def test_AliasKeyDict():
alias_dict = AliasKeyDict({'a': 'b', 'c': 'd'})
alias_dict.add_alias('alias_a', 'a')
assert len(alias_dict) == 2
assert set(alias_dict.items()) == set([('a', 'b'), ('c', 'd')])
assert 'alias_a' in alias_dict
assert alias_dict['alias_a'] is alias_dict['a']
assert alias_dict.get('alias_a') is alias_dict.get('a')
assert alias_dict.get('f', 'not there') == 'not there'
assert alias_dict.pop('alias_a') == 'b'
assert len(alias_dict) == 1
assert 'a' not in alias_dict
assert 'alias_a' not in alias_dict
def test_AliasKeyDict_copy():
alias_dict = AliasKeyDict([('foo', 'bar')])
alias_dict.add_alias('baz', 'foo')
dict_copy = alias_dict.copy()
assert set(dict_copy.items()) == set(alias_dict.items())
assert dict_copy.alias_to_key == alias_dict.alias_to_key
