Add support for configuring default request and response preprocessors

See gh-424

docs/src/test/java/com/example/mockmvc/CustomDefaultOperationPreprocessors.java

@@ -0,0 +1,50 @@
+/*
+ * 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.mockmvc;
+
+import org.junit.Before;
+import org.junit.Rule;
+
+import org.springframework.restdocs.JUnitRestDocumentation;
+import org.springframework.test.web.servlet.MockMvc;
+import org.springframework.test.web.servlet.setup.MockMvcBuilders;
+import org.springframework.web.context.WebApplicationContext;
+
+import static org.springframework.restdocs.mockmvc.MockMvcRestDocumentation.documentationConfiguration;
+import static org.springframework.restdocs.operation.preprocess.Preprocessors.prettyPrint;
+import static org.springframework.restdocs.operation.preprocess.Preprocessors.removeHeaders;
+
+public class CustomDefaultOperationPreprocessors {
+
+	@Rule
+	public final JUnitRestDocumentation restDocumentation = new JUnitRestDocumentation();
+
+	private WebApplicationContext context;
+
+	private MockMvc mockMvc;
+
+	@Before
+	public void setup() {
+		// tag::custom-default-preprocessors[]
+		this.mockMvc = MockMvcBuilders.webAppContextSetup(this.context)
+				.apply(documentationConfiguration(this.restDocumentation).operationPreprocessors()
+						.withDefaultRequestPreprocessors(removeHeaders("Foo"))
+						.withDefaultResponsePreprocessors(prettyPrint()))
+				.build();
+		// end::custom-default-preprocessors[]
+	}
+}