def test_overrides_parent_scope():
glob = Frame({'x': 2}, None)
child = Frame({}, glob)
child['x'] = 3
assert glob['x'] == 3
child['b'] = 3
assert not glob.get('b')
def test_getitem():
glob = Frame({'x': 2}, None)
frame = Frame({'y': 3}, glob)
assert frame.get('x') == 2
def test_get():
glob = Frame({'x': 2}, None)
Frame({'y': 2, 'a': 3}, glob)
assert not glob.get('z')