def test_return_new_object():
"""Should return new object, arguments should not be modified"""
left = {
"key_1": {
"one": {"a", "b"},
"two": "left_value",
},
"key_2": [1, 2],
}
right = {"key_1": {"two": "right_value", "three": [1, 2, 3]}, "key_2": [3]}
expected_result = {
"key_1": {
"one": {"a", "b"},
"two": "right_value",
"three": [1, 2, 3]
},
"key_2": [1, 2, 3]
}
result = deep_merge(deepcopy(left), deepcopy(right))
assert left == left
assert right == right
assert result == expected_result
def test_lists():
left = [1, 2, 3]
right = [4, 2, 1]
result = deep_merge(left, right)
assert result == [1, 2, 3, 4, 2, 1]
def test_sets():
left = {1, 2, 3}
right = {4, 2, 1}
result = deep_merge(left, right)
assert result == {1, 2, 3, 4}