How to Unit Test HtmlHelper with Moq?

Question

Could somebody show me how you would go about creating a mock HTML Helper with Moq?

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Answer 1

To test disposable helper like BeginForm with access to ViewContext.Writer you can use this:

public static HtmlHelper CreateHtmlHelper(ViewDataDictionary vd, Stream stream = null)
{
    TextWriter textWriter = new StreamWriter(stream ?? new MemoryStream());
    Mock mockViewContext = new Mock(
        new ControllerContext(
            new Mock().Object,
            new RouteData(),
            new Mock().Object
        ),
        new Mock().Object,
        vd,
        new TempDataDictionary(),
        textWriter
    );
    mockViewContext.Setup(vc => vc.Writer).Returns(textWriter);

    Mock mockDataContainer = new Mock();
    mockDataContainer.Setup(c => c.ViewData).Returns(vd);

    return new HtmlHelper(mockViewContext.Object, mockDataContainer.Object);
}