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POHow to Unit Test a custom ModelBinder using Moq?
 

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  1. POHow to Unit Test a custom ModelBinder using Moq?
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    <p>I'm having some difficulty writing some Unit Tests to test a custom ModelBinder that I created. The ModelBinder I'm trying to Unit Test is the JsonDictionaryModelBinder that I posted <a href="https://stackoverflow.com/questions/1077481/how-do-i-pass-a-dictionary-as-a-parameter-to-an-actionresult-method-from-jquery-a/1080721#1080721">here</a>.</p> <p>The problem I'm having is getting the Mocking all setup using Moq. I keep getting Null Exceptions due to the HttpContextBase not being Mocked correctly. I think.</p> <p>Could someone help me figure out what I'm not doing correclty?</p> <p>Here's a sample of the Unit Test I'm trying to write that doesn't work:</p> <pre><code>[TestMethod()] public void BindModelTest() { JsonDictionaryModelBinder target = new JsonDictionaryModelBinder(); NameValueCollection nameValueCollection = new NameValueCollection() { {"First", "1"}, {"Second", "2"}, {"Name", "Chris"}, {"jsonValues", "{id: 200, name: 'Chris'}"} }; HttpContextBase httpContext = MockHelper.FakeHttpContext(HttpVerbs.Post, nameValueCollection); ControllerContext controllerContext = new ControllerContext(new RequestContext(httpContext, new RouteData()), new Mock&lt;Controller&gt;().Object); Predicate&lt;string&gt; predicate = propertyName =&gt; (propertyName == "jsonValues"); ModelBindingContext bindingContext = new ModelBindingContext() { Model = null, ModelType = typeof(JsonDictionary), ModelState = new ModelStateDictionary(), PropertyFilter = predicate, ValueProvider = new Dictionary&lt;string, ValueProviderResult&gt;() { { "foo", null } } }; //object expected = null; // TODO: Initialize to an appropriate value var actual = target.BindModel(controllerContext, bindingContext) as JsonDictionary; Assert.IsNotNull(actual); Assert.AreEqual("Chris", actual["name"]); //Assert.AreEqual(expected, actual); Assert.Inconclusive("Verify the correctness of this test method."); } </code></pre> <p>Here's the "FakeHttpContext" method used above:</p> <pre><code>public static class MockHelper { public static HttpContextBase FakeHttpContext(HttpVerbs verbs, NameValueCollection nameValueCollection) { var httpContext = new Mock&lt;HttpContextBase&gt;(); var request = new Mock&lt;HttpRequestBase&gt;(); request.Setup(c =&gt; c.Form).Returns(nameValueCollection); request.Setup(c =&gt; c.QueryString).Returns(nameValueCollection); var response = new Mock&lt;HttpResponseBase&gt;(); var session = new Mock&lt;HttpSessionStateBase&gt;(); var server = new Mock&lt;HttpServerUtilityBase&gt;(); httpContext.Setup(c =&gt; c.Request).Returns(request.Object); var u = verbs.ToString().ToUpper(); httpContext.Setup(c =&gt; c.Request.RequestType).Returns( verbs.ToString().ToUpper() ); httpContext.Setup(c =&gt; c.Response).Returns(response.Object); httpContext.Setup(c =&gt; c.Server).Returns(server.Object); httpContext.Setup(c =&gt; c.User.Identity.Name).Returns("testclient"); return httpContext.Object; } } </code></pre>
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    1. USChris Pietschmann
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