题目内容

请编写实现动物世界的继承关系。动物（Animal）具有行为：吃（eat）、睡觉（sleep）；动物包括：兔子（Rabbit）、老虎（Tiger）。这些动物吃的行为各不相同（兔子吃草，老虎吃肉），但睡觉的行为是一致的。请通过继承实现以上需求，并编写测试类AnimalTest进行测试

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