Tirsvad
a34bf6bbc2
Challenge 1 draws four sides and turns right 90 degrees after each. Challenge 2 puts the pen down for a dash and up for a gap and leaves it down at the end. Lengths and counts come from constants.py; invalid values raise ValueError. Task: MIL-002#3 Task: MIL-002#4 Task: MIL-002#5
77 lines
1.9 KiB
Python
77 lines
1.9 KiB
Python
import pytest
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from tests.fakes import FakePen
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from turtle_challenges.constants import DASH_COUNT, DASH_LENGTH, GAP_LENGTH
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from turtle_challenges.dashed_line import draw_dashed_line
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def test_draw_dashed_line_alternates_dash_and_gap() -> None:
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pen = FakePen()
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draw_dashed_line(pen, dash_count=2)
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assert (
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pen.calls[:-1]
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== [
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("pendown", ()),
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("forward", (DASH_LENGTH,)),
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("penup", ()),
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("forward", (GAP_LENGTH,)),
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]
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* 2
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)
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def test_draw_dashed_line_draws_the_default_number_of_dashes() -> None:
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pen = FakePen()
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draw_dashed_line(pen)
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assert pen.names().count("pendown") == DASH_COUNT + 1
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assert pen.names().count("forward") == 2 * DASH_COUNT
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def test_draw_dashed_line_leaves_the_pen_down() -> None:
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pen = FakePen()
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draw_dashed_line(pen, dash_count=3)
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assert pen.calls[-1] == ("pendown", ())
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def test_draw_dashed_line_uses_the_given_lengths() -> None:
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pen = FakePen()
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draw_dashed_line(pen, dash_count=1, dash_length=4, gap_length=7)
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assert pen.args_of("forward") == [(4,), (7,)]
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def test_draw_dashed_line_with_no_dashes_only_puts_the_pen_down() -> None:
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pen = FakePen()
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draw_dashed_line(pen, dash_count=0)
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assert pen.names() == ["pendown"]
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def test_draw_dashed_line_rejects_a_negative_count() -> None:
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pen = FakePen()
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with pytest.raises(ValueError, match="dash_count"):
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draw_dashed_line(pen, dash_count=-1)
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assert pen.calls == []
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@pytest.mark.parametrize(("dash_length", "gap_length"), [(0, 10), (10, 0), (-1, 10)])
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def test_draw_dashed_line_rejects_a_length_that_is_not_positive(
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dash_length: float, gap_length: float
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) -> None:
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pen = FakePen()
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with pytest.raises(ValueError, match="lengths"):
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draw_dashed_line(pen, dash_length=dash_length, gap_length=gap_length)
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assert pen.calls == []
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