我有演示者、 View 和模型。 View 不知道演示者。 Presenter 协调一切并仅通过界面了解 View :
public interface ISuspiciousListManagementView
{
void ShowMessageBox(MessageBoxButtons messageBoxButtons, string message, string caption, EMessageBoxIcons icon);
void ShowDialog(IWin32Window owner);
object AllTypesDataSource { get; set; }
SuspiciousListType SelectedType { get; set; }
event EventHandler SelectedTypeChanged;
string FilePath { get; set; }
bool ShowOnlyActive { get; set; }
object AllHistoryAvailableTypesDataSource { get; set; }
SuspiciousFilteredListType SelectedHistoryType { get; set; }
event EventHandler SelectedHistoryTypeChanged;
object HistoryDataGridSource { get; set; }
event EventHandler SelectedShowOnlyActiveChanged;
ICommand BrowseFileCommand { get; set; }
ICommand UploadCommand { get; set; }
ICommand RefreshCommand { get; set; }
}
Presenter 持有方法 Init:
public async Task Init()
{
_view.AllTypesDataSource = Enum.GetValues(typeof(SuspiciousListType));
_view.AllHistoryAvailableTypesDataSource = Enum.GetValues(typeof(SuspiciousFilteredListType));
_view.SelectedTypeChanged += OnSelectedTypeChanged;
_view.SelectedHistoryTypeChanged += OnSelectedHistoryTypeChanged;
_view.SelectedShowOnlyActiveChanged += OnSelectedShowOnlyActiveChanged;
_view.HistoryDataGridSource = await GetFilterHistoryItems();
}
和字段:
private readonly ISuspiciousListManagementView _view;
这是通过构造函数注入(inject)的。
我需要验证这些代码行是否已运行:
_view.SelectedTypeChanged += OnSelectedTypeChanged;
_view.SelectedHistoryTypeChanged += OnSelectedHistoryTypeChanged;
_view.SelectedShowOnlyActiveChanged += OnSelectedShowOnlyActiveChanged;
我想运行类似的东西:
[Test]
public async void Presenter_Verify_HistoryDataGridSource_assigned_Test()
{
await _presenter.Init();
_viewMock.Verify(dp => dp.SelectedHistoryTypeChanged != null);//Compilation error
}
如何测试事件处理程序是否已添加? 我的设计有什么问题吗?
提前感谢您的帮助。
最佳答案
如果是“自动”事件,如下所示:
class Test {
public event Action MyEvent;
}
可以通过反射获取调用列表:
var eventField = test.GetType().GetField(nameof(test.MyEvent), BindingFlags.Instance | BindingFlags.NonPublic);
var eventDelegate = eventField.GetValue(test);
//either get invocation list or just compare eventDelegate with null
var invocationList = eventDelegate != null ? ((Delegate)eventDelegate).GetInvocationList() : new Delegate[0];
bool anySubscribers = invocationList.Length > 0;
这是因为编译器将 MyEvent
扩展为(非常粗略地):
class Test {
private Action MyEvent;
public event Action MyEvent
{
add { Delegate.Combine(this.MyEvent, (Delegate) value);}
remove { Delegate.Remove(this.MyEvent, value); }
}
}
我们可以获得该私有(private)(编译器生成)字段的值。
如果事件被显式实现:
class Test {
public event Action MyEvent
{
add
{
// do something
}
remove
{
// do something else
}
}
}
您不能这样做,因为可能甚至不是订阅者的概念 - add
和 remove
可以执行任意操作。但这很可能不是你的情况。
关于c# - MVP、WinForms、单元测试、起订量、NUnit : Verify that event handlers have been added to a dependency,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/42763668/