public void GivenAValidFIleExtension_ThenIsAllowedIsTrue()
        {
            var model = new NewMediaViewModel();

            Assert.IsTrue(model.IsAllowed("jpg"));
        }
        public void GivenAInvalidFIleExtension_ThenIsAllowedIsFalse()
        {
            var model = new NewMediaViewModel();

            Assert.IsFalse(model.IsAllowed("txt"));
        }