Unit testing, moq, best practices

I have a setting repository that contains application settings that are stored in the database.
I currently have no unit test code coverage. The IService interface only contains one method for Get()
Get() returns a collection of Setting.

1. What should I be testing?
2.. What should I be naming the tests?

    public class SettingServiceTest
    {
        private Mock<ISettingRepository> mockRepository;
        private ISettingService service;

        [TestInitialize]
        public void Inititalize()
        {
            mockRepository = new Mock<ISettingRepository>();
            service = new SettingService(mockRepository.Object);
        }

        [TestMethod]
        public void Test_Get_Settings()
        {
            mockRepository
                 .Setup(x => x.Get())
                 .Returns(It.IsAny<List<Setting>>);

            var result = service.Get();
            mockRepository.Verify(x => x.Get());
        }
    }

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