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上个月，我被拉进了一个“历史遗留项目攻坚群”。这个项目有多老？老到它的单元测试覆盖率常年趴在**21%，每次上线前，测试同学都要靠手工回归点得手指抽筋。组长拍着我的肩膀说：“给你两周，把覆盖率干到60%**以上。” 我当时的表情，大概就和看到自己写的代码在线上炸了一样——生无可恋。 硬着头皮写了两天单元测试，那叫一个痛苦。一个复杂的工具类，我要先 Mock 一堆 Service，再想各种边界条件， ...

The unified JavaScript runtime standard is an idea whose time has come. Here’s an inside look at the movement for server-side JavaScript interoperability.