Tirsvad
e2249de46e
The drawing functions take a Pen, the part of turtle.Turtle they use, so a test can pass a fake that records every call. window.py is the only module that imports turtle, and it does so inside the functions so that importing the package needs no Tk. Task: MIL-002#1 Task: MIL-002#2
34 lines
928 B
Python
34 lines
928 B
Python
import sys
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import pytest
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from turtle_challenges.window import (
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TURTLE_UNAVAILABLE_MESSAGE,
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TurtleUnavailableError,
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create_pen,
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create_window,
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)
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@pytest.fixture
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def without_turtle(monkeypatch: pytest.MonkeyPatch) -> None:
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"""Make `import turtle` fail, as on a Python without Tk."""
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monkeypatch.setitem(sys.modules, "turtle", None)
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def test_create_window_reports_a_missing_turtle(without_turtle: None) -> None:
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with pytest.raises(TurtleUnavailableError) as error_info:
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create_window()
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assert str(error_info.value) == TURTLE_UNAVAILABLE_MESSAGE
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assert isinstance(error_info.value.__cause__, ImportError)
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def test_create_pen_reports_a_missing_turtle(without_turtle: None) -> None:
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with pytest.raises(TurtleUnavailableError):
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create_pen()
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def test_the_missing_turtle_message_names_the_debian_package() -> None:
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assert "python3-tk" in TURTLE_UNAVAILABLE_MESSAGE
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