Add delay to ensure test works properly

Author: shana

test/UnitTests/GitHub.App/ViewModels/Dialog/RepositoryCloneViewModelTests.cs

@@ -111,6 +111,10 @@ public async Task StartsTrueBecomesFalseWhenCompleted()
 
             await col.OriginalCompleted;
 
+            // we need to wait slightly because the subscription OnComplete in the model
+            // runs right after the above await finishes, which means the assert
+            // gets checked before the flag is set
+            await Task.Delay(100);
             Assert.False(vm.IsBusy);
         }