Add API versioning to RestTestClient

See gh-34428

spring-test/src/main/java/org/springframework/test/web/servlet/client/DefaultRestTestClient.java

@@ -226,6 +226,12 @@ class DefaultRestTestClient implements RestTestClient {
 			return this;
 		}
 
+		@Override
+		public RequestBodySpec apiVersion(Object version) {
+			this.requestHeadersUriSpec.apiVersion(version);
+			return this;
+		}
+
 		@Override
 		public RequestHeadersSpec<?> body(Object body) {
 			this.requestHeadersUriSpec.body(body);
@@ -235,8 +241,8 @@ class DefaultRestTestClient implements RestTestClient {
 		@Override
 		public ResponseSpec exchange() {
 			return new DefaultResponseSpec(
-					this.requestHeadersUriSpec.exchangeForRequiredValue((request, response) ->
-							new ExchangeResult(request, response, this.uriTemplate), false));
+					this.requestHeadersUriSpec.exchangeForRequiredValue(
+							(request, response) -> new ExchangeResult(request, response, this.uriTemplate), false));
 		}
 	}
 

spring-test/src/main/java/org/springframework/test/web/servlet/client/DefaultRestTestClientBuilder.java

@@ -31,6 +31,7 @@ import org.springframework.test.web.servlet.setup.MockMvcBuilders;
 import org.springframework.test.web.servlet.setup.RouterFunctionMockMvcBuilder;
 import org.springframework.test.web.servlet.setup.StandaloneMockMvcBuilder;
 import org.springframework.util.MultiValueMap;
+import org.springframework.web.client.ApiVersionInserter;
 import org.springframework.web.client.RestClient;
 import org.springframework.web.context.WebApplicationContext;
 import org.springframework.web.servlet.function.RouterFunction;
@@ -94,6 +95,18 @@ class DefaultRestTestClientBuilder<B extends RestTestClient.Builder<B>> implemen
 		return self();
 	}
 
+	@Override
+	public <T extends B> T defaultApiVersion(Object version) {
+		this.restClientBuilder.defaultApiVersion(version);
+		return self();
+	}
+
+	@Override
+	public <T extends B> T apiVersionInserter(ApiVersionInserter apiVersionInserter) {
+		this.restClientBuilder.apiVersionInserter(apiVersionInserter);
+		return self();
+	}
+
 	@SuppressWarnings("unchecked")
 	protected <T extends B> T self() {
 		return (T) this;

spring-test/src/main/java/org/springframework/test/web/servlet/client/RestTestClient.java

@@ -41,6 +41,8 @@ import org.springframework.test.web.servlet.setup.MockMvcBuilders;
 import org.springframework.test.web.servlet.setup.RouterFunctionMockMvcBuilder;
 import org.springframework.test.web.servlet.setup.StandaloneMockMvcBuilder;
 import org.springframework.util.MultiValueMap;
+import org.springframework.web.client.ApiVersionFormatter;
+import org.springframework.web.client.ApiVersionInserter;
 import org.springframework.web.client.RestClient;
 import org.springframework.web.context.WebApplicationContext;
 import org.springframework.web.servlet.function.RouterFunction;
@@ -241,6 +243,24 @@ public interface RestTestClient {
 		 */
 		<T extends B> T defaultCookies(Consumer<MultiValueMap<String, String>> cookiesConsumer);
 
+		/**
+		 * Global option to specify an API version to add to every request,
+		 * if not already set.
+		 * @param version the version to use
+		 * @return this builder
+		 * @since 7.0
+		 */
+		<T extends B> T defaultApiVersion(Object version);
+
+		/**
+		 * Configure an {@link ApiVersionInserter} to abstract how an API version
+		 * specified via {@link RequestHeadersSpec#apiVersion(Object)}
+		 * is inserted into the request.
+		 * @param apiVersionInserter the inserter to use
+		 * @since 7.0
+		 */
+		<T extends B> T apiVersionInserter(ApiVersionInserter apiVersionInserter);
+
 		/**
 		 * Build the {@link RestTestClient} instance.
 		 */
@@ -403,6 +423,17 @@ public interface RestTestClient {
 		 */
 		S headers(Consumer<HttpHeaders> headersConsumer);
 
+		/**
+		 * Set an API version for the request. The version is inserted into the
+		 * request by the {@linkplain Builder#apiVersionInserter(ApiVersionInserter)
+		 * configured} {@code ApiVersionInserter}.
+		 * @param version the API version of the request; this can be a String or
+		 * some Object that can be formatted by the inserter &mdash; for example,
+		 * through an {@link ApiVersionFormatter}
+		 * @since 7.0
+		 */
+		S apiVersion(Object version);
+
 		/**
 		 * Set the attribute with the given name to the given value.
 		 * @param name the name of the attribute to add

spring-test/src/test/java/org/springframework/test/web/servlet/client/samples/ApiVersionTests.java

@@ -0,0 +1,110 @@
+/*
+ * Copyright 2002-present 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 org.springframework.test.web.servlet.client.samples;
+
+
+import java.util.List;
+import java.util.Map;
+
+import jakarta.servlet.http.HttpServletRequest;
+import org.junit.jupiter.api.Test;
+
+import org.springframework.http.MediaType;
+import org.springframework.test.web.servlet.client.RestTestClient;
+import org.springframework.web.accept.ApiVersionResolver;
+import org.springframework.web.accept.DefaultApiVersionStrategy;
+import org.springframework.web.accept.PathApiVersionResolver;
+import org.springframework.web.accept.SemanticApiVersionParser;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.client.ApiVersionInserter;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * {@link RestTestClient} tests for sending API versions.
+ *
+ * @author Rossen Stoyanchev
+ */
+public class ApiVersionTests {
+
+	@Test
+	void header() {
+		String header = "X-API-Version";
+
+		Map<String, String> result = performRequest(
+				request -> request.getHeader(header), ApiVersionInserter.useHeader(header));
+
+		assertThat(result.get(header)).isEqualTo("1.2");
+	}
+
+	@Test
+	void queryParam() {
+		String param = "api-version";
+
+		Map<String, String> result = performRequest(
+				request -> request.getParameter(param), ApiVersionInserter.useQueryParam(param));
+
+		assertThat(result.get("query")).isEqualTo(param + "=1.2");
+	}
+
+	@Test
+	void pathSegment() {
+		Map<String, String> result = performRequest(
+				new PathApiVersionResolver(0), ApiVersionInserter.usePathSegment(0));
+
+		assertThat(result.get("path")).isEqualTo("/1.2/path");
+	}
+
+	@SuppressWarnings("unchecked")
+	private Map<String, String> performRequest(
+			ApiVersionResolver versionResolver, ApiVersionInserter inserter) {
+
+		DefaultApiVersionStrategy versionStrategy = new DefaultApiVersionStrategy(
+				List.of(versionResolver), new SemanticApiVersionParser(),
+				true, null, true, null);
+
+		RestTestClient client = RestTestClient.bindToController(new TestController())
+				.configureServer(mockMvcBuilder -> mockMvcBuilder.setApiVersionStrategy(versionStrategy))
+				.baseUrl("/path")
+				.apiVersionInserter(inserter)
+				.build();
+
+		return client.get()
+				.accept(MediaType.APPLICATION_JSON)
+				.apiVersion(1.2)
+				.exchange()
+				.returnResult(Map.class)
+				.getResponseBody();
+	}
+
+
+	@RestController
+	static class TestController {
+
+		private static final String HEADER = "X-API-Version";
+
+		@GetMapping(path = "/**", version = "1.2")
+		Map<String, String> handle(HttpServletRequest request) {
+			String query = request.getQueryString();
+			String versionHeader = request.getHeader(HEADER);
+			return Map.of("path", request.getRequestURI(),
+					"query", (query != null ? query : ""),
+					HEADER, (versionHeader != null ? versionHeader : ""));
+		}
+	}
+}