I have code similar to this in a method that I'm trying to unit test:

return _context.usp_get_Some_Data(someStringParam).FirstOrDefault();

The stored proc call return type:

ObjectResult<usp_get_Some_Data_Result>. 

In my unit test, I'm trying to do something like this (using NUnit and Moq):

var procResult = new ObjectResult<usp_get_Some_Data_Result>();
mockContext.Setup(m => m.usp_get_Some_Data(It.IsAny<string>()))
    .Returns(procResult);

However, I'm not able to create an instance of ObjectResult (this is System.Data.Entity.Core.Objects.ObjectResult<T>, not the older System.Data.Objects one). It doesn't have a public parameterless constructor, but the documentation says it has a protected one. From my testing, he documentation appears to be incorrect.

What I've Tried: I've tried creating a derived class and calling base() on the constructor, and I've also tried using reflection (both Activator.CreateInstance and invoking the ConstructorInfo with BindingFlags of NonPublic, all of which have failed (it appears from my debugging this that the type does have three private constructors, all of which have 3 or more parameters, but unfortunately it looks like a major effort to figure out what is actually required for these parameters).

I've also tried creating an IEnumberable<usp_get_Some_Data_Result> and casting it to ObjectResult<usp_get_Some_Data_Result> but the cast fails. In addition, I've tried something like

var mockObjectResult = new Mock<ObjectResult<usp_get_Some_Data_Result>>();

Pretty much everything I've tried fails with a similar error about a default constructor not being available.

Question: Is there any way to create an instance of ObjectResult<T> for unit testing, or is there any other type that I can create that can be successfully cast to ObjectResult<T>?