MockMvc allows HttpMethod input for multipart request

Closes gh-28545

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2020 the original author or authors.
+ * Copyright 2002-2022 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.
@@ -39,8 +39,8 @@ import org.springframework.test.web.reactive.server.EntityExchangeResult;
 import org.springframework.test.web.reactive.server.WebTestClient;
 import org.springframework.test.web.servlet.client.MockMvcWebTestClient;
 import org.springframework.ui.Model;
-import org.springframework.web.bind.annotation.RequestMapping;
-import org.springframework.web.bind.annotation.RequestMethod;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.PutMapping;
 import org.springframework.web.bind.annotation.RequestParam;
 import org.springframework.web.bind.annotation.RequestPart;
 import org.springframework.web.filter.OncePerRequestFilter;
@@ -80,6 +80,18 @@ public class MultipartControllerTests {
 		MockMvcWebTestClient.resultActionsFor(exchangeResult)
 				.andExpect(model().attribute("fileContent", fileContent))
 				.andExpect(model().attribute("jsonContent", json));
+
+		// Now try the same with HTTP PUT
+		exchangeResult = testClient.put().uri("/multipartfile-via-put")
+				.bodyValue(bodyBuilder.build())
+				.exchange()
+				.expectStatus().isFound()
+				.expectBody().isEmpty();
+
+		// Further assertions on the server response
+		MockMvcWebTestClient.resultActionsFor(exchangeResult)
+				.andExpect(model().attribute("fileContent", fileContent))
+				.andExpect(model().attribute("jsonContent", json));
 	}
 
 	@Test
@@ -284,10 +296,11 @@ public class MultipartControllerTests {
 	}
 
 
+	@SuppressWarnings("OptionalUsedAsFieldOrParameterType")
 	@Controller
 	private static class MultipartController {
 
-		@RequestMapping(value = "/multipartfile", method = RequestMethod.POST)
+		@PostMapping("/multipartfile")
 		public String processMultipartFile(@RequestParam(required = false) MultipartFile file,
 				@RequestPart(required = false) Map<String, String> json, Model model) throws IOException {
 
@@ -301,7 +314,14 @@ public class MultipartControllerTests {
 			return "redirect:/index";
 		}
 
-		@RequestMapping(value = "/multipartfilearray", method = RequestMethod.POST)
+		@PutMapping("/multipartfile-via-put")
+		public String processMultipartFileViaHttpPut(@RequestParam(required = false) MultipartFile file,
+				@RequestPart(required = false) Map<String, String> json, Model model) throws IOException {
+
+			return processMultipartFile(file, json, model);
+		}
+
+		@PostMapping("/multipartfilearray")
 		public String processMultipartFileArray(@RequestParam(required = false) MultipartFile[] file,
 				@RequestPart(required = false) Map<String, String> json, Model model) throws IOException {
 
@@ -317,7 +337,7 @@ public class MultipartControllerTests {
 			return "redirect:/index";
 		}
 
-		@RequestMapping(value = "/multipartfilelist", method = RequestMethod.POST)
+		@PostMapping("/multipartfilelist")
 		public String processMultipartFileList(@RequestParam(required = false) List<MultipartFile> file,
 				@RequestPart(required = false) Map<String, String> json, Model model) throws IOException {
 
@@ -333,7 +353,7 @@ public class MultipartControllerTests {
 			return "redirect:/index";
 		}
 
-		@RequestMapping(value = "/optionalfile", method = RequestMethod.POST)
+		@PostMapping("/optionalfile")
 		public String processOptionalFile(@RequestParam Optional<MultipartFile> file,
 				@RequestPart Map<String, String> json, Model model) throws IOException {
 
@@ -345,7 +365,7 @@ public class MultipartControllerTests {
 			return "redirect:/index";
 		}
 
-		@RequestMapping(value = "/optionalfilearray", method = RequestMethod.POST)
+		@PostMapping("/optionalfilearray")
 		public String processOptionalFileArray(@RequestParam Optional<MultipartFile[]> file,
 				@RequestPart Map<String, String> json, Model model) throws IOException {
 
@@ -359,7 +379,7 @@ public class MultipartControllerTests {
 			return "redirect:/index";
 		}
 
-		@RequestMapping(value = "/optionalfilelist", method = RequestMethod.POST)
+		@PostMapping("/optionalfilelist")
 		public String processOptionalFileList(@RequestParam Optional<List<MultipartFile>> file,
 				@RequestPart Map<String, String> json, Model model) throws IOException {
 
@@ -373,7 +393,7 @@ public class MultipartControllerTests {
 			return "redirect:/index";
 		}
 
-		@RequestMapping(value = "/part", method = RequestMethod.POST)
+		@PostMapping("/part")
 		public String processPart(@RequestParam Part part,
 				@RequestPart Map<String, String> json, Model model) throws IOException {
 
@@ -383,7 +403,7 @@ public class MultipartControllerTests {
 			return "redirect:/index";
 		}
 
-		@RequestMapping(value = "/json", method = RequestMethod.POST)
+		@PostMapping("/json")
 		public String processMultipart(@RequestPart Map<String, String> json, Model model) {
 			model.addAttribute("json", json);
 			return "redirect:/index";