1# Chapter 10½: inside budget/src
2
3One file, `lib.rs`, with its tests at the bottom. In order: `day` and `date`
4(a UTC day and how to write it); `Meter`, `Hold` and `Exhausted`, with
5`Meter::hold`, `settle`, `observe` and `used`; `Which` and `key`; `Visits`,
6which admits a visitor's request or not within `VISIT_WINDOW_MS`; and the
7messages, `Ask`, `Counted`, `Status` and `Told`.
8
9> **Try it.** `cargo test -p budget`. Read the test names: they are the
10> rules in plain words, from `a_hold_is_refused_once_the_day_cannot_cover_it`
11> to `nobody_is_remembered_past_their_minute`.
12
13| File | What |
14| --- | --- |
15| [lib.rs](lib.rs) | Meters, holds, visits, and the messages; tests at the end. |
16
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