Integration Tests don't work

[Irame]

Even with the latest version of VsixTesting and XUnit the integration tests throw the following exception:

  Message: 
System.Exception : System.InvalidOperationException: Visual Studio is in the process of performing an upgrade. Unable to install extension during upgrade.
   at Microsoft.VisualStudio.ExtensionManager.SetupEngineService.CreateEngine(IEngineHost engineHost, IServiceProvider serviceProvider, InstallFlags installFlags)
   at Microsoft.VisualStudio.ExtensionManager.InstallModule.PerformSetupEngineInstall(InstallableExtensionImpl extensionToInstall, Boolean installPerMachine, Boolean isPackComponent, IDictionary`2 extensionsInstalledSoFar, List`1 extensionsUninstalledSoFar, IInstalledExtensionList modifiedInstalledExtensionsList, IProgress`1 progress, InstallFlags installFlags, AsyncOperation asyncOp, Version targetedVsVersion, IInstalledExtension& newExtension)
   at Microsoft.VisualStudio.ExtensionManager.InstallModule.InstallInternal(InstallableExtensionImpl extension, InstallFlags installFlags, IDictionary`2 extensionsInstalledSoFar, List`1 extensionsUninstalledSoFar, IInstalledExtensionList modifiedInstalledExtensionsList, AsyncOperation asyncOp, IProgress`1 progress, Version targetedVsVersion)
   at Microsoft.VisualStudio.ExtensionManager.InstallModule.BeginInstall(IInstallableExtension installableExtension, InstallFlags installFlags, AsyncOperation asyncOp, Version targetedVsVersion)
   at Microsoft.VisualStudio.ExtensionManager.ExtensionEngineImpl.Install(IInstallableExtension extension, InstallFlags installFlags, Version targetedVsVersion)
   at Microsoft.VisualStudio.ExtensionManager.ExtensionManagerService.Install(IInstallableExtension extension, Boolean perMachine)
   at VsixTesting.Installer.Installer.Install(String extensionPath, Nullable`1 allUsers)
   at System.Linq.Enumerable.Count[TSource](IEnumerable`1 source, Func`2 predicate)
   at VsixTesting.Installer.Installer.Install(String applicationPath, String rootSuffix, IEnumerable`1 extensionPaths, Nullable`1 allUsers)
   at VsixTesting.Installer.Program.Run(String applicationPath, String rootSuffix, Version vsProductVersion, String[] args)

  Stack Trace: 
<RunInstallerAsync>d__18.MoveNext() line 51
--- End of stack trace from previous location where exception was thrown ---
ExceptionDispatchInfo.Throw()
TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
<InstallExtensionsAsync>d__16.MoveNext() line 18
--- End of stack trace from previous location where exception was thrown ---
ExceptionDispatchInfo.Throw()
TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
<<Prepare>b__0>d.MoveNext() line 53
--- End of stack trace from previous location where exception was thrown ---
ExceptionDispatchInfo.Throw()
TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
<<RunAsync>b__0>d.MoveNext() line 34
--- End of stack trace from previous location where exception was thrown ---
ExceptionDispatchInfo.Throw()
TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
<<RunAsync>b__0>d.MoveNext() line 182
--- End of stack trace from previous location where exception was thrown ---
ExceptionDispatchInfo.Throw()
TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
--- End of stack trace from previous location where exception was thrown ---
ExceptionDispatchInfo.Throw()
TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
<RunAsync>d__5.MoveNext() line 185
--- End of stack trace from previous location where exception was thrown ---
ExceptionDispatchInfo.Throw()
TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
<Prepare>d__15.MoveNext() line 41
--- End of stack trace from previous location where exception was thrown ---
ExceptionDispatchInfo.Throw()
TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
<Init>d__41.MoveNext() line 111
--- End of stack trace from previous location where exception was thrown ---
ExceptionDispatchInfo.Throw()
TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
<RunAsync>d__40.MoveNext() line 80
--- End of stack trace from previous location where exception was thrown ---
ExceptionDispatchInfo.Throw()
<RunAsync>d__40.MoveNext() line 88
--- End of stack trace from previous location where exception was thrown ---
ExceptionDispatchInfo.Throw()
TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
<<Remote_RunTestCasesAsync>b__2>d.MoveNext() line 64