Every module in the dealer ends with a `module.exports` guard, so they were all
written to be testable, and none of them were ever tested. The correctness fixes
that went in recently were checked by hand in a browser console that has since
been closed. This puts a real safety net under them and clears out the
duplication that made those bugs possible in the first place.
Tests (58, ~300ms, no dependencies)
Node's built-in runner, no package.json and no install step: the modules are
plain script-tag files, so `load.js` just requires them and puts them on
globalThis under the names they use to find each other in the page.
The randomised suite is the part that matters. Every bug found in this tool so
far has been shape-dependent — blinds posted to empty chairs, the button
skipping players, heads-up acting out of order — and none of them show up on the
full six-handed table anyone would write a fixed example for. It deals 1000
hands per property across random seat counts, empty chairs, stack depths and
dealer input, checking that chips are never created or destroyed, that the pot
breakdown plus uncalled returns equals the money in, that paying out settles to
the cent, and that the button and blinds always land on real players. The
generator is seeded so a failure reproduces instead of flaking.
One implementation each
- `Math.round(x * 100) / 100` was written out 16 times across 6 files. It's
`Money.round` / `toCents` / `fromCents` now, in the module both pages already
load first.
- The chip epsilon was declared twice with the same value under two names
(`PotCalculator.EPSILON`, `Betting.EPSILON_CHIPS`). Both now point at
`Money.EPSILON`.
- `Betting.seatAt` and `HoldemState.nextSeatIndex` were the same modular
arithmetic written twice. Walking the seats is exactly where the button, the
blinds and the action drifted apart from each other before, so there is one
of it now.
- The undo snapshot/restore dance appeared three times in main.js, each one
re-deleting every key on `state` in place. It's `snapshotState` /
`restoreState` once, with the reason it can't just reassign written down.
A bug the tests found
`layers()` and `uncalledReturns()` both decide what money was never contested,
separately, and disagreed. `uncalledReturns` measured each player against the
biggest live contribution *including their own*, which makes the biggest bet its
own yardstick — so the one case it exists for came back empty, and `layers()`
announced the overbet as a side pot only the bettor could win.
With Ann shoving 200 into Ben's 60, the dealer was told "main pot 4, side pot 3,
side pot 116, side pot 140" — four pots, one of them fictional. It now reads
"main pot 123, uncalled 140 back to Ann", which is what a dealer says out loud.
Layers are derived from contributions with the uncalled money already removed,
so the two can't disagree again. A band every payer folded out of is now merged
into the pot below rather than dropped, which was quietly shrinking the
announced pot in another edge case.
Validated with Playwright against a real hand on both surfaces — the table's
live pot readout and Quick Split's all-in mode — plus undo, with no console
errors.
Co-Authored-By: Claude Opus 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_015bnp7xKUPFFSpwkYNFaPgb
The dealer table is a two-handed, big-screen tool. A dealer standing over a
chopped pot with a phone in one hand and players waiting needs an answer in
seconds, not a table to set up first — so /casino/texasholdem/quicksplit is
the whole job on one screen: type the pot, tap how many ways, tap the
smallest chip in play, read the payout. Nothing to configure, nothing saved.
It splits in whole chips rather than raw arithmetic, because a dealer can't
push half a chip across the felt: everyone gets the same stack and the
remainder is called out as odd chips going one at a time to the first
players left of the button. A pot that doesn't divide into the chosen
denomination says so instead of quietly hiding the difference.
Money formatting moves out of render.js into its own file so this screen can
use it without pulling in the whole seat/chip UI.
Co-Authored-By: Claude Sonnet 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_015bnp7xKUPFFSpwkYNFaPgb
jheapsandClaude Opus 5