164 lines
5.2 KiB
Python
164 lines
5.2 KiB
Python
"""Tests of the constants that the day-20, day-21 and day-24 lectures fix."""
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from snake_game import constants
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HALF_WIDTH = constants.SCREEN_WIDTH / 2
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HALF_HEIGHT = constants.SCREEN_HEIGHT / 2
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def test_screen_size_matches_lecture() -> None:
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assert (constants.SCREEN_WIDTH, constants.SCREEN_HEIGHT) == (600, 600)
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def test_screen_is_black_and_titled_as_in_the_lecture() -> None:
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assert constants.SCREEN_BACKGROUND_COLOR == "black"
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assert constants.SCREEN_TITLE == "My Snake Game"
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def test_body_segments_are_light_green_squares() -> None:
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assert constants.SEGMENT_SHAPE == "square"
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assert constants.BODY_COLOR == "light green"
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def test_segment_color_no_longer_exists() -> None:
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assert not hasattr(constants, "SEGMENT_COLOR")
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def test_head_is_dark_green_and_differs_from_the_body() -> None:
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assert constants.HEAD_COLOR == "dark green"
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assert constants.HEAD_COLOR != constants.BODY_COLOR
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def test_head_shape_has_a_name_that_is_not_a_built_in_shape() -> None:
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assert constants.HEAD_SHAPE == "snake_head"
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assert constants.HEAD_SHAPE != constants.SEGMENT_SHAPE
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def test_head_is_the_20_by_20_square() -> None:
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assert constants.HEAD_OUTLINE == ((-10, -10), (-10, 10), (10, 10), (10, -10))
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xs = {x for x, _ in constants.HEAD_OUTLINE}
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ys = {y for _, y in constants.HEAD_OUTLINE}
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assert max(xs) - min(xs) == max(ys) - min(ys) == 20
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def test_mouth_lies_on_the_front_edge_and_inside_the_head() -> None:
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front = max(y for _, y in constants.HEAD_OUTLINE)
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half = max(x for x, _ in constants.HEAD_OUTLINE)
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assert constants.MOUTH_OUTLINE == ((-6, 10), (0, 2), (6, 10))
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assert any(y == front for _, y in constants.MOUTH_OUTLINE)
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assert all(
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abs(x) <= half and -half <= y <= front for x, y in constants.MOUTH_OUTLINE
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)
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def test_mouth_is_the_colour_of_the_background() -> None:
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assert constants.MOUTH_COLOR == constants.SCREEN_BACKGROUND_COLOR
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def test_snake_starts_with_three_segments_at_the_lecture_positions() -> None:
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assert constants.STARTING_POSITIONS == ((0, 0), (-20, 0), (-40, 0))
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def test_starting_positions_are_distinct_on_one_row() -> None:
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positions = constants.STARTING_POSITIONS
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assert len(set(positions)) == len(positions)
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assert len({y for _, y in positions}) == 1
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def test_starting_positions_run_from_head_to_tail_leftwards() -> None:
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x_values = [x for x, _ in constants.STARTING_POSITIONS]
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assert x_values == sorted(x_values, reverse=True)
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def test_starting_positions_are_one_move_distance_apart() -> None:
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x_values = [x for x, _ in constants.STARTING_POSITIONS]
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gaps = {left - right for left, right in zip(x_values, x_values[1:], strict=False)}
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assert gaps == {constants.MOVE_DISTANCE}
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def test_starting_positions_are_inside_the_screen() -> None:
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assert all(
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abs(x) < HALF_WIDTH and abs(y) < HALF_HEIGHT
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for x, y in constants.STARTING_POSITIONS
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)
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def test_move_distance_is_twenty_pixels() -> None:
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assert constants.MOVE_DISTANCE == 20
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def test_directions_match_the_lecture_headings() -> None:
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assert constants.UP == 90
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assert constants.DOWN == 270
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assert constants.LEFT == 180
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assert constants.RIGHT == 0
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def test_four_directions_are_distinct() -> None:
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directions = (constants.UP, constants.DOWN, constants.LEFT, constants.RIGHT)
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assert len(set(directions)) == len(directions)
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def test_opposite_directions_differ_by_half_a_turn() -> None:
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assert (constants.UP - constants.DOWN) % 360 == 180
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assert (constants.LEFT - constants.RIGHT) % 360 == 180
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def test_refresh_delay_is_a_tenth_of_a_second() -> None:
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assert constants.REFRESH_DELAY_SECONDS == 0.1
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def test_food_is_a_small_blue_circle_without_animation() -> None:
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assert constants.FOOD_SHAPE == "circle"
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assert constants.FOOD_SIZE == 0.5
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assert constants.FOOD_COLOR == "blue"
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assert constants.FOOD_SPEED == "fastest"
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def test_wall_is_inside_the_screen() -> None:
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assert 0 < constants.WALL_LIMIT < HALF_WIDTH
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assert constants.WALL_LIMIT < HALF_HEIGHT
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def test_wall_is_280_pixels_from_the_centre() -> None:
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assert constants.WALL_LIMIT == 280
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def test_food_is_eaten_closer_than_15_pixels_which_is_less_than_a_move() -> None:
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assert constants.FOOD_COLLISION_DISTANCE == 15
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assert constants.FOOD_COLLISION_DISTANCE < constants.MOVE_DISTANCE
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def test_scoreboard_is_white_text_at_the_top_centre_inside_the_screen() -> None:
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x, y = constants.SCOREBOARD_POSITION
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assert constants.SCOREBOARD_COLOR == "white"
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assert constants.SCOREBOARD_ALIGNMENT == "center"
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assert (x, y) == (0, 270)
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assert abs(x) < HALF_WIDTH
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assert 0 < y < HALF_HEIGHT
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def test_scoreboard_text_is_score_label_and_arial_24() -> None:
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assert constants.SCORE_LABEL == "Score: "
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assert constants.SCOREBOARD_FONT == ("Arial", 24, "normal")
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def test_tail_is_touched_closer_than_10_pixels_which_is_less_than_a_move() -> None:
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assert constants.TAIL_COLLISION_DISTANCE == 10
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assert 0 < constants.TAIL_COLLISION_DISTANCE < constants.MOVE_DISTANCE
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def test_game_over_text_is_written_at_the_centre_inside_the_wall() -> None:
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x, y = constants.GAME_OVER_POSITION
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assert constants.GAME_OVER_TEXT == "GAME OVER"
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assert (x, y) == (0, 0)
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assert abs(x) < constants.WALL_LIMIT
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assert abs(y) < constants.WALL_LIMIT
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