public void CanCall_BuildBuster_IfValue_IsNotNullOrEmpty()
        {
            const string currentMessage = "Breakers: Bob, Mary";

            DoConvert(currentMessage);

            // this is all we want to know - the fact that the BuildBuster "is called" (with the correct arguments)
            // (the BuildBuster is tested elsewhere - ie DRY)
            _buildBuster.ShouldHaveBeenCalled(b => b.FindBreaker(currentMessage));
        }