def test_write_existing_file(self, mocker: MockerFixture, fake_files):
mock_open = mocker.mock_open()
mocker.patch("builtins.open", mock_open)
mocker.patch.object(Path, "exists", side_effect=[True])
open_latest("/path/to/file", mode="w")
mock_open.assert_called_once_with(Path("/path/to/file-4"),
mode="w",
encoding="utf-8")
def test_should_open_in_append_mode_by_default(self, mocker: MockerFixture,
fake_files):
mock_open = mocker.mock_open()
mocker.patch("builtins.open", mock_open)
for _ in enumerate(open_latest("/path/to/foo.txt")):
assert mock_open.call_args.kwargs["mode"] == "a"
def test_write_no_such_file(self, mocker: MockerFixture, fake_files):
mocker.patch("builtins.open", mocker.mock_open())
mocker.patch.object(Path, "exists", side_effect=[False])
open_latest("/path/to/no-such-file", mode="w")
def test_read_no_such_file(self, mocker: MockerFixture, fake_files):
mocker.patch.object(Path, "exists", side_effect=[False])
with pytest.raises(FileNotFoundError):
open_latest("/path/to/no-such-file", mode="r")