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c#unit-testingdynamicmockingmoq
Ramesh Rajendran
Ramesh Rajendran

Reputation: 38663

Lambda query does not working with Moq data for `Task<IEnumerable<dynamic>>` return type method

This query does not working while giving dummy data via Moq Setup. 

colorsList.Select(cl => (string)cl.MainTypeCode).Where(mt => mt != null).Distinct().ToList()

Passing data by Using Moq:

 mockColorsRepository.Setup(rep => rep.GetColorsList()).Returns(Task.FromResult<IEnumerable<dynamic>>
                (new[] { new { DoorCode = "001", MainTypeCode = "1" }, new { DoorCode = "002", MainTypeCode = "2" } }));

Where GetColorsList() has an async method and dynamic return type 

Task<IEnumerable<dynamic>> GetColorsList();

enter image description here

Passing data by hardcoding:

But it is working while I am hardcoding same way of data without using Moq, like 

 var colorsList = Task.FromResult<IEnumerable<dynamic>>(new[] { new { DoorCode = "001", MainTypeCode = "1" },
                    new { DoorCode = "002", MainTypeCode = "2" } }).Result;

enter image description here

The problem is: you can see the data in both way while of debugging, But the Lambda query does not working while passing Mock data via Moq Setup.

Note Does not working means it's throwing an Object does not contains a definition for maintypecode error.

enter image description here

Upvotes: 1

Views: 464

Answers (2)

Ramesh Rajendran
Ramesh Rajendran

Reputation: 38663

Thanks @DaveParsons to gave me a key idea.

I think anonymous types are internal by default hence you aren't able to access the properties from another library, namely your test project

I got it from this discussion : Return/consume dynamic anonymous type across assembly boundaries

So I am go to useExpandoObject for mocking data 

  public static IEnumerable<dynamic> GetValues()
        {
            List<ExpandoObject> expando = new List<ExpandoObject>();

            dynamic expandoObject = new ExpandoObject();
            expandoObject.DoorCode = "123";
            expandoObject.MainTypeCode = "123";
            expando.Add(expandoObject);

            dynamic expandoObject1 = new ExpandoObject();
            expandoObject1.DoorCode = "321";
            expandoObject1.MainTypeCode = "321";
            expando.Add(expandoObject1);

            return expando;
        }

I am passing that mock data to the return method of Moq setup like 

 mockColorsRepository.Setup(rep => rep.GetColorsList()).Returns(Task.FromResult(GetValues()));

Everything is working now.

Upvotes: 1

user61470
user61470

Reputation:

Your mock is returning an IEnumerable<f__AnonymousType0<string,string>> which is generated by the compiler as an internal class and so you don't have access to the properties from your test library.

Ideally you would be able to rewrite so as to replace your use of dynamic with a class that you define and have control over (and can therefore access appropriately).

Another option would be to use reflection to get the values from the object something along the lines of cl.GetType().GetProperty("MainTypeCode").GetValue(cl) this is, in my opinion, a bit of a hacky solution but it's an option nonetheless.

Upvotes: 2

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