Tirsvad
949d2edb63
200 steps of equal length, each in a random heading of 0, 90, 180 or 270 degrees and a random RGB color, with a thick line and the fastest speed. Task: MIL-004#1
111 lines
2.7 KiB
Python
111 lines
2.7 KiB
Python
import random
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import pytest
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from tests.fakes import FakePen
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from turtle_challenges.constants import (
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COLOR_CHANNEL_MAX,
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COLOR_CHANNEL_MIN,
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FASTEST_SPEED,
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WALK_HEADINGS,
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WALK_PEN_SIZE,
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WALK_STEP_DISTANCE,
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WALK_STEPS,
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)
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from turtle_challenges.random_walk import random_walk
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def test_random_walk_sets_pen_size_and_speed_before_the_first_move() -> None:
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pen = FakePen()
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random_walk(pen, rng=random.Random(1))
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assert pen.calls[0] == ("pensize", (WALK_PEN_SIZE,))
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assert pen.calls[1] == ("speed", (FASTEST_SPEED,))
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def test_random_walk_takes_the_default_number_of_equal_steps() -> None:
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pen = FakePen()
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random_walk(pen, rng=random.Random(2))
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assert pen.args_of("forward") == [(WALK_STEP_DISTANCE,)] * WALK_STEPS
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def test_random_walk_faces_only_the_four_headings() -> None:
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pen = FakePen()
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random_walk(pen, rng=random.Random(3))
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headings = {args[0] for args in pen.args_of("setheading")}
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assert headings <= set(WALK_HEADINGS)
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assert len(headings) > 1
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def test_random_walk_gives_every_step_an_rgb_color() -> None:
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pen = FakePen()
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random_walk(pen, steps=30, rng=random.Random(4))
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colors = [args[0] for args in pen.args_of("color")]
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assert len(colors) == 30
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for color in colors:
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assert isinstance(color, tuple)
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assert len(color) == 3
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assert all(
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COLOR_CHANNEL_MIN <= channel <= COLOR_CHANNEL_MAX for channel in color
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)
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def test_random_walk_picks_color_and_heading_before_each_move() -> None:
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pen = FakePen()
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random_walk(pen, steps=2, rng=random.Random(5))
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assert pen.names()[2:] == ["color", "setheading", "forward"] * 2
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def test_random_walk_is_repeatable_with_the_same_seed() -> None:
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first = FakePen()
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second = FakePen()
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random_walk(first, steps=25, rng=random.Random(8))
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random_walk(second, steps=25, rng=random.Random(8))
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assert first.calls == second.calls
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def test_random_walk_with_no_steps_only_sets_up_the_pen() -> None:
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pen = FakePen()
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random_walk(pen, steps=0)
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assert pen.names() == ["pensize", "speed"]
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def test_random_walk_works_without_a_generator() -> None:
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pen = FakePen()
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random_walk(pen, steps=3)
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assert len(pen.args_of("forward")) == 3
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def test_random_walk_rejects_negative_steps() -> None:
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pen = FakePen()
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with pytest.raises(ValueError, match="steps"):
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random_walk(pen, steps=-1)
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assert pen.calls == []
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@pytest.mark.parametrize("distance", [0, -3])
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def test_random_walk_rejects_a_distance_that_is_not_positive(distance: float) -> None:
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pen = FakePen()
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with pytest.raises(ValueError, match="distance"):
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random_walk(pen, distance=distance)
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assert pen.calls == []
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