RestSharp Unit Test NUnit Moq RestResponse null reference exception

Question

I'm having some challenges trying to use Moq with RestSharp. Maybe it's it my misunderstanding of Moq but for some reason I keep on getting a null reference exception when trying to Mock a RestResponse.

Here is my unit test.

    [Test]
    public void GetAll_Method_Throws_exception_if_response_Data_is_Null()
    {
        var restClient = new Mock<IRestClient>();

        restClient.Setup(x => x.Execute(It.IsAny<IRestRequest>()))
            .Returns(new RestResponse<RootObjectList>
            {
                StatusCode = HttpStatusCode.OK,
                Content = null
            } );

        var client = new IncidentRestClient(restClient.Object);

        Assert.Throws<Exception>(() => client.GetAll());
    }

Here is my actually implementation:

public class IncidentRestClient : IIncidentRestClient
{
    private readonly IRestClient client;
    private readonly string url = "some url here";

    public IncidentRestClient()
    {
        client = new RestClient { BaseUrl = new Uri(url) };
    }

    public RootObjectList  GetAll()
    {
        var request = new RestRequest("api/now/table/incident", Method.GET) { RequestFormat = DataFormat.Json };
        request.OnBeforeDeserialization = resp => { resp.ContentType = "application/json"; };

        IRestResponse<RootObjectList> response = client.Execute<RootObjectList>(request);

        if (response.Data == null)
            throw new Exception(response.ErrorException.ToString());

        return response.Data;
    }
}

For some reason response object is null. Could it be I'm mocking the return object incorrectly?

Answer 1

For disclosure purposes, I am assuming that your IncidentRestClient has a constructor that takes an IRestClient instance as a parameter and uses it to set the client member.

It looks like, in your test, you are running Setup for a different overload of Execute than the one you are using. Instead of:

.Setup(x => x.Execute(

try:

.Setup(x => x.Execute<RootObjectList>(