resolving nullability warnings

Author: gavinbarron

msgraph-chaos-proxy/ChaosEngine.cs

@@ -295,16 +295,16 @@ private void UpdateProxyResponse(SessionEventArgs e, ResponseComponents response
             }
 
             if ((int)responseComponents.ErrorStatus >= 400 && string.IsNullOrEmpty(responseComponents.Body)) {
-                responseComponents.Body = JsonSerializer.Serialize(new ErrorResponseBody {
-                    Error = new ErrorResponseError {
+                responseComponents.Body = JsonSerializer.Serialize(new ErrorResponseBody(
+                    new ErrorResponseError {
                         Code = new Regex("([A-Z])").Replace(responseComponents.ErrorStatus.ToString(), m => { return $" {m.Groups[1]}"; }).Trim(),
                         Message = "Some error happened",
                         InnerError = new ErrorResponseInnerError {
                             RequestId = responseComponents.RequestId,
                             Date = responseComponents.RequestDate
                         }
-                    }
-                });
+                    })
+                );
             }
             Console.WriteLine($"\t{(matchingResponse is not null ? "Mocked" : "Failed")} {e.HttpClient.Request.RequestUri.AbsolutePath} with {responseComponents.ErrorStatus}");
             e.GenericResponse(responseComponents.Body ?? string.Empty, responseComponents.ErrorStatus, responseComponents.Headers);

msgraph-chaos-proxy/ChaosProxyConfiguration.cs

@@ -93,7 +93,7 @@ public void Dispose()
 
     public class ChaosProxyMockResponse {
         [JsonPropertyName("url")]
-        public string Url { get; set; }
+        public string Url { get; set; } = string.Empty;
         [JsonPropertyName("responseCode")]
         public int? ResponseCode { get; set; } = 200;
         [JsonPropertyName("responseBody")]

msgraph-chaos-proxy/ErrorResponseBody.cs

@@ -4,21 +4,25 @@ namespace Microsoft.Graph.ChaosProxy {
     internal class ErrorResponseBody {
         [JsonPropertyName("error")]
         public ErrorResponseError Error { get; set; }
+
+        public ErrorResponseBody(ErrorResponseError error) {
+            Error = error;
+        }
     }
 
     internal class ErrorResponseError {
         [JsonPropertyName("code")]
-        public string Code { get; set; }
+        public string Code { get; set; } = string.Empty;
         [JsonPropertyName("message")]
-        public string Message { get; set; }
+        public string Message { get; set; } = string.Empty;
         [JsonPropertyName("innerError")]
-        public ErrorResponseInnerError InnerError { get; set; }
+        public ErrorResponseInnerError? InnerError { get; set; }
     }
 
     internal class ErrorResponseInnerError {
         [JsonPropertyName("request-id")]
-        public string RequestId { get; set; }
+        public string RequestId { get; set; } = string.Empty;
         [JsonPropertyName("date")]
-        public string Date { get; set; }
+        public string Date { get; set; } = string.Empty;
     }
 }