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📜 WAYPOINT LESSON

Checkpoint: Testing

⭐⭐ intermediate⏳ 15 min read📍 Lesson 93 of 180

Graded checkpoint: a rolling-window rate limiter whose time is fully controlled by an advanceable clock seam.

Checkpoint — testing

You can now: structure AAA tests that read like specs, freeze time behind seams, and ship boundary nets as deliverables. Prove it with a rate limiter designed for testability.