Document parameterized output with WebTestClient

Closes gh-713

docs/build.gradle

@@ -16,6 +16,7 @@ dependencies {
 	asciidoctorExt("io.spring.asciidoctor:spring-asciidoctor-extensions-block-switch:0.5.0")
 
 	internal(platform(project(":spring-restdocs-platform")))
+	internal(enforcedPlatform("org.springframework:spring-framework-bom:5.3.8"))
 
 	testImplementation(project(":spring-restdocs-mockmvc"))
 	testImplementation(project(":spring-restdocs-restassured"))

docs/src/docs/asciidoc/documenting-your-api.adoc

@@ -1317,8 +1317,8 @@ You can configure which snippets are produced by default. See the
 [[documentating-your-api-parameterized-output-directories]]
 === Using Parameterized Output Directories
 
-When using MockMvc or REST Assured, you can parameterize the output directory used by
-`document`. You cannot parameterize the output directory when using `WebTestClient`.
+When using MockMvc, REST Assured, or `WebTestClient` you can parameterize the output directory used by
+`document`. Parameterizing output with `WebTestClient` requires Spring Framework 5.3.5 or later.
 
 The following parameters are supported:
 
@@ -1368,6 +1368,12 @@ include::{examples-dir}/com/example/mockmvc/ParameterizedOutput.java[tags=parame
 ----
 include::{examples-dir}/com/example/restassured/ParameterizedOutput.java[tags=parameterized-output]
 ----
+
+[source,java,indent=0,role="secondary"]
+.WebTestClient
+----
+include::{examples-dir}/com/example/webtestclient/ParameterizedOutput.java[tags=parameterized-output]
+----
 ====
 
 With this configuration in place, every call to the service you are testing produces

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

@@ -0,0 +1,52 @@
+/*
+ * Copyright 2014-2021 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
+ *
+ *      https://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.junit.Before;
+import org.junit.Rule;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.ApplicationContext;
+import org.springframework.restdocs.JUnitRestDocumentation;
+import org.springframework.test.web.reactive.server.WebTestClient;
+
+import static org.springframework.restdocs.webtestclient.WebTestClientRestDocumentation.document;
+import static org.springframework.restdocs.webtestclient.WebTestClientRestDocumentation.documentationConfiguration;
+
+public class ParameterizedOutput {
+
+	@Rule
+	public final JUnitRestDocumentation restDocumentation = new JUnitRestDocumentation();
+
+	@SuppressWarnings("unused")
+	private WebTestClient webTestClient;
+
+	@Autowired
+	private ApplicationContext context;
+
+	// tag::parameterized-output[]
+	@Before
+	public void setUp() {
+		this.webTestClient = WebTestClient.bindToApplicationContext(this.context)
+				.configureClient()
+				.filter(documentationConfiguration(this.restDocumentation))
+				.entityExchangeResultConsumer(document("{method-name}/{step}"))
+				.build();
+	}
+	// end::parameterized-output[]
+
+}