Complete initialization with bindToRouterFunction

Issue: SPR-17239

spring-test/src/test/java/org/springframework/test/web/reactive/server/DefaultRouterFunctionSpecTests.java

@@ -0,0 +1,75 @@
+/*
+ * 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.test.web.reactive.server;
+
+import org.junit.Test;
+import reactor.core.publisher.Mono;
+
+import org.springframework.http.HttpStatus;
+import org.springframework.web.reactive.function.server.HandlerStrategies;
+import org.springframework.web.reactive.function.server.RouterFunction;
+import org.springframework.web.reactive.function.server.RouterFunctions;
+import org.springframework.web.reactive.function.server.ServerResponse;
+
+/**
+ * Unit tests for {@link DefaultRouterFunctionSpec}.
+ * @author Rossen Stoyanchev
+ */
+public class DefaultRouterFunctionSpecTests {
+
+	@Test
+	public void webFilter() {
+
+		RouterFunction<ServerResponse> routerFunction = RouterFunctions.route()
+				.GET("/", request -> ServerResponse.ok().build())
+				.build();
+
+		new DefaultRouterFunctionSpec(routerFunction)
+				.handlerStrategies(HandlerStrategies.builder()
+						.webFilter((exchange, chain) -> {
+							exchange.getResponse().getHeaders().set("foo", "123");
+							return chain.filter(exchange);
+						})
+						.build())
+				.build()
+				.get()
+				.uri("/")
+				.exchange()
+				.expectStatus().isOk()
+				.expectHeader().valueEquals("foo", "123");
+	}
+
+	@Test
+	public void exceptionHandler() {
+
+		RouterFunction<ServerResponse> routerFunction = RouterFunctions.route()
+				.GET("/error", request -> Mono.error(new IllegalStateException("boo")))
+				.build();
+
+		new DefaultRouterFunctionSpec(routerFunction)
+				.handlerStrategies(HandlerStrategies.builder()
+						.exceptionHandler((exchange, ex) -> {
+							exchange.getResponse().setStatusCode(HttpStatus.BAD_REQUEST);
+							return Mono.empty();
+						})
+						.build())
+				.build()
+				.get()
+				.uri("/error")
+				.exchange()
+				.expectStatus().isBadRequest();
+	}
+}