Question

我的目标是能够对一些自定义HtmlHelper扩展进行单元测试 - 这些扩展在内部使用RenderPartial。

http://ox.no/posts/mocking-htmlhelper-in-asp-net-mvc-2-and-3-using-moq

我尝试使用上面的方法来模拟HtmlHelper。但是，我遇到了Null值异常。 “参数名称：视图”

任何人都有任何想法？感谢。

以下是代码的想法：

    [TestMethod]
    public void TestMethod1()
    {
        var helper = CreateHtmlHelper(new ViewDataDictionary());
        helper.RenderPartial("Test");  // supposingly this line is within a method to be tested
        Assert.AreEqual("test", helper.ViewContext.Writer.ToString());
    }


    public static HtmlHelper CreateHtmlHelper(ViewDataDictionary vd)
    {
        Mock<ViewContext> mockViewContext = new Mock<ViewContext>(
            new ControllerContext(
                new Mock<HttpContextBase>().Object,
                new RouteData(),
                new Mock<ControllerBase>().Object),
            new Mock<IView>().Object,
            vd,
            new TempDataDictionary(),
            new StringWriter());
        var mockViewDataContainer = new Mock<IViewDataContainer>();
        mockViewDataContainer.Setup(v => v.ViewData)
            .Returns(vd);
        return new HtmlHelper(mockViewContext.Object,
                                mockViewDataContainer.Object);
    }

Answer 1

检查一下......这是一篇很棒的文章http://blogs.teamb.com/craigstuntz/2010/09/10/38638/

Answer 2

我遇到了同样的问题。当我将参数传递给新的Mock（）时，它没有正确设置它们。您需要明确地设置它们：

mockViewContext.Setup(v => v.View).Returns(new Mock<IView>().Object);
mockViewContext.Setup(v => v.ViewData).Returns(viewData);
mockViewContext.Setup(v => v.TempData).Returns(new TempDataDictionary());
mockViewContext.Setup(v => v.Writer).Returns(writer);

.net mvc2自定义HtmlHelper扩展单元测试

2 个答案: