public void IServiceProviderExtensions_GetMefServiceAsync_NullArgChecks()
{
IAsyncServiceProvider nullServiceProvider = null;
Exceptions.Expect <ArgumentNullException>(() => nullServiceProvider.GetMefServiceAsync <IService>());
Exceptions.Expect <ArgumentNullException>(() => IServiceProviderExtensions.GetMefServiceAsync <IService>(nullServiceProvider));
}