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

const { test, describe } = require("node:test");
const assert = require("node:assert/strict");
const { HoldemState, makeTable } = require("./load");

describe("HoldemState.advanceButton", () => {
    test("the button moves to the next player, not the next empty chair", () => {
        // Four players spread around a ten-seat table: 0, 3, 4, 8.
        const state = makeTable({ seatCount: 10, seated: [0, 3, 4, 8], dealerSeatIndex: 0 });
        HoldemState.advanceButton(state);
        assert.equal(state.dealerSeatIndex, 3, "skips the three empty chairs between");
        HoldemState.advanceButton(state);
        assert.equal(state.dealerSeatIndex, 4);
        HoldemState.advanceButton(state);
        assert.equal(state.dealerSeatIndex, 8);
        HoldemState.advanceButton(state);
        assert.equal(state.dealerSeatIndex, 0, "wraps back round to the first player");
    });

    test("every player gets the button once per orbit", () => {
        const seated = [1, 2, 6, 7, 9];
        const state = makeTable({ seatCount: 12, seated, dealerSeatIndex: 1 });
        const visited = [];
        for (let i = 0; i < seated.length; i++) {
            visited.push(state.dealerSeatIndex);
            HoldemState.advanceButton(state);
        }
        assert.deepEqual(visited.slice().sort((a, b) => a - b), seated);
    });

    test("it still moves when nobody is dealt in, rather than looking stuck", () => {
        const state = makeTable({ seatCount: 6, seated: [], dealerSeatIndex: 2 });
        HoldemState.advanceButton(state);
        assert.equal(state.dealerSeatIndex, 3);
    });

    test("counterclockwise play runs the button the other way", () => {
        const state = makeTable({ seatCount: 6, seated: [0, 2, 4], dealerSeatIndex: 4 });
        state.direction = "counterclockwise";
        HoldemState.advanceButton(state);
        assert.equal(state.dealerSeatIndex, 2);
    });
});

describe("HoldemState.getBlindSeats", () => {
    test("blinds follow the players, not the chairs left of the button", () => {
        // Seats 1 and 2 are empty, so the blinds belong on 3 and 7.
        const state = makeTable({ seatCount: 9, seated: [0, 3, 7], dealerSeatIndex: 0 });
        const { sbIndex, bbIndex, headsUp } = HoldemState.getBlindSeats(state);
        assert.equal(headsUp, false);
        assert.equal(sbIndex, 3);
        assert.equal(bbIndex, 7);
    });

    test("heads-up, the button posts the small blind", () => {
        const state = makeTable({ seatCount: 6, seated: [2, 5], dealerSeatIndex: 2 });
        const { sbIndex, bbIndex, headsUp } = HoldemState.getBlindSeats(state);
        assert.equal(headsUp, true);
        assert.equal(sbIndex, 2, "the button is the small blind heads-up");
        assert.equal(bbIndex, 5);
    });

    test("heads-up with the button on an empty chair still posts both blinds", () => {
        const state = makeTable({ seatCount: 6, seated: [1, 4], dealerSeatIndex: 0 });
        const { sbIndex, bbIndex, headsUp } = HoldemState.getBlindSeats(state);
        assert.equal(headsUp, true);
        assert.equal(sbIndex, 1);
        assert.equal(bbIndex, 4);
        assert.notEqual(sbIndex, bbIndex, "two blinds never land on one player");
    });

    test("fewer than two players means no blinds to post", () => {
        const state = makeTable({ seatCount: 6, seated: [3], dealerSeatIndex: 0 });
        const { sbIndex, bbIndex } = HoldemState.getBlindSeats(state);
        assert.equal(sbIndex, null);
        assert.equal(bbIndex, null);
    });
});

describe("HoldemState.sessionStandings", () => {
    test("a player's cash position counts chips in front plus chips in the pot", () => {
        const state = makeTable({ seatCount: 3, seated: [0, 1, 2], stack: 0 });
        const [a] = state.seats;
        a.buyIns = 100;
        a.stack = 60;
        a.amountOverride = 25; // banked into the hand in progress
        a.committed = 15;      // still in front of them on this street

        HoldemState.recordHand(state, [{ id: a.id, label: "P1", amount: 0 }]);
        const standings = HoldemState.sessionStandings(state);
        const row = standings.find(s => s.id === a.id);

        // 60 in front + 40 in the pot - 100 bought in = level.
        assert.equal(row.cashPosition, 0, "money in the pot is still theirs until it's won");
        assert.equal(row.boughtIn, 100);
        assert.equal(row.chipsNow, 60);
    });

    test("hand results accumulate across the session", () => {
        const state = makeTable({ seatCount: 2, seated: [0, 1], stack: 0 });
        const [a, b] = state.seats;
        a.amountOverride = 10;
        b.amountOverride = 10;
        HoldemState.recordHand(state, [{ id: a.id, label: "P1", amount: 20 }]);

        a.amountOverride = 5;
        b.amountOverride = 5;
        HoldemState.recordHand(state, [{ id: b.id, label: "P2", amount: 10 }]);

        const standings = HoldemState.sessionStandings(state);
        assert.equal(standings.find(s => s.id === a.id).net, 5);
        assert.equal(standings.find(s => s.id === b.id).net, -5);
        assert.equal(state.handNumber, 3, "the counter moved on twice");
    });

    test("the history is capped so a long session can still be saved", () => {
        const state = makeTable({ seatCount: 2, seated: [0, 1], stack: 0 });
        for (let i = 0; i < HoldemState.MAX_HISTORY_ENTRIES + 25; i++) {
            HoldemState.recordHand(state, [{ id: state.seats[0].id, label: "P1", amount: 1 }]);
        }
        assert.equal(state.handHistory.length, HoldemState.MAX_HISTORY_ENTRIES);
        assert.equal(state.handHistory[0].handNumber, HoldemState.MAX_HISTORY_ENTRIES + 25, "newest first");
    });
});

describe("HoldemState.resizeSeats", () => {
    test("the table is clamped to a size a dealer could actually run", () => {
        const state = makeTable({ seatCount: 6 });
        HoldemState.resizeSeats(state, 100);
        assert.equal(state.seatCount, 24);
        HoldemState.resizeSeats(state, 1);
        assert.equal(state.seatCount, 2);
    });

    test("an unreadable seat count falls back to a standard table", () => {
        // Empty or non-numeric input (and zero, which is equally meaningless)
        // lands on the default rather than a two-seat table.
        const state = makeTable({ seatCount: 6 });
        HoldemState.resizeSeats(state, NaN);
        assert.equal(state.seatCount, HoldemState.DEFAULT_SEAT_COUNT);
    });

    test("shrinking past the button brings it back onto the table", () => {
        const state = makeTable({ seatCount: 9, dealerSeatIndex: 8 });
        HoldemState.resizeSeats(state, 4);
        assert.ok(state.dealerSeatIndex < 4);
    });
});