Characteristics of good unit tests¶
still around, although declining in use, in the 1970s. The 3612 had a slot on
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郭晓东：以前我会觉得不好意思，怕他们会用另外一种眼光看我。有一次我们全班组织献血，献完之后，我拿到了钱。我心想，终于可以好好吃一顿了，可以点个肉吃。后来我看大家都没有，就我拿了，我就坚持把那个钱还回去了。
One in three eighth graders scored “below basic” in reading on last year’s National Assessment of Educational Progress report—the largest share in the exam’s three-decade history. Among fourth graders, 40% landed at that bottom level, the worst showing in 20 years. Math scores have followed a similar downward trajectory.
These optimizations are difficult to implement, frequently error-prone, and lead to inconsistent behavior across runtimes. Bun's "Direct Streams" optimization takes a deliberately and observably non-standard approach, bypassing much of the spec's machinery entirely. Cloudflare Workers' IdentityTransformStream provides a fast-path for pass-through transforms but is Workers-specific and implements behaviors that are not standard for a TransformStream. Each runtime has its own set of tricks and the natural tendency is toward non-standard solutions, because that's often the only way to make things fast.