Add Encoding to multiple files and JSON payloads request test case. Fixes #2649

Author: buzzerrookie

springdoc-openapi-starter-webmvc-api/src/test/java/test/org/springdoc/api/v30/app119/HelloController.java

@@ -27,6 +27,8 @@
 import io.swagger.v3.oas.annotations.Operation;
 import io.swagger.v3.oas.annotations.Parameter;
 import io.swagger.v3.oas.annotations.media.Content;
+import io.swagger.v3.oas.annotations.media.Encoding;
+import io.swagger.v3.oas.annotations.parameters.RequestBody;
 
 import org.springframework.http.MediaType;
 import org.springframework.web.bind.annotation.PostMapping;
@@ -44,7 +46,8 @@ public class HelloController {
 			produces = MediaType.TEXT_PLAIN_VALUE)
 	public String multiFilesInMultiPart(
 			@RequestPart("params")
-			@Parameter(
+			@RequestBody(content = @Content(encoding = @Encoding(name="params", contentType=MediaType.APPLICATION_JSON_VALUE)))
+            @Parameter(
 					description = "This is the configuration",
 					content = @Content(mediaType = MediaType.APPLICATION_JSON_VALUE)) final JsonRequest jsonRequest,
 			@RequestPart(value = "file1", required = false) @Parameter(description = "This is file1") final MultipartFile file1,

springdoc-openapi-starter-webmvc-api/src/test/resources/results/3.0.1/app119.json

@@ -41,6 +41,11 @@
                     "$ref": "#/components/schemas/JsonRequest"
                   }
                 }
+              },
+              "encoding": {
+                "params": {
+                  "contentType": "application/json"
+                }
               }
             }
           }