proejct commit

tests/interaction/test_demo.py

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+"""Tests der Beispielszene."""
+
+import random
+
+from sandbox.config import INTERACTION, TIME_STEP, DemoSceneConfig, Theme
+from sandbox.demo import build_demo_scene
+from sandbox.interaction import BodyFactory, ToolSettings
+from tests.helpers import make_world
+
+
+def test_demo_scene_fits_into_the_world_and_settles() -> None:
+    world = make_world(1020, 720)
+    factory = BodyFactory(world, INTERACTION, Theme().body_palette, random.Random(0))
+    scene = DemoSceneConfig()
+    build_demo_scene(factory, ToolSettings.from_config(INTERACTION), scene)
+
+    pyramid = scene.pyramid_rows * (scene.pyramid_rows + 1) // 2
+    assert len(world.bodies) == scene.tower_levels + pyramid + scene.ball_count
+    for body in world.bodies:
+        min_x, min_y, max_x, max_y = body.bounds()
+        assert min_x >= 0 and max_x <= world.width
+        assert min_y >= 0 and max_y <= world.height
+
+    for _ in range(round(4 / TIME_STEP)):
+        world.step(TIME_STEP)
+    tower = world.bodies[: scene.tower_levels]
+    assert all(body.sleeping for body in tower)  # der Turm steht ruhig
+    tops = [body.position.y for body in tower]
+    assert tops == sorted(tops, reverse=True)  # und ist nicht eingestürzt