public void BeginEdit_ValidSelectedRequestForQuote_ClonedToBackupOfRequestForQuote()
 {
     // Arrange
     viewModel.backupOfRequestForQuote = null;
     viewModel.SelectedRequestForQuote = new RequestForQuoteImpl()
     {
         Identifier = 1000
     };
     // Act
     viewModel.BeginEdit();
     // Assert
     Assert.IsTrue(viewModel.backupOfRequestForQuote.Identifier == 1000, "because it is cloned by BeginEdit method");
 }