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classify / cover / collect: distribution labels in the Report #8

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opened 2026-09-13 21:24:22 +09:00 by natsukium · 1 comment
natsukium commented 2026-09-13 21:24:22 +09:00
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Missing

Distribution reporting: classify cond label, cover pct label, collect value, with counts in the Report.

Why

There is no way to see what a generator actually produces: how often gen.optional yields absent, how deep gen.recursive nests, whether gen.float ever hits an edge value. Hedgehog classify / cover, fast-check statistics, Hypothesis event/target all exist for this reason, and it is the only cheap way to verify #2 / #3 / #5 behave as intended.

Suggested shape

  • A property can be wrapped: label (v: "depth=${toString (depth v)}") prop.
  • Report.labels = { "<label>" = count; }.
  • cover adds a required minimum; failing coverage fails the check (Hedgehog semantics).
  • Shares the cases list with #1 / the replay issue.
## Missing Distribution reporting: `classify cond label`, `cover pct label`, `collect value`, with counts in the `Report`. ## Why There is no way to see what a generator actually produces: how often `gen.optional` yields absent, how deep `gen.recursive` nests, whether `gen.float` ever hits an edge value. Hedgehog `classify` / `cover`, fast-check `statistics`, Hypothesis `event`/`target` all exist for this reason, and it is the only cheap way to verify #2 / #3 / #5 behave as intended. ## Suggested shape - A property can be wrapped: `label (v: "depth=${toString (depth v)}") prop`. - `Report.labels = { "<label>" = count; }`. - `cover` adds a required minimum; failing coverage fails the check (Hedgehog semantics). - Shares the `cases` list with #1 / the replay issue.
natsukium commented 2026-09-14 00:44:14 +09:00
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Implemented in c9f6ec5, pushed to main.

Implemented in c9f6ec5, pushed to main.
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natsukium/nixcheck#8
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