public void AddScooter_ScooterExists_ThrowsException()
{
_scooterRepositoryMock.Setup(x => x.GetById(It.IsAny <string>())).Returns(new Scooter("id", 1));
_scooterService.Invoking(x => x.AddScooter("id", 1)).Should().Throw <DuplicateScooterException>();
}