.net mvc2 custom HtmlHelper extension unit testing
- by alex
My goal is to be able to unit test some custom HtmlHelper extensions - which use RenderPartial internally.
http://ox.no/posts/mocking-htmlhelper-in-asp-net-mvc-2-and-3-using-moq
I've tried using the method above to mock the HtmlHelper. However, I'm running into Null value exceptions.
"Parameter name: view"
Anyone have any idea?? Thanks.
Below are the ideas of the code:
[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);
}
