C# – How to Mock Request object in unit testing asp.net mvc application

asp.net-mvccmoqrequestunit testing

I am working on an asp.net mvc 3.0 application. In unit testing one of the action method in my controller, I was getting an error.

How to mock: Request.Params["FieldName"]

I have included Moq framework, but was not sure how to pass value

Here is my code… Please suggest…

 var request = new Mock<System.Web.HttpRequestBase>();

 request
     .SetupGet(x => x.Headers)
     .Returns(
         new System.Net.WebHeaderCollection
         {
             {"X-Requested-With", "XMLHttpRequest"}
         });

 var context = new Mock<System.Web.HttpContextBase>();

 context.SetupGet(x => x.Request).Returns(request.Object);

 ValidCodeController target = new ValidCodeController();

 target.ControllerContext =
     new ControllerContext(context.Object, new RouteData(), target);

Best Answer

Params is a NameValueCollection property that can be set-up in a similar way to Headers:

var requestParams = new NameValueCollection
{
    { "FieldName", "value"}
};

request.SetupGet(x => x.Params).Returns(requestParams);

Related Solutions

Asp.net-mvc – How to mock the Request on Controller in ASP.Net MVC

Using Moq:

var request = new Mock<HttpRequestBase>();
// Not working - IsAjaxRequest() is static extension method and cannot be mocked
// request.Setup(x => x.IsAjaxRequest()).Returns(true /* or false */);
// use this
request.SetupGet(x => x.Headers).Returns(
    new System.Net.WebHeaderCollection {
        {"X-Requested-With", "XMLHttpRequest"}
    });

var context = new Mock<HttpContextBase>();
context.SetupGet(x => x.Request).Returns(request.Object);

var controller = new YourController();
controller.ControllerContext = new ControllerContext(context.Object, new RouteData(), controller);

UPDATED:

Mock Request.Headers["X-Requested-With"] or Request["X-Requested-With"] instead of Request.IsAjaxRequest().

Java – How to mock void methods with Mockito

Take a look at the Mockito API docs. As the linked document mentions (Point # 12) you can use any of the doThrow(),doAnswer(),doNothing(),doReturn() family of methods from Mockito framework to mock void methods.

For example,

Mockito.doThrow(new Exception()).when(instance).methodName();

or if you want to combine it with follow-up behavior,

Mockito.doThrow(new Exception()).doNothing().when(instance).methodName();

Presuming that you are looking at mocking the setter setState(String s) in the class World below is the code uses doAnswer method to mock the setState.

World mockWorld = mock(World.class); 
doAnswer(new Answer<Void>() {
    public Void answer(InvocationOnMock invocation) {
      Object[] args = invocation.getArguments();
      System.out.println("called with arguments: " + Arrays.toString(args));
      return null;
    }
}).when(mockWorld).setState(anyString());

Best Answer

Related Solutions

Asp.net-mvc – How to mock the Request on Controller in ASP.Net MVC

Java – How to mock void methods with Mockito

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