public void TestPhoneDisplay()
        {
            var mock = new Mock <IMobileRepository>();

            mock.Setup(m => m.GetPhoneFromDatabase()).Returns(GetTestPhoneRepository());

            var mobileService = new MobileService(mock.Object);

            var expectedResult = GetTestPhoneExpected().Display;

            var result = mobileService.GetPhone().Display;

            Assert.Equal(expectedResult, result);
        }