How to mock an NhibernateSession Query that uses a Where clause and returns a List

Question

I cannot work out how to Rhino mock the following statement:

var jobs = nhibernateSession.Query<Job>()
.Where(x => x.Trust.Id == 1)
.ToList();

I have tried various permutations, but the current unsuccessful attempt is:

nhibernateSession.Expect(y => y.Query<Job>())
.IgnoreArguments()
.Return(new List<Job> { new Job() }.AsQueryable());

The error I get back is:

Source: Anonymously Hosted DynamicMethods Assembly
Message: Object reference not set to an instance of an object.
StackTrace:    at lambda_method(Closure , Job )
at System.Linq.Enumerable.WhereListIterator`1.MoveNext()
at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)
at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)

Thanks for any advice.

Stu

Answer 1

Is it because your 'Trust' property is null on the new Job() object you are returning from your mock?

That would explain the NullReferenceException in the where clause:

.Where(x => x.Trust.Id == 1)

If this is the problem the fix is:

nhibernateSession.Expect(y => y.Query<Job>())
    .IgnoreArguments()
    .Return(new List<Job> { new Job{ Trust = new Trust() } }.AsQueryable());