHeaders().setContentType(MediaType.TEXT_PLAIN);
+			return response.writeWith(Mono.just(buffer));
+		}
+	}
+
+}