public void OnUploadCanceled()
{
// arrange
var vm = new FieldFileViewModel();
var fileProcess = Mock.Create<IFileProcess>(Behavior.Loose);
fileProcess.IsUploading = true;
Mock.NonPublic.Arrange<IFileProcess>(vm, "CurrentFileProcess").Returns(fileProcess);
var privateAccessor = new PrivateAccessor(vm);
privateAccessor.SetField("_stopExecuteUploadCanceledEvent", true);
// act
vm.OnUploadCanceled(null, null);
// assert
Assert.IsTrue(fileProcess.IsUploading);
// arrange
privateAccessor.SetField("_stopExecuteUploadCanceledEvent", false);
var beginCancelUploadingCalled = false;
Mock.Arrange(() => fileProcess.BeginCancelUploading(Arg.IsAny<Action<object, IDataPortalResult>>()))
.DoInstead(() => beginCancelUploadingCalled = true);
// act
vm.OnUploadCanceled(null, null);
// assert
Assert.IsFalse(fileProcess.IsUploading);
Assert.IsTrue(beginCancelUploadingCalled);
Assert.AreEqual(FileControlMode.Upload, vm.CurrentState);
}