Included delay before cancelling task

Author: David García Vives

test/Docker.DotNet.Tests/ISystemOperations.Tests.cs

@@ -96,9 +96,9 @@ public async Task MonitorEventsAsync_Succeeds()
 
             var progressMessage = new Progress<Message>((m) =>
             {
+                _output.WriteLine($"MonitorEventsAsync_Succeeds: Message - {m.Action} - {m.Status} {m.From} - {m.Type}");
                 wasProgressCalled = true;
                 Assert.NotNull(m);
-                _output.WriteLine($"MonitorEventsAsync_Succeeds: Message - {m.Action} - {m.Status} {m.From} - {m.Type}");
             });
 
             using var cts = CancellationTokenSource.CreateLinkedTokenSource(_cts.Token);
@@ -120,6 +120,9 @@ await _client.Images.DeleteImageAsync(
                 },
                 _cts.Token);
 
+            // Give it some time for output operation to complete before cancelling task
+            await Task.Delay(TimeSpan.FromSeconds(1));
+
             cts.Cancel();
 
             await Assert.ThrowsAsync<TaskCanceledException>(() => task).ConfigureAwait(false);