请问HN：关于单元测试和测试驱动开发（TDD）的书籍推荐？
我目前的情况是，我理解单元测试的重要性以及测试驱动开发（TDD）的工作原理，但在实际操作中，我并没有太多机会去实践。我的工作技术并不太适合这种测试方式。
尽管如此，我还是希望找到一些关于这些主题的阅读材料，这些材料不仅仅涵盖基础知识，还能深入探讨，以便我能尽量获取一些如果我定期进行这些实践所能获得的高级经验。
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I'm in a situation where I understand the importance of unit testing and how TDD works, but in practice I don't actually get to do it much. The technology I'm working in isn't really testable in this way.<p>That being said I'm interested in locating some reading material on these topics that don't just cover the basics, but do so with a little more depth so I can hopefully glean some of the senior level experience I'd get if I was actually doing it regularly.