JoshHeaps.Net/tests/holdem/aimingTheBlinds.test.js

// Saying who the blind is, before saying "cards".
//
// A dealer sets the table up out loud — button here, she's the small blind, he's the
// big blind — and only then deals. The seat menu offers "Make small blind" for exactly
// that, and it was answering by dealing the hand: betting opened, two stacks docked,
// the action bar up and waiting on the seat after the big blind. The dealer had said
// where the blinds go, and the tool heard "deal".
//
// The condition it was asking is `onlyBlindsIn`, which means "nothing has happened in
// this hand except the blinds" — true of a hand one second old, and equally true of a
// table in setup with no cards out and nothing committed. Those two need telling apart,
// which is what `blindsArePosted` is for.
const test = require("node:test");
const { describe } = require("node:test");
const assert = require("node:assert");
const { Betting, HoldemState, makeTable, chipsOnTable } = require("./load");

describe("before the deal", () => {
    test("the blinds are not down, however much the table looks ready", () => {
        const state = makeTable({ seatCount: 6, seated: [0, 1, 2, 3] });
        assert.equal(state.bettingOpen, false);
        // The old condition, on its own, says yes here — this is the whole bug.
        assert.equal(Betting.onlyBlindsIn(state), true);
        assert.equal(Betting.blindsArePosted(state), false);
    });

    test("a table straight out of setup, with nobody seated, is the same answer", () => {
        assert.equal(Betting.blindsArePosted(HoldemState.createDefault()), false);
    });

    test("re-posting would have dealt the hand, which is why it is guarded", () => {
        // Not a rule, a demonstration: repostBlinds ends in beginHand. Calling it in
        // setup is the deal, and nothing about naming a blind should reach it.
        const state = makeTable({ seatCount: 6, seated: [0, 1, 2, 3] });
        Betting.repostBlinds(state);
        assert.equal(state.bettingOpen, true, "chips off two stacks and the action bar up");
        assert.notEqual(state.actingSeatIndex, null);
    });

    test("naming a blind moves a badge and no chips", () => {
        const state = makeTable({ seatCount: 6, seated: [0, 1, 2, 3] });
        const before = chipsOnTable(state);

        // What the seat menu does: pin the override, repost only if the blinds are down.
        state.blindOverride = { sbIndex: 3, bbIndex: 0 };
        if (Betting.blindsArePosted(state)) Betting.repostBlinds(state);

        assert.equal(state.bettingOpen, false, "still setup — the dealer hasn't dealt");
        assert.equal(state.actingSeatIndex, null, "nobody is being asked to act");
        assert.deepEqual(state.seats.map(p => Betting.committed(p)), [0, 0, 0, 0, 0, 0]);
        assert.equal(chipsOnTable(state), before);

        // And the badges say what the dealer just said.
        const blinds = HoldemState.getBlindSeats(state);
        assert.equal(blinds.sbIndex, 3);
        assert.equal(blinds.bbIndex, 0);
    });

    test("and the hand that follows posts from where they were aimed", () => {
        const state = makeTable({ seatCount: 6, seated: [0, 1, 2, 3], smallBlind: 1, bigBlind: 2 });
        state.blindOverride = { sbIndex: 3, bbIndex: 0 };
        if (Betting.blindsArePosted(state)) Betting.repostBlinds(state);

        Betting.beginHand(state);
        assert.equal(Betting.committed(state.seats[3]), 1);
        assert.equal(Betting.committed(state.seats[0]), 2);
    });

    test("giving the button away is a marker moving too", () => {
        const state = makeTable({ seatCount: 6, seated: [0, 1, 2, 3] });
        const before = chipsOnTable(state);

        const willRepost = Betting.blindsArePosted(state);
        state.dealerSeatIndex = 2;
        if (willRepost) Betting.repostBlinds(state);

        assert.equal(willRepost, false);
        assert.equal(state.bettingOpen, false);
        assert.equal(chipsOnTable(state), before);
    });
});

describe("once the hand is dealt", () => {
    test("the blinds are down, and re-aiming them moves real chips", () => {
        const state = makeTable({ seatCount: 6, seated: [0, 1, 2, 3], dealerSeatIndex: 0 });
        const before = chipsOnTable(state);
        Betting.beginHand(state);
        assert.equal(Betting.blindsArePosted(state), true);
        assert.equal(Betting.committed(state.seats[1]), 1);

        state.blindOverride = { sbIndex: 3, bbIndex: 0 };
        if (Betting.blindsArePosted(state)) Betting.repostBlinds(state);

        assert.equal(Betting.committed(state.seats[1]), 0, "the old small blind got their chip back");
        assert.equal(Betting.committed(state.seats[3]), 1);
        assert.equal(Betting.committed(state.seats[0]), 2);
        assert.equal(chipsOnTable(state), before, "no chips created or lost in the shuffle");
    });

    test("but not once somebody has answered them", () => {
        const state = makeTable({ seatCount: 4, seated: [0, 1, 2, 3], dealerSeatIndex: 0 });
        Betting.beginHand(state);
        Betting.call(state, state.actingSeatIndex);
        assert.equal(Betting.blindsArePosted(state), false, "there is a call to unpick now");
    });

    test("nor on a later street", () => {
        const state = makeTable({ seatCount: 4, seated: [0, 1, 2, 3], dealerSeatIndex: 0 });
        Betting.beginHand(state);
        state.street = "flop";
        assert.equal(Betting.blindsArePosted(state), false);
    });

    test("and a misdealt hand goes back to being a table in setup", () => {
        const state = makeTable({ seatCount: 4, seated: [0, 1, 2, 3], dealerSeatIndex: 0 });
        Betting.beginHand(state);
        Betting.takeHandBack(state);
        assert.equal(Betting.blindsArePosted(state), false, "nothing is posted until the dealer deals again");
    });

    test("as does a hand that has been paid out", () => {
        const state = makeTable({ seatCount: 4, seated: [0, 1, 2, 3], dealerSeatIndex: 0 });
        Betting.beginHand(state);
        Betting.sweepToHandTotals(state);
        HoldemState.startNextHand(state);
        assert.equal(Betting.blindsArePosted(state), false);
    });
});