def test_required_tag_empty(tag):
char = Changeling(type=['changeling'], **{tag: [' \t']})
char.validate()
assert "No values for tag '{}'".format(tag) in char.problems
def test_single_tags(key, values):
char = Changeling(type=['changeling'], **{key: values})
char.validate(strict=True)
assert "Too many values for tag '{}'. Limit of 1".format(
key) in char.problems
def test_required_tag_present(tag):
char = Changeling(type=['changeling'], **{tag: ['hi']})
char.validate()
assert "No values for tag '{}'".format(tag) not in char.problems
