public async Task Fail_CostHasBeenCancelled_Empty_CostId() { //Arrange Guid costId = Guid.Empty; //Act bool result = await _emailNotificationService.CostHasBeenCancelled(costId); //Assert result.Should().BeFalse(); _paperPusherClientMock.Verify(p => p.SendMessage(It.IsAny <EmailNotificationMessage <CostNotificationObject> >()), Times.Never); }