They should provide support for standard version control systems such as Subversion (SVN) and the ability to auto-complete, document, debug, refactor, profile, and unit test all code.

它们应该提供对Subversion (SVN)这样的标准版本控制系统的支持，并支持自动完成、调试、重构、配置所有代码及其文档记录和单元测试。

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Some services (for example, those implemented using mainframe or ERP systems) may not be available to developers in unit test environments.

在单元测试环境中，有些服务（例如，那些使用大型机或 ERP 系统实现的服务）可能对开发人员不可用。

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Unit testing and test-driven development are excellent tools for managing such fragile systems with confidence, but they only work if you use them.

单元测试和测试驱动的开发这些出色的工具使您可以信心十足地管理此类脆弱系统 —— 但只有在您确实使用了这些工具时，它们才能发挥作用。

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