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"));
 }