def METHOD_NAME(self):
    class TestItem(Item):
        name = Field()
    assert hasattr(arg_to_iter(None), "__iter__")
    assert hasattr(arg_to_iter(100), "__iter__")
    assert hasattr(arg_to_iter("lala"), "__iter__")
    assert hasattr(arg_to_iter([1, 2, 3]), "__iter__")
    assert hasattr(arg_to_iter(c for c in "abcd"), "__iter__")
    self.assertEqual(list(arg_to_iter(None)), [])
    self.assertEqual(list(arg_to_iter("lala")), ["lala"])
    self.assertEqual(list(arg_to_iter(100)), [100])
    self.assertEqual(list(arg_to_iter(c for c in "abc")), ["a", "b", "c"])
    self.assertEqual(list(arg_to_iter([1, 2, 3])), [1, 2, 3])
    self.assertEqual(list(arg_to_iter({"a": 1})), [{"a": 1}])
    self.assertEqual(
        list(arg_to_iter(TestItem(name="john"))), [TestItem(name="john")]
    )