Add project files.

test/integration/Elsa.Resilience.IntegrationTests/SequentialStatusHandler.cs

@@ -0,0 +1,19 @@
+using System.Net;
+using System.Net.Http.Headers;
+
+namespace Elsa.Resilience.IntegrationTests;
+
+public class SequentialStatusHandler(IEnumerable<HttpStatusCode> codes) : HttpMessageHandler
+{
+    private readonly Queue<HttpStatusCode> _codes = new(codes);
+    protected override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
+    {
+        var code = _codes.Count > 0 ? _codes.Dequeue() : _codes.Last();
+        var response = new HttpResponseMessage(code)
+        {
+            Content = new StringContent(string.Empty)
+        };
+        response.Content.Headers.ContentType = new MediaTypeHeaderValue("text/plain");
+        return Task.FromResult(response);
+    }
+}