Fix broken game test

dungeonbattle/entities/monsters.py

@@ -10,7 +10,7 @@ class Monster(FightingEntity):
         And if a player is close to the monster, the monster run on the player.
         """
         # TODO If a player is close, move to the player
-        while True:
+        for _ in range(100):
             if choice([self.move_up, self.move_down,
                       self.move_left, self.move_right])():
                 break