Add support for using WebFlux's WebTestClient to document an API

Closes gh-384

docs/src/test/java/com/example/webtestclient/PathParameters.java

@@ -0,0 +1,42 @@
+/*
+ * Copyright 2014-2017 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 com.example.webtestclient;
+
+import org.springframework.test.web.reactive.server.WebTestClient;
+
+import static org.springframework.restdocs.request.RequestDocumentation.parameterWithName;
+import static org.springframework.restdocs.request.RequestDocumentation.pathParameters;
+import static org.springframework.restdocs.webtestclient.WebTestClientRestDocumentation.document;
+
+public class PathParameters {
+
+	// @formatter:off
+
+	private WebTestClient webTestClient;
+
+	public void pathParametersSnippet() throws Exception {
+		// tag::path-parameters[]
+		this.webTestClient.get().uri("/locations/{latitude}/{longitude}", 51.5072, 0.1275) // <1>
+			.exchange().expectStatus().isOk().expectBody()
+			.consumeWith(document("locations",
+				pathParameters( // <2>
+					parameterWithName("latitude").description("The location's latitude"), // <3>
+					parameterWithName("longitude").description("The location's longitude")))); // <4>
+		// end::path-parameters[]
+	}
+
+}