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