feat: Add TimeoutException as default mapped exception to 504 status code

Author: NelsonBN

samples/PowerUtils.AspNetCore.ErrorHandler.Samples/Controllers/ExceptionsController.cs

@@ -44,5 +44,9 @@ public IActionResult TestException()
         [HttpGet("custom-exception")]
         public IActionResult CustomException()
             => throw new CustomException();
+
+        [HttpGet("timeout-exception")]
+        public IActionResult TimeoutException()
+            => throw new TimeoutException();
     }
 }

src/ErrorHandlerOptions.cs

@@ -31,13 +31,23 @@ public class ErrorHandlerOptions
         public IDictionary<Type, IExceptionMapper> ExceptionMappers { get; set; } = new Dictionary<Type, IExceptionMapper>();
 
         public ErrorHandlerOptions()
-            => ExceptionMappers.Add(
+        {
+            ExceptionMappers.Add(
                 typeof(NotImplementedException),
                 new ExceptionMapper<NotImplementedException>()
                 {
                     Handler = (_) => (StatusCodes.Status501NotImplemented, new Dictionary<string, string>())
                 }
             );
+
+            ExceptionMappers.Add(
+                typeof(TimeoutException),
+                new ExceptionMapper<TimeoutException>()
+                {
+                    Handler = (_) => (StatusCodes.Status504GatewayTimeout, new Dictionary<string, string>())
+                }
+            );
+        }
     }
 
     public static class ErrorHandlerOptionsExtensions

tests/PowerUtils.AspNetCore.ErrorHandler.Tests/Tests/Controllers/ExceptionsControllerTests.cs

@@ -204,5 +204,28 @@ public async void CustomExcetionWithSpecificTitleAndLink_Request_582()
             content.Title.Should()
                 .Be("CustomTitle");
         }
+
+        [Fact]
+        public async void EndpointWithTimeoutException_Request_504StatusCode()
+        {
+            // Arrange
+            var requestUri = "/exceptions/timeout-exception";
+            var options = _testsFixture.GetService<IOptions<ApiBehaviorOptions>>();
+
+
+            // Act
+            (var response, var content) = await _testsFixture.Client.SendGetAsync(requestUri);
+            options.Value.ClientErrorMapping.TryGetValue((int)response.StatusCode, out var clientErrorData);
+
+
+            // Assert
+            response.ValidateResponse(HttpStatusCode.GatewayTimeout);
+
+            content.ValidateContent(
+                HttpStatusCode.GatewayTimeout,
+                clientErrorData,
+                "GET: " + requestUri
+            );
+        }
     }
 }