def test_invert():
rl = RL([RD({'a': {'x': [1, 2], 'y': [3, 4]}})])
assert rl.invert('a') == [{'a': [{'x': 1, 'y': 3},
{'x': 2, 'y': 4}]}]
rd = RD({'a': RD({'b': RD({'c': [1, 2], 'd': [3, 4]})})})
assert rd.invert('a', 'b') == {'a': {'b': [{'c': 1, 'd': 3},
{'c': 2, 'd': 4}]}}
def test_nest():
rl = RL([RD({'a': 1, 'b': 100, 'c_x_p': 10, 'c_x_q': 15, 'c_y': 20})])
r = rl.nest('c').nest('c', 'x')
assert r == [{'a': 1, 'b': 100, 'c': {'x': {'p': 10, 'q': 15}, 'y': 20}}]
def test_nest_list():
rl = RL([RD({'a_x': '1,2', 'a_y': '4,5'})])
assert rl.nest_list('a') == [{'a': [{'x': '1', 'y': '4'},
{'x': '2', 'y': '5'}]}]
def test_split():
rl = RL([RD({'a': RD({'b': '1,2,3'})})])
assert rl.split('a', 'b') == [{'a': {'b': ['1', '2', '3']}}]