test: physics and player movement coverage

tests/test_physics.py

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+import pytest
+
+from game import constants
+from tests.support import makeWorld, stepWorld, settle
+from game.sim.inputCommand import InputCommand
+
+
+def test_gravityAppliesWhenAirborne():
+    world = makeWorld([
+        "      ",
+        " p    ",
+        "      ",
+        "      ",
+        "XXXXXX",
+    ])
+    world.step(InputCommand())
+    assert world.player.vy == pytest.approx(constants.gravity)
+
+
+def test_playerLandsOnGround():
+    world = makeWorld([
+        "      ",
+        " p    ",
+        "      ",
+        "XXXXXX",
+    ])
+    settle(world, 40)
+    player = world.player
+    assert player.onGround
+    assert player.vy == 0.0
+    assert player.bottom == pytest.approx(48.0)
+
+
+def test_fallSpeedIsCapped():
+    tall = ["          "] * 40
+    tall[1] = " p        "
+    tall.append("XXXXXXXXXX")
+    world = makeWorld(tall)
+    maxSeen = 0.0
+    for _ in range(35):
+        world.step(InputCommand())
+        maxSeen = max(maxSeen, world.player.vy)
+    assert maxSeen <= constants.maxFallSpeed + 1e-6
+    assert maxSeen == pytest.approx(constants.maxFallSpeed)
+
+
+def test_wallBlocksHorizontalMovement():
+    world = makeWorld([
+        "   #",
+        " p #",
+        "XXXX",
+    ])
+    stepWorld(world, 40, right=True, run=True)
+    player = world.player
+    wallLeft = 3 * constants.tileSize
+    limit = wallLeft - player.w
+    assert player.x <= limit + 0.01
+    assert player.vx == 0.0
+    assert player.onWallRight
+
+
+def test_ceilingStopsUpwardMovement():
+    world = makeWorld([
+        "XXXX",
+        "    ",
+        " p  ",
+        "XXXX",
+    ])
+    hitCeiling = False
+    world.step(InputCommand(jump=True, jumpHeld=True))
+    for _ in range(12):
+        world.step(InputCommand(jumpHeld=True))
+        if world.player.onCeiling:
+            hitCeiling = True
+            assert world.player.top >= constants.tileSize - 0.01
+    assert hitCeiling