test: hazards, ladders and one-way platforms

tests/test_hazard.py

@@ -0,0 +1,43 @@
+from game import constants
+from tests.support import makeWorld
+from game.sim.inputCommand import InputCommand
+
+
+spikeLevel = [
+    "     ",
+    "  p  ",
+    "^^^^^",
+    "XXXXX",
+]
+
+safeLevel = [
+    "     ",
+    "  p  ",
+    "     ",
+    "XXXXX",
+]
+
+
+def test_spikesDamagePlayer():
+    world = makeWorld(spikeLevel)
+    for _ in range(12):
+        world.step(InputCommand())
+    assert world.player.hp <= world.player.maxHp - 2
+    assert world.player.iframes > 0
+
+
+def test_noHazardKeepsFullHealth():
+    world = makeWorld(safeLevel)
+    for _ in range(12):
+        world.step(InputCommand())
+    assert world.player.hp == world.player.maxHp
+
+
+def test_iframesPreventDoubleHit():
+    world = makeWorld(spikeLevel)
+    for _ in range(3):
+        world.step(InputCommand())
+    hpAfterFirst = world.player.hp
+    world.step(InputCommand())
+    assert world.player.hp == hpAfterFirst
+    assert world.player.hp < world.player.maxHp