Dev2.CustomControls.Progress.ProgressFileDownloader.Download C# (CSharp) Method

        public void Download(Uri address, string tmpFileName, bool dontStartUpdate, string fileName, string checkSum)
        {

 
            _tmpFileName = tmpFileName;
            if(_file.Exists(_tmpFileName))
            {
                _file.Delete(_tmpFileName);
            }

            _dontStartUpdate = dontStartUpdate;
            _webClient.DownloadFileAsync(address, tmpFileName, tmpFileName);
            _webClient.DownloadFileCompleted += (o, args) =>
                {

                    if(!args.Cancelled && null == args.Error && PerformCheckSum(tmpFileName, checkSum))
                    {

                        _file.Move(tmpFileName, fileName);
                        OnDownloadFileCompleted(args, fileName);
                    }
                    else
                    {
                        _file.Delete(tmpFileName);
                        ProgressDialog.Close();

                    }



                };

            ProgressDialog.Show();
            IsBusyDownloading = true;
        }

// ReSharper disable InconsistentNaming
        public void ProgressFileDownloader_UnitTest_Download_AsyncDownloadStartedAndProgressDialogShown()
// ReSharper restore InconsistentNaming
        {
            //init
            var mockWebClient = new Mock<IDev2WebClient>();
            mockWebClient.Setup(c => c.DownloadFileAsync(It.IsAny<Uri>(), It.IsAny<string>(), It.IsAny<string>())).Verifiable();
            var mockProgressDialog = new Mock<IProgressDialog>();
            mockProgressDialog.Setup(c => c.Show()).Verifiable();
            ProgressFileDownloader.GetProgressDialogViewModel = (x, y) => mockProgressDialog.Object;
            var testProgressFileDownloader = new ProgressFileDownloader(mockWebClient.Object, new Mock<IFile>().Object,new Mock<ICryptoProvider>().Object);
            //exe
            testProgressFileDownloader.Download(It.IsAny<Uri>(), It.IsAny<string>(), false,It.IsAny<string>(), "");

            //assert
            mockWebClient.Verify(c => c.DownloadFileAsync(It.IsAny<Uri>(), It.IsAny<string>(), It.IsAny<string>()));

        }