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python -m turtle_challenges <challenge> and the turtle-challenges command open a window, run the named challenge and wait for a click. square and dashed-line are registered; a missing Tk is reported with a hint instead of a traceback. Task: MIL-002#6
98 lines
2.7 KiB
Python
98 lines
2.7 KiB
Python
import pytest
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from tests.fakes import FakePen, FakeWindow
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from turtle_challenges import cli
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from turtle_challenges.constants import (
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CHALLENGE_NAMES,
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DASH_COUNT,
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SQUARE_SIDES,
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)
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from turtle_challenges.pen import Pen, Window
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from turtle_challenges.window import TurtleUnavailableError
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@pytest.fixture
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def fake_pen_and_window(monkeypatch: pytest.MonkeyPatch) -> tuple[FakePen, FakeWindow]:
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"""Replace the turtle window and pen of the command line with fakes."""
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pen = FakePen()
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window = FakeWindow()
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def create_fake_window() -> Window:
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return window
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def create_fake_pen() -> Pen:
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return pen
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monkeypatch.setattr(cli, "create_window", create_fake_window)
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monkeypatch.setattr(cli, "create_pen", create_fake_pen)
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return pen, window
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def test_every_challenge_name_has_a_challenge() -> None:
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challenges = cli.build_challenges(FakePen())
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assert set(challenges) == set(CHALLENGE_NAMES)
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@pytest.mark.parametrize("name", CHALLENGE_NAMES)
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def test_parser_accepts_every_challenge_name(name: str) -> None:
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args = cli.build_parser().parse_args([name])
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assert args.challenge == name
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def test_parser_rejects_an_unknown_challenge(
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capsys: pytest.CaptureFixture[str],
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) -> None:
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with pytest.raises(SystemExit) as exit_info:
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cli.build_parser().parse_args(["triangle"])
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assert exit_info.value.code == 2
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assert "invalid choice" in capsys.readouterr().err
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def test_help_lists_every_challenge(capsys: pytest.CaptureFixture[str]) -> None:
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with pytest.raises(SystemExit) as exit_info:
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cli.build_parser().parse_args(["--help"])
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assert exit_info.value.code == 0
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output = capsys.readouterr().out
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assert all(name in output for name in CHALLENGE_NAMES)
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def test_main_runs_the_square_and_waits_for_a_click(
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fake_pen_and_window: tuple[FakePen, FakeWindow],
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) -> None:
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pen, window = fake_pen_and_window
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status = cli.main(["square"])
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assert status == 0
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assert len(pen.args_of("forward")) == SQUARE_SIDES
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assert window.waited_for_click
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def test_main_runs_the_dashed_line(
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fake_pen_and_window: tuple[FakePen, FakeWindow],
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) -> None:
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pen, _ = fake_pen_and_window
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cli.main(["dashed-line"])
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assert len(pen.args_of("forward")) == 2 * DASH_COUNT
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def test_main_reports_a_missing_turtle_and_exits_with_status_1(
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monkeypatch: pytest.MonkeyPatch, capsys: pytest.CaptureFixture[str]
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) -> None:
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def fail() -> Window:
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raise TurtleUnavailableError("no Tk here")
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monkeypatch.setattr(cli, "create_window", fail)
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with pytest.raises(SystemExit) as exit_info:
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cli.main(["square"])
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assert exit_info.value.code == 1
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assert "no Tk here" in capsys.readouterr().err
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