add wait logic for real life sns-sqs test

Author: Blind-Striker

tests/LocalStack.Client.Functional.Tests/Scenarios/RealLife/SnsToSqsScenario.cs

@@ -1,4 +1,6 @@
-using MessageAttributeValue = Amazon.SimpleNotificationService.Model.MessageAttributeValue;
+using System.Threading;
+
+using MessageAttributeValue = Amazon.SimpleNotificationService.Model.MessageAttributeValue;
 
 namespace LocalStack.Client.Functional.Tests.Scenarios.RealLife;
 
@@ -64,6 +66,14 @@ public virtual async Task Should_Create_A_SNS_Topic_And_SQS_Queue_Then_Subscribe
 
         Assert.Equal(HttpStatusCode.OK, receiveMessageResponse.HttpStatusCode);
 
+        if (receiveMessageResponse.Messages.Count == 0)
+        {
+            await Task.Delay(2000);
+            receiveMessageResponse = await AmazonSqs.ReceiveMessageAsync(receiveMessageRequest);
+
+            Assert.Equal(HttpStatusCode.OK, receiveMessageResponse.HttpStatusCode);
+        }
+
         Assert.NotNull(receiveMessageResponse.Messages);
         Assert.NotEmpty(receiveMessageResponse.Messages);
         Assert.Single(receiveMessageResponse.Messages);