public async Task Fail_CostHasBeenRecalled_Empty_CostId()
        {
            //Arrange
            var costId      = Guid.Empty;
            var costOwnerId = _costOwnerId;

            //Act
            bool result = await _emailNotificationService.CostHasBeenRecalled(costId, costOwnerId);

            //Assert
            result.Should().BeFalse();
            _paperPusherClientMock.Verify(p => p.SendMessage(It.IsAny <EmailNotificationMessage <CostNotificationObject> >()), Times.Never);
        }