Using WriteJsonAsync<object?> operation for ProblemHttpResult (#41670)

* Using non-generic Write operation for ProblemHttpResult

* Update unit tests

* Removing ThrowIfNull

* PR Feedback

Author: brunolins16

src/Http/Http.Results/src/ProblemHttpResult.cs

@@ -53,7 +53,7 @@ public Task ExecuteAsync(HttpContext httpContext)
             httpContext.Response.StatusCode = code;
         }
 
-        return HttpResultsHelper.WriteResultAsJsonAsync(
+        return HttpResultsHelper.WriteResultAsJsonAsync<object?>(
                 httpContext,
                 logger,
                 value: ProblemDetails,

src/Http/Http.Results/test/ProblemResultTests.cs

@@ -69,6 +69,38 @@ public async Task ExecuteAsync_UsesDefaults_ForValidationProblemDetails()
         Assert.Equal(StatusCodes.Status400BadRequest, responseDetails.Status);
     }
 
+    [Fact]
+    public async Task ExecuteAsync_IncludeErrors_ForValidationProblemDetails()
+    {
+        // Arrange
+        var details = new HttpValidationProblemDetails(new Dictionary<string, string[]>
+        {
+            { "testError", new string[] { "message" } }
+        });
+
+        var result = new ProblemHttpResult(details);
+        var stream = new MemoryStream();
+        var httpContext = new DefaultHttpContext()
+        {
+            RequestServices = CreateServices(),
+            Response =
+                {
+                    Body = stream,
+                },
+        };
+
+        // Act
+        await result.ExecuteAsync(httpContext);
+
+        // Assert
+        Assert.Equal(StatusCodes.Status400BadRequest, httpContext.Response.StatusCode);
+        stream.Position = 0;
+        var responseDetails = JsonSerializer.Deserialize<HttpValidationProblemDetails>(stream);
+        Assert.Equal(StatusCodes.Status400BadRequest, responseDetails.Status);
+        var error = Assert.Single(responseDetails.Errors);
+        Assert.Equal("testError", error.Key);
+    }
+
     [Fact]
     public async Task ExecuteAsync_GetsStatusCodeFromProblemDetails()
     {