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本文以 Modern JavaScript Tutorial（本仓库）03-code-quality 章节中的一道经典测试代码审查题（"What's wrong in the test?"）为骨架，深入剖析 Mocha/Chai 测试中“一个 it 块内串联多个 assert”这一反模式的形成原因、诊断代价，并给出基于 describe 分组、it.only 隔离的标准重构方案 ...