对于新代码来说，你通常只需要测试下新实现的功能就可以了。
With new code you generally only have to test the new functionality.
黑盒测试是在不了解潜在代码的情况下执行的，并且只能通过执行编译的软件来实现。
Black box testing is executed without technical knowledge of the underlying code and performed solely by executing the compiled application.
这种情况下，开发和测试团队需要付出更多宝贵的时间才能实现一个完整的、有效的系统。
In these cases, the developers and test team can lose precious time waiting for a fully integrated and functional system.
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