Fixed tests.

Author: Anton Vorontsov

tests/RabbitMQ.Client.Core.DependencyInjection.Tests/Stubs/StubBaseBatchMessageHandler.cs

@@ -31,11 +31,11 @@ public StubBaseBatchMessageHandler(
 
         public override Task HandleMessages(IEnumerable<ReadOnlyMemory<byte>> messages, CancellationToken cancellationToken)
         {
-            _caller.EmptyCall();
             foreach (var message in messages)
             {
                 _caller.Call(message);
             }
+            _caller.EmptyCall();
             return Task.CompletedTask;
         }
     }

tests/RabbitMQ.Client.Core.DependencyInjection.Tests/Stubs/StubBatchMessageHandler.cs

@@ -31,11 +31,11 @@ public StubBatchMessageHandler(
 
         public override Task HandleMessages(IEnumerable<string> messages, CancellationToken cancellationToken)
         {
-            _caller.EmptyCall();
             foreach (var message in messages)
             {
                 _caller.Call(message);
             }
+            _caller.EmptyCall();
             return Task.CompletedTask;
         }
     }

tests/RabbitMQ.Client.Core.DependencyInjection.Tests/Stubs/StubCaller.cs

@@ -17,8 +17,8 @@ public StubCallerDecorator(IStubCaller caller)
 
         public void EmptyCall()
         {
-            WaitHandle.Set();
             Caller.EmptyCall();
+            WaitHandle.Set();
         }
 
         public void Call(ReadOnlyMemory<byte> message)