add test

Author: Puppy4C

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/endpoint/web/documentation/MappingsEndpointServletDocumentationTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2024 the original author or authors.
+ * Copyright 2012-2025 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.
@@ -47,13 +47,17 @@
 import org.springframework.test.web.reactive.server.WebTestClient;
 import org.springframework.web.bind.annotation.PostMapping;
 import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.servlet.function.RouterFunction;
+import org.springframework.web.servlet.function.RouterFunctions;
+import org.springframework.web.servlet.function.ServerResponse;
 
 import static org.springframework.restdocs.payload.PayloadDocumentation.beneathPath;
 import static org.springframework.restdocs.payload.PayloadDocumentation.fieldWithPath;
 import static org.springframework.restdocs.payload.PayloadDocumentation.responseFields;
 import static org.springframework.restdocs.payload.PayloadDocumentation.subsectionWithPath;
 import static org.springframework.restdocs.webtestclient.WebTestClientRestDocumentation.document;
 import static org.springframework.restdocs.webtestclient.WebTestClientRestDocumentation.documentationConfiguration;
+import static org.springframework.web.servlet.function.RequestPredicates.GET;
 
 /**
  * Tests for generating documentation describing {@link MappingsEndpoint}.
@@ -130,6 +134,13 @@ void mappings() {
 				fieldWithPath("*.[].details.handlerMethod.name").description("Name of the method."),
 				fieldWithPath("*.[].details.handlerMethod.descriptor")
 					.description("Descriptor of the method as specified in the Java Language Specification."));
+		List<FieldDescriptor> handlerFunction = List.of(
+				fieldWithPath("*.[].details.handlerFunction").optional()
+						.type(JsonFieldType.OBJECT)
+						.description("Details of the function, if any, that will handle requests to this mapping."),
+				fieldWithPath("*.[].details.handlerFunction.className").type(JsonFieldType.STRING)
+						.description("Fully qualified name of the class of the function."));
+		dispatcherServletFields.addAll(handlerFunction);
 		dispatcherServletFields.addAll(handlerMethod);
 		dispatcherServletFields.addAll(requestMappingConditions);
 		this.client.get()
@@ -192,6 +203,11 @@ ExampleController exampleController() {
 			return new ExampleController();
 		}
 
+		@Bean
+		RouterFunction<ServerResponse> exampleRouter() {
+			return RouterFunctions.route(GET("/foo"), (request) -> ServerResponse.ok().build());
+		}
+
 	}
 
 	@RestController