public async Task Fail_CostHasBeenApproved_Empty_CostId() { //Arrange var costId = Guid.Empty; var approverUserId = _approverUserId; var approvalType = ApprovalType.Brand.ToString(); //Act bool result = await _emailNotificationService.CostHasBeenApproved(costId, approverUserId, approvalType); //Assert result.Should().BeFalse(); _paperPusherClientMock.Verify(p => p.SendMessage(It.IsAny <EmailNotificationMessage <CostNotificationObject> >()), Times.Never); }