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Dev builds content extraction API, finds passing tests masked three critical flaws

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A developer building a web content extraction API discovered that three seemingly passing checks concealed serious underlying problems in the system. A benchmark showing 90% extraction success was misleading because 40 of the 100 test URLs were homepages and index pages, not articles, skewing results. A sandboxing test passed incorrectly because the test environment inherited the same insecure flag it was meant to verify had been removed. A third issue involved a shared browser cache across environments, causing CI failures that appeared local but were actually real infrastructure problems. The developer concluded that any check sharing a core assumption with the system it tests cannot reliably detect failures, and recommends deliberately making checks fail before trusting them.

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