public void TestSaveNull()
 {
     IAreaService areaService = new AreaService(null);
     Assert.Throws<ArgumentNullException>(() => areaService.Save(null));
 }
        public void TestSave()
        {
            Mock<IAreaDao> areaDaoMock = new Mock<IAreaDao>();
            areaDaoMock.Setup(x => x.Save(It.IsAny<Area>()));

            Area area = new Area();

            IAreaService areaService = new AreaService(areaDaoMock.Object);
            areaService.Save(area);

            areaDaoMock.Verify(x=>x.Save(area), Times.Once);
        }