Update BasicIntelliSense tests for async completion behavior changes

src/VisualStudio/IntegrationTest/IntegrationTests/VisualBasic/BasicIntelliSense.cs

@@ -97,6 +97,20 @@ End Sub
 End Module",
 assertCaretPosition: true);
 
+            if (LegacyCompletionCondition.Instance.ShouldSkip)
+            {
+                // Async completion has an extra undo step
+                VisualStudio.SendKeys.Send(Ctrl(VirtualKey.Z));
+
+                VisualStudio.Editor.Verify.TextContains(@"
+Module Module1
+    Sub Main()
+        Dim q As List($$)
+    End Sub
+End Module",
+assertCaretPosition: true);
+            }
+
             VisualStudio.SendKeys.Send(Ctrl(VirtualKey.Z));
 
             VisualStudio.Editor.Verify.TextContains(@"