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by mercurial
4277 days ago
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Say you have a system with components A and B. Functional tests let you have confidence that A works fine with B. The day you need to ensure A works with C, this confidence flies out of the window, because it's perfectly possible that functional tests pass solely because of a bug in B. It's not such a big issue if the surface of A and C is small, but writing comprehensive functional tests for a large, complex system can be daunting. |
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