def test_validator_positive_result(self):
chk_lst = ['1', '2', '3', '4']
func_result = envelopes.validator(chk_lst)
self.assertEqual(func_result, chk_lst)
def test_validator_chars_but_int(self):
chk_lst = ['1', '2', 's', '4']
func_result = envelopes.validator(chk_lst)
self.assertEqual(func_result, None)
def test_validator_negative_value(self):
chk_lst = ['-1', '2', '3', '4']
func_result = envelopes.validator(chk_lst)
self.assertEqual(func_result, None)
def test_validator_zero_value(self):
chk_lst = ['1', '0', '3', '4']
func_result = envelopes.validator(chk_lst)
self.assertEqual(func_result, None)
def test_validator_blank_item(self):
chk_lst = ['1', '2', '3', '']
func_result = envelopes.validator(chk_lst)
self.assertEqual(func_result, None)