[英]Mocking a Method that uses an Optional Parameter using Moq
我有一個消息框服務,其中包含以下界面
public interface IMessageBoxService
{
DialogResult DisplayMessage(IWin32Window owner, string text,
string caption, MessageBoxButtons buttons, MessageBoxIcon icon,
MessageBoxDefaultButton defaultButton = MessageBoxDefaultButton.Button1);
}
它只是包裝了System.Windows.Forms
消息框,並允許我模擬顯示消息框的部分代碼。 現在,我有一個文本文檔的搜索服務,如果搜索循環,則顯示“不再有位於”的消息。 我想為這個類的功能編寫單元測試, FindNextMethod
是
public TextRange FindNext(IDocumentManager documentManager, IMessageBoxService messageBoxService,
TextEditorControl textEditor, SearchOptions options, FindAllResultSet findAllResults = null)
{
...
if (options.SearchType == SearchType.CurrentDocument)
{
Helpers.SelectResult(textEditor, range);
if (persistLastSearchLooped)
{
string message = MessageStrings.TextEditor_NoMoreOccurrances;
messageBoxService.DisplayMessage(textEditor.Parent, message,
Constants.Trademark, MessageBoxButtons.OK, MessageBoxIcon.Information); <- Throws here.
Log.Trace($"TextEditorSearchProvider.FindNext(): {message}");
lastSearchLooped = false;
}
}
...
}
我的考試是
[TestMethod]
public void FindInCurrentForwards()
{
// Mock the IMessageBoxService.
int dialogShownCounter = 0;
var mock = new Mock<IMessageBoxService>();
mock.Setup(m => m.DisplayMessage(It.IsAny<IWin32Window>(), It.IsAny<string>(), It.IsAny<string>(),
It.IsAny<MessageBoxButtons>(), It.IsAny<MessageBoxIcon>(), It.IsAny<MessageBoxDefaultButton>()))
.Returns(DialogResult.OK)
.Callback<DialogResult>(r =>
{
Trace.WriteLine($"MockMessageBoxService {r.ToString()}");
dialogShownCounter++;
});
// Start the forward search through the first document.
var options = new SearchOptions()
{
SearchText = "SomeText",
SearchType = SearchType.CurrentDocument,
MatchCase = false,
MatchWholeWord = false,
SearchForwards = false
};
var searchProvider = new TextEditorSearchProvider();
var textEditor = ((TextEditorView)documentManager.GetActiveDocument().View).TextEditor;
TextRange range = null;
for (int i = 0; i < occurances + 1; ++i)
range = searchProvider.FindNext(documentManager, mock.Object, textEditor, options);
// We expect the text to be found and the dialog to be displayed once.
Assert.IsNotNull(range);
Assert.AreEqual(1, dialogShownCounter);
}
但是我得到了一個
System.Reflection.TargetParameterCountException參數計數不匹配。
我已經看到了這個問題 ,我似乎正在做的答案建議並提供可選參數,但我仍然得到例外,為什么?
我在這里看到一個答案,建議我必須使用.Result
和正確的參數計數,所以我試過了
mock.Setup(m => m.DisplayMessage(It.IsAny<IWin32Window>(), It.IsAny<string>(), It.IsAny<string>(),
It.IsAny<MessageBoxButtons>(), It.IsAny<MessageBoxIcon>(), It.IsAny<MessageBoxDefaultButton>()))
.Returns((IWin32Window owner, string text, string caption, MessageBoxButtons buttons, MessageBoxIcon icon,
MessageBoxDefaultButton defaultButton) => DialogResult.OK)
.Callback<DialogResult>(r =>
{
Trace.WriteLine($"MockMessageBoxService {r.ToString()}");
dialogShownCounter++;
});
謝謝你的時間。
拋出TargetParameterCountException,因為您的回調注冊僅使用一個參數注冊。
.Callback<DialogResult>(r =>
{
Trace.WriteLine($"MockMessageBoxService {r.ToString()}");
dialogShownCounter++;
});
Callback不能接受Returns返回的值。 它仍然必須匹配模擬的方法簽名。
.Callback((IWin32Window a1, string a2,
string a3, MessageBoxButtons a4, MessageBoxIcon a5,
MessageBoxDefaultButton a6) => { dialogShownCounter++ });
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