Docs for the WebTestClient AssertJ integration

Closes gh-35737

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

@@ -914,6 +914,17 @@ public interface WebTestClient {
 		 */
 		BodyContentSpec expectBody();
 
+		/**
+		 * Return an {@link ExchangeResult} with the raw content. Effectively, a shortcut for:
+		 * <pre class="code">
+		 * .returnResult(byte[].class)
+		 * </pre>
+		 * @since 7.0
+		 */
+		default ExchangeResult returnResult() {
+			return returnResult(byte[].class);
+		}
+
 		/**
 		 * Exit the chained flow in order to consume the response body externally,
 		 * for example, via {@link reactor.test.StepVerifier}.