Phase phase = game.getPhase();
phase.placeTile(Rotation.R90, new Position(-2, 0));
assertEquals(1, game.events.size());
TileEvent ev = (TileEvent) game.events.get(0);
ev.undo(game);
game.setPhase(phase);
String s2 = snapshotGame(game);
assertEquals(s1, s2);
}