运行单元测试确保测试用例能继续找到并返回正确的对象。

Running unit tests assures that test case code will continue to find and return the correct objects.

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补救方法是更改代码，以强制转换为正确的对象。

The remedy is to change the code to cast correctly to the right object.

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简单地说，转换是确保数据拥有正确的对象或者类型的过程。

Simply put, it's the process of ensuring data is of the right object or type. Here are two typical conversions.

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