public void Delete()
{
// Arrange
CarAdvertController controller = new CarAdvertController();
controller.DummyAdvertList = TestAdvertList.ToList();
// Act
CarAdvertViewModel oldAdvertOne = controller.GetAdvertById(1);
CarAdvertViewModel oldAdvertTwo = controller.GetAdvertById(2);
controller.DeleteAdvert(1);
IEnumerable <CarAdvertViewModel> result = controller.GetAll();
// Assert
Assert.AreEqual(5, result.Count());
Assert.AreNotEqual(oldAdvertOne, result.ElementAt(0));
Assert.AreEqual(oldAdvertTwo, result.ElementAt(0));
}