I have a message box service that hase the following interface
public interface IMessageBoxService
{
DialogResult DisplayMessage(IWin32Window owner, string text,
string caption, MessageBoxButtons buttons, MessageBoxIcon icon,
MessageBoxDefaultButton defaultButton = MessageBoxDefaultButton.Button1);
}
It essentally wraps the System.Windows.Forms
message box and allows me to Mock parts of my code that show a message box. Now I have a search service for text documents that shows a "No more occurrances located" message if the search looped. I want to write a unit test for the functionality of this class, the FindNextMethod
is
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($"TextEditorSearchProvider.FindNext(): {message}");
lastSearchLooped = false;
}
}
...
}
My test is
[TestMethod]
public void FindInCurrentForwards()
{
// Mock the IMessageBoxService.
int dialogShownCounter = 0;
var mock = new Mock<IMessageBoxService>();
mock.Setup(m => m.DisplayMessage(It.IsAny<IWin32Window>(), It.IsAny<string>(), It.IsAny<string>(),
It.IsAny<MessageBoxButtons>(), It.IsAny<MessageBoxIcon>(), It.IsAny<MessageBoxDefaultButton>()))
.Returns(DialogResult.OK)
.Callback<DialogResult>(r =>
{
Trace.WriteLine($"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);
}
However I am getting an
System.Reflection.TargetParameterCountException Parameter count mismatch.
I have seen this question and I seem to be doing as the answer suggest and supplying the optional parameter but I still get the exception, why?
I have seen an answer here suggesting I have to use .Result
with the correct parameter count, so I tried
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++;
});
Thanks for your time.