def test__removals_nor_changes__returns_no_items__when_item_is_put_back():
d = IdMapper({"a": 1})
del d["a"]
d["a"] = 1
assert [(k, v) for k, v in d.removals()] == []
assert [(k, v) for k, v in d.additions()] == []
assert [(k, v) for k, v in d.changes()] == []
def test__changes__returns_item__when_it_is_first_deleted_and_then_changed():
d = IdMapper({"a": 1})
del d["a"]
d["a"] = 2
assert [(k, v) for k, v in d.removals()] == []
assert [(k, v) for k, v in d.additions()] == []
assert [(k, v) for k, v in d.changes()] == [("a", 2)]
def test__changes__returns_changed_items__when_changed_using_reverse_map():
d = IdMapper({"b": 2})
d.reverse[3] = "b"
assert [(k, v) for k, v in d.changes()] == [("b", 3)]
def test__changes__returns_none__when_value_has_not_changed():
d = IdMapper({"b": 2})
d["b"] = 2
assert [(k, v) for k, v in d.changes()] == []
def test__changes__returns_changed_items():
d = IdMapper({"b": 2})
d["b"] = 3
assert [(k, v) for k, v in d.changes()] == [("b", 3)]