Tirsvad
32861fc58f
draw_shape turns 360 divided by the number of sides after each side and rejects fewer than 3 sides. draw_shapes draws a triangle up to a decagon, each in a color from the palette. Task: MIL-003#3 Task: MIL-003#4 Task: MIL-003#5
95 lines
2.3 KiB
Python
95 lines
2.3 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_PALETTE,
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FULL_TURN_DEGREES,
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MAX_POLYGON_SIDES,
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MIN_POLYGON_SIDES,
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POLYGON_SIDE_LENGTH,
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)
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from turtle_challenges.shapes import draw_shape, draw_shapes
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SIDE_COUNTS = range(MIN_POLYGON_SIDES, MAX_POLYGON_SIDES + 1)
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@pytest.mark.parametrize("num_sides", SIDE_COUNTS)
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def test_draw_shape_draws_every_side_at_the_default_length(num_sides: int) -> None:
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pen = FakePen()
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draw_shape(pen, num_sides)
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assert pen.args_of("forward") == [(POLYGON_SIDE_LENGTH,)] * num_sides
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@pytest.mark.parametrize("num_sides", SIDE_COUNTS)
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def test_draw_shape_turns_a_full_lap_in_equal_steps(num_sides: int) -> None:
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pen = FakePen()
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draw_shape(pen, num_sides)
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expected_angle = FULL_TURN_DEGREES / num_sides
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assert pen.args_of("right") == [(expected_angle,)] * num_sides
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def test_draw_shape_turns_72_degrees_for_a_pentagon() -> None:
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pen = FakePen()
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draw_shape(pen, 5)
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assert pen.args_of("right")[0] == (72,)
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def test_draw_shape_uses_the_given_side_length() -> None:
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pen = FakePen()
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draw_shape(pen, 3, side_length=25)
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assert pen.args_of("forward") == [(25,)] * 3
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@pytest.mark.parametrize("num_sides", [-1, 0, 1, 2])
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def test_draw_shape_rejects_fewer_than_three_sides(num_sides: int) -> None:
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pen = FakePen()
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with pytest.raises(ValueError, match="num_sides"):
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draw_shape(pen, num_sides)
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assert pen.calls == []
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def test_draw_shape_rejects_a_side_that_is_not_positive() -> None:
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pen = FakePen()
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with pytest.raises(ValueError, match="side_length"):
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draw_shape(pen, 4, side_length=0)
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def test_draw_shapes_draws_a_triangle_up_to_a_decagon() -> None:
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pen = FakePen()
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draw_shapes(pen, random.Random(5))
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assert len(pen.args_of("forward")) == sum(SIDE_COUNTS)
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assert len(pen.args_of("color")) == len(SIDE_COUNTS)
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def test_draw_shapes_sets_a_palette_color_before_each_shape() -> None:
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pen = FakePen()
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draw_shapes(pen, random.Random(6))
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colors = [args[0] for args in pen.args_of("color")]
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assert all(color in COLOR_PALETTE for color in colors)
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assert pen.names()[0] == "color"
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def test_draw_shapes_works_without_a_generator() -> None:
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pen = FakePen()
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draw_shapes(pen)
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assert len(pen.args_of("color")) == len(SIDE_COUNTS)
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