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

// Values a dealer can actually produce with a typo, and the ones a corrupted save
// can produce on its own. None of these should be able to move chips.
const { test, describe } = require("node:test");
const assert = require("node:assert/strict");
const { Betting, HoldemState, makeTable, chipsOnTable } = require("./load");

describe("a stack can never go negative", () => {
    test("a mistyped negative stack reads as empty, not as owing chips", () => {
        const state = makeTable({ seatCount: 4, seated: [0, 1, 2] });
        state.seats[0].stack = -50;
        assert.equal(Betting.stackOf(state, state.seats[0]), 0);
    });

    test("a negative stack can't be bet with", () => {
        const state = makeTable({ seatCount: 4, seated: [0, 1, 2] });
        state.seats[0].stack = -50;
        const before = state.seats.reduce((s, p) => s + Math.max(0, Number(p.stack) || 0), 0);

        const moved = Betting.putIn(state, 0, 25);

        assert.equal(moved, 0, "nothing moves out of an empty stack");
        assert.ok(Betting.stackOf(state, state.seats[0]) >= 0);
        assert.equal(state.seats[0].committed, 0, "and nothing appears in front of them");
        assert.ok(state.seats.reduce((s, p) => s + Math.max(0, Number(p.stack) || 0), 0) <= before);
    });

    test("a negative table default doesn't hand everyone a negative stack", () => {
        const state = makeTable({ seatCount: 4, seated: [0, 1, 2] });
        state.seats.forEach(p => { p.stack = null; });
        state.defaultStack = -100;
        state.seats.forEach(p => assert.equal(Betting.stackOf(state, p), 0));
    });

    test("a negative stack doesn't make a player look like they can still bet", () => {
        const state = makeTable({ seatCount: 4, seated: [0, 1, 2] });
        state.seats[0].stack = -50;
        assert.ok(!Betting.seatsWithChips(state).some(s => s.index === 0));
    });
});

describe("blinds that can't be posted", () => {
    test("negative blinds post nothing rather than paying players to sit down", () => {
        const state = makeTable({ seatCount: 4, seated: [0, 1, 2] });
        state.smallBlind = -5;
        state.bigBlind = -10;
        const before = chipsOnTable(state);

        Betting.beginHand(state);

        state.seats.forEach(p => assert.equal(p.committed, 0));
        assert.equal(chipsOnTable(state), before);
    });

    test("an unreadable blind doesn't wedge the hand", () => {
        const state = makeTable({ seatCount: 4, seated: [0, 1, 2] });
        state.bigBlind = NaN;
        state.smallBlind = 1;

        Betting.beginHand(state);

        assert.ok(Number.isFinite(state.currentBet), "the bet to match is still a number");
        assert.ok(!Number.isNaN(Betting.potSoFar(state)));
    });

    test("blinds nobody can cover put those players all-in and move on", () => {
        const state = makeTable({ seatCount: 4, seated: [0, 1, 2], stack: 10 });
        state.smallBlind = 500;
        state.bigBlind = 1000;
        const before = chipsOnTable(state);

        Betting.beginHand(state);

        assert.equal(chipsOnTable(state), before, "no chips invented covering a blind");
        state.seats.forEach(p => assert.ok((Number(p.stack) || 0) >= 0));
        assert.ok(state.actingSeatIndex === null || state.seats[state.actingSeatIndex].inHand);
    });
});

describe("a saved table that comes back damaged", () => {
    test("unreadable storage falls back to a fresh table", () => {
        // load() has to survive whatever is in localStorage, because the alternative
        // is a dealer opening the tool mid-session to a blank screen.
        const original = globalThis.localStorage;
        globalThis.localStorage = {
            getItem: () => "{not json at all",
            setItem: () => {},
            removeItem: () => {},
        };
        const state = HoldemState.load();
        globalThis.localStorage = original;

        assert.equal(state.seats.length, HoldemState.DEFAULT_SEAT_COUNT);
        assert.equal(state.handNumber, 1);
    });

    test("a save missing its seats is treated as no save at all", () => {
        const original = globalThis.localStorage;
        globalThis.localStorage = {
            getItem: () => JSON.stringify({ handNumber: 7, smallBlind: 3 }),
            setItem: () => {},
            removeItem: () => {},
        };
        const state = HoldemState.load();
        globalThis.localStorage = original;

        assert.ok(Array.isArray(state.seats) && state.seats.length > 0);
    });

    test("a save from before a field existed gets the field, not undefined", () => {
        const original = globalThis.localStorage;
        globalThis.localStorage = {
            getItem: () => JSON.stringify({
                seats: [{ id: "a", name: "Ann", inHand: true }, { id: "b", name: "Ben", inHand: true }],
                handNumber: 4,
            }),
            setItem: () => {},
            removeItem: () => {},
        };
        const state = HoldemState.load();
        globalThis.localStorage = original;

        assert.equal(state.blindOverride, null);
        assert.equal(state.street, "preflop");
        state.seats.forEach(p => {
            assert.equal(p.committed, 0);
            assert.equal(p.hasActed, false);
            assert.equal(p.buyIns, 0);
        });
        // And it has to be playable, not just parseable.
        assert.doesNotThrow(() => Betting.beginHand(state));
    });

    test("storage that refuses to be written doesn't take the table down", () => {
        const original = globalThis.localStorage;
        globalThis.localStorage = {
            getItem: () => null,
            setItem: () => { throw new Error("QuotaExceededError"); },
            removeItem: () => {},
        };
        const state = HoldemState.createDefault();
        assert.doesNotThrow(() => HoldemState.save(state), "a full disk must not break the hand in progress");
        globalThis.localStorage = original;
    });
});