Method level only, empty RequestMapping matches "" and "/"

Closes gh-30293

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2022 the original author or authors.
+ * Copyright 2002-2023 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.
@@ -48,15 +48,12 @@ public class DefaultControllerSpecTests {
 				.exchange()
 				.expectStatus().isOk()
 				.expectBody(String.class).isEqualTo("Success");
-	}
 
-	@Test
-	public void controllerEmptyPath() {
 		new DefaultControllerSpec(new MyController()).build()
 				.get().uri("")
 				.exchange()
 				.expectStatus().isOk()
-				.expectBody(String.class).isEqualTo("Success empty path");
+				.expectBody(String.class).isEqualTo("Success");
 	}
 
 	@Test
@@ -121,19 +118,15 @@ public class DefaultControllerSpecTests {
 	}
 
 
+	@SuppressWarnings("unused")
 	@RestController
 	private static class MyController {
 
-		@GetMapping("/")
+		@GetMapping
 		public String handleRootPath() {
 			return "Success";
 		}
 
-		@GetMapping
-		public String handleEmptyPath() {
-			return "Success empty path";
-		}
-
 		@GetMapping("/exception")
 		public void handleWithError() {
 			throw new IllegalStateException();