def test_delitem():
d = {'x': 1}
monkeypatch = MonkeyPatch()
monkeypatch.delitem(d, 'x')
assert 'x' not in d
monkeypatch.delitem(d, 'y', raising=False)
pytest.raises(KeyError, "monkeypatch.delitem(d, 'y')")
assert not d
monkeypatch.setitem(d, 'y', 1700)
assert d['y'] == 1700
d['hello'] = 'world'
monkeypatch.setitem(d, 'x', 1500)
assert d['x'] == 1500
monkeypatch.undo()
assert d == {'hello': 'world', 'x': 1}
def test_delitem():
d = {'x': 1}
monkeypatch = MonkeyPatch()
monkeypatch.delitem(d, 'x')
assert 'x' not in d
monkeypatch.delitem(d, 'y', raising=False)
pytest.raises(KeyError, "monkeypatch.delitem(d, 'y')")
assert not d
monkeypatch.setitem(d, 'y', 1700)
assert d['y'] == 1700
d['hello'] = 'world'
monkeypatch.setitem(d, 'x', 1500)
assert d['x'] == 1500
monkeypatch.undo()
assert d == {'hello': 'world', 'x': 1}
