Question
A fake method has been developed in order to test a method that calls a stored process. A list of integers will be returned by this procedure.
anything similar to this
public virtual ObjectResult<Nullable<int>> available_IDs( ... )
{
List<int?> fakeAvailableIDList = new List<int?>();
fakeAvailableIDList.Add(1);
fakeAvailableIDList.Add(2);
fakeAvailableIDList.Add(3);
ObjectResult<Nullable<int>> result = fakeAvailableIDList.All(m => m > 0);
return result;
}
it falters with
Cannot implicitly convert type 'bool' to 'System.Data.Objects.ObjectResult<int?>'
tried (amoungst other things)
ObjectResult<Nullable<int>> result = fakeAvailableIDList.All(m => m > 0);
which results
Cannot implicitly convert type 'System.Collections.Generic.List<int?>' to 'System.Data.Objects.ObjectResult<int?>'
How can I enter a List into an ObjectResult?
Accepted Answer
The arrow
fakeAvailableIDList.All(m => m > 0);
gives a boolean result because.All
returns True
or False
based on whether or not each member in the collection satisfies the requirement.
Therefore, a variable of typeObjectResult
cannot be set to a type variableBool
.
The ObjectResult
and ObjectResult<T>
Because types have secret constructors, you cannot arbitrary build instances of them. Further, theObjectResult<T>
type cannot be expanded since it is sealed. Therefore, if you're seeking for a simple method to construct anObjectResult
through anEnumerable
.
I believe that changing the type that the function you're attempting to test uses would be the simplest course of action. As a result, if the method's signature:
void Foo(ObjectResult<int?> result);
Replace it with:
void Foo(IEnumerable<int?> result);
This will enable you to test the method using a fictitious collection and yet be able to pass it an evaluation.ObjectContext<int?>
just becauseObjectContext<int?>
extends IEnumerable<int?>
.
Popular Answer
I'm aware that issue has previously been addressed, however I have come up with a workaround that involves mocking the relevant Linq extension.ObjectResult<T>
.
For instance:
Mock.Get(PortalEntitiesMock).Setup(m => m.ExecuteSqlQuery(It.Is<String>(x => x.ToUpper().StartsWith("SELECT"))).FirstOrDefault()).Returns<string>(p=>p).Verifiable();
Consequently, you may mimic certain elements on an ObjectResult<T>
if not the real itemObjectResult<T>
.
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