public void ServiceCallDisposed()
{
_serviceCall.Dispose();
Assert.ThrowsException <ObjectDisposedException>(() => _serviceCall.SetResult(""));
Assert.ThrowsException <ObjectDisposedException>(() => _serviceCall.SetException(new AppCenterException("")));
Assert.ThrowsException <ObjectDisposedException>(() => _serviceCall.ContinueWith(_ => {}));
Assert.ThrowsException <ObjectDisposedException>(() => _serviceCall.CopyState(new ServiceCall()));
Assert.ThrowsException <ObjectDisposedException>(() => _serviceCall.Cancel());
}