Create a new console application called CountryTest by selecting File | new | Project in Visual Studio.

在Visual Studio里选择文件|新建|项目菜单新建一个控制台应用程序，取名为CountryTest。

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First add to the project the reference to CountryLib.dll and rebuild the console application, CountryTest.

首先我们为项目添加引用CountryLib . dll，然后重新编译控制台应用程序CountryTest。

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Think about how CountryList could process user interface events (mouse click, keyboard) in a way that could be both tested by CountryTest and used by CountryApp.

考虑一下CountryList怎样才能处理用户接口事件(鼠标单击，键盘)，并通过这个方法使其能够被CountryTest测试，并被CountryApp使用。

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Think about how CountryList could process user interface events (mouse click, keyboard) in a way that could be both tested by CountryTest and used by CountryApp.

考虑一下CountryList怎样才能处理用户接口事件(鼠标单击，键盘)，并通过这个方法使其能够被CountryTest测试，并被CountryApp使用。

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