Adding tests for ValidationActionFilter

MainProject/Core/Filters/ValidationActionFilter.cs

@@ -1,3 +1,4 @@
+using BasicDotnetTemplate.MainProject.Models.Api.Base;
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.AspNetCore.Mvc.Filters;
 using System.Threading.Tasks;
@@ -12,15 +13,27 @@ namespace BasicDotnetTemplate.MainProject.Core.Filters
         {
             if (!context.ModelState.IsValid)
             {
-                context.Result = new BadRequestObjectResult(new { message = _requestNotWellFormedMessage, errors = context.ModelState });
+                context.Result = new BadRequestObjectResult(new ValidationError
+                {
+                    Message = _requestNotWellFormedMessage,
+                    Errors = context.ModelState.Where(m =>
+                        m.Value != null && m.Value.Errors.Any())
+                        .ToDictionary(
+                            m => m.Key,
+                            m => m.Value!.Errors.Select(e => e.ErrorMessage).ToList()
+                        )
+                });
                 return;
             }
 
-            var requestBody = context.ActionArguments.Values.FirstOrDefault(arg => arg != null && !arg.GetType().IsPrimitive && !(arg is string));
+            var requestBody = context.ActionArguments.Values.FirstOrDefault(arg => arg != null && !arg.GetType().IsPrimitive && arg is not string);
 
             if (requestBody == null)
             {
-                context.Result = new BadRequestObjectResult(new { message = _requestNotWellFormedMessage });
+                context.Result = new BadRequestObjectResult(new ValidationError
+                {
+                    Message = _requestNotWellFormedMessage
+                });
                 return;
             }
 

MainProject/Models/Api/Base/ValidationError.cs

@@ -0,0 +1,9 @@
+using System;
+
+namespace BasicDotnetTemplate.MainProject.Models.Api.Base;
+
+public class ValidationError
+{
+    public string Message { get; set; }
+    public Dictionary<string, List<string>> Errors { get; set; }
+}