public void The_value_of_a_variable_used_as_an_out_parameter_should_not_be_used_as_a_constraint_on_an_expectation()
{
MockRepository mockRepository = new MockRepository();
ServiceBeingCalled service = mockRepository.StrictMock <ServiceBeingCalled>();
const int theNumberToReturnFromTheServiceOutParameter = 20;
using (mockRepository.Record())
{
int uninitialized;
// Uncommenting the following line will make the test pass, because the expectation constraints will match up with the actual call.
// However, the value of an out parameter cannot be used within a method value before it is set within the method value,
// so the value going in really is irrelevant, and should therefore be ignored when evaluating constraints.
// Even ReSharper will tell you "Value assigned is not used in any execution path" for the following line.
//uninitialized = 42;
// I understand I can do an IgnoreArguments() or Contraints(Is.Equal("key"), Is.Anything()), but I think the framework should take care of that for me
Expect.Call(service.PopulateOutParameter("key", out uninitialized)).Return(null).OutRef(theNumberToReturnFromTheServiceOutParameter);
}
ObjectBeingTested testObject = new ObjectBeingTested(service);
int returnedValue = testObject.MethodUnderTest();
Assert.Equal(theNumberToReturnFromTheServiceOutParameter, returnedValue);
}
public int MethodUnderTest()
{
const int A_NUMBER_THAT_SHOULD_BE_IGNORED = 42;
int thisShouldGetPopulatedByTheService = A_NUMBER_THAT_SHOULD_BE_IGNORED;
service.PopulateOutParameter("key", out thisShouldGetPopulatedByTheService);
return(thisShouldGetPopulatedByTheService);
}