public void ScriptDesignerViewModel_ChooseDirectoryShould_ReturnFile()
{
var modelItem = CreateModelItem();
var viewModel = new TestJavaScriptDesignerViewModel(modelItem);
Assert.IsTrue(string.IsNullOrEmpty(viewModel.IncludeFile));
viewModel.IncludeFile = GetJsTmpFile();
viewModel.Validate();
var command = new DelegateCommand(o => viewModel.ChooseScriptSources());
Assert.IsTrue(viewModel.ChooseScriptSourceCommand.CanExecute(command));
viewModel.ChooseScriptSourceCommand.Execute(command);
Assert.IsFalse(string.IsNullOrEmpty(viewModel.IncludeFile));
}