Received() returns error of non-matching call with the same values.

[Nathan Middleton]

I am attempting to verify that this methid is called.

foo.Error(1, null,"", new Exception("Could not find test data"));

I make the method call and through debugger can see the call succeed but when I run the recieved call.

fakefoo.Received().Error(Arg.Is(1), Arg.Is<object>(null), Arg.Is<string>(""), Arg.Is<Exception>(new Exception("Could not find test data")));

The test fails with the following exception.

NSubstitute.Exceptions.ReceivedCallsException: Expected to receive a call matching:

Error(1, <null>, "", System.Exception: Could not find test data)

Actually received no matching calls.

Received 1 non-matching call (non-matching arguments indicated with '*' characters):

Error(1, <null>, "", *System.Exception: Could not find test data*)

Can anyone explain why System.Exception: Could not find test data does not match System.Exception: Could not find test data

Thanks

N8

[Alexandr Nikitin]

You created two different Exception objects, one in the call and one in the assertion. Exception class is a reference type and compared by reference. 

You can introduce a variable which gives what you want :

var exeption = new Exception("Could not find test data");

foo.Error(1, null,"", exeption);

foo.Received().Error(Arg.Is(1), Arg.Is<object>(null), Arg.Is<string>(""), Arg.Is<Exception>(exeption));