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

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

describe("Money.format", () => {
    test("whole amounts drop the pointless cents", () => {
        assert.equal(Money.format(12), "$12");
        assert.equal(Money.format(450), "$450");
        assert.equal(Money.format(1250000), "$1,250,000");
        assert.equal(Money.format(0), "$0");
    });

    test("amounts that carry cents still show them", () => {
        assert.equal(Money.format(12.5), "$12.50");
        assert.equal(Money.format(0.25), "$0.25");
        assert.equal(Money.format(3.01), "$3.01");
    });

    test("a quarter-blind game reads exactly as it did", () => {
        // The case that would be ruined by dropping cents unconditionally.
        [0.25, 0.5, 1.75, 12.05].forEach(v => {
            assert.match(Money.format(v), /\.\d\d$/, `${v} lost its cents`);
        });
    });

    test("floating-point dust doesn't invent cents", () => {
        assert.equal(Money.format(0.1 + 0.2), "$0.30");
        assert.equal(Money.format(1.0000000001), "$1");
    });

    test("signed amounts put the sign out front, both scales", () => {
        assert.equal(Money.formatSigned(87500), "+$87,500");
        assert.equal(Money.formatSigned(-87500), "-$87,500");
        assert.equal(Money.formatSigned(-12.5), "-$12.50");
        assert.equal(Money.formatSigned(0), "$0");
    });

    test("rubbish in doesn't produce rubbish out", () => {
        assert.equal(Money.format(null), "$0");
        assert.equal(Money.format(undefined), "$0");
        assert.equal(Money.format("nonsense"), "$0");
    });
});

describe("Money.forSheet", () => {
    test("a bare number a spreadsheet will add up", () => {
        assert.equal(Money.forSheet(1250000), "1250000.00");
        assert.equal(Money.forSheet(12.5), "12.50");
        assert.equal(Money.forSheet(-87500), "-87500.00");
    });

    test("no currency symbol and no thousands separators", () => {
        const written = Money.forSheet(1234567.89);
        assert.ok(!written.includes("$"), "a $ makes the cell text");
        assert.ok(!written.includes(","), "a comma makes the cell text");
        assert.equal(Number(written), 1234567.89, "and it parses straight back to a number");
    });
});

describe("the exported CSV", () => {
    const history = [
        { handNumber: 2, timestamp: 0, pot: 1250000, payouts: [{ id: "a", label: "Alexandra", amount: 1250000 }] },
        { handNumber: 1, timestamp: 0, pot: 24.5, payouts: [{ id: "b", label: "Bob", amount: 24.5 }] },
    ];
    const standings = [
        { id: "a", name: "Alexandra", in: 1250000, won: 1250000, net: 0, boughtIn: 3200000, chipsNow: 3200000, cashPosition: 0 },
        { id: "b", name: "Bob", in: 24.5, won: 0, net: -24.5, boughtIn: 100, chipsNow: 75.5, cashPosition: -24.5 },
    ];

    // Splitting on commas isn't good enough: the timestamp column legitimately holds
    // one ("1/1/1970, 5:00:00 PM") and is quoted for exactly that reason.
    const splitRow = line => {
        const fields = [];
        let field = "";
        let quoted = false;
        for (let i = 0; i < line.length; i++) {
            const c = line[i];
            if (quoted) {
                if (c === '"' && line[i + 1] === '"') { field += '"'; i++; }
                else if (c === '"') quoted = false;
                else field += c;
            } else if (c === '"') quoted = true;
            else if (c === ",") { fields.push(field); field = ""; }
            else field += c;
        }
        fields.push(field);
        return fields;
    };

    test("every money cell parses as a number", () => {
        const csv = HandHistoryExport.toCsv(history, standings);
        const lines = csv.split("\r\n");

        lines.slice(1, 3).forEach(line => {
            const cell = splitRow(line)[2]; // Pot
            assert.ok(cell !== "" && !Number.isNaN(Number(cell)), `pot cell "${cell}" isn't a number`);
        });

        // Standings rows: every column after the name has to be numeric.
        const standingsStart = lines.findIndex(l => l.startsWith("Player,"));
        lines.slice(standingsStart + 1).filter(Boolean).forEach(line => {
            splitRow(line).slice(1).forEach(cell => {
                assert.ok(cell !== "" && !Number.isNaN(Number(cell)), `standings cell "${cell}" isn't a number`);
            });
        });
    });

    test("a million-dollar pot doesn't need quoting any more", () => {
        const csv = HandHistoryExport.toCsv(history, []);
        assert.ok(csv.includes("1250000.00"), "written plainly");
        assert.ok(!csv.includes('"$1,250,000'), "not as a quoted, unsummable string");
    });

    test("names and payout descriptions stay human", () => {
        const csv = HandHistoryExport.toCsv(history, standings);
        assert.ok(csv.includes("Alexandra"), "the name column is still a name");
        assert.ok(csv.includes("Alexandra: $1,250,000"), "the payout column still reads like a sentence");
    });

    test("a name with a comma is still quoted properly", () => {
        const csv = HandHistoryExport.toCsv([], [
            { id: "x", name: "Smith, John", in: 0, won: 0, net: 0, boughtIn: 0, chipsNow: 0, cashPosition: 0 },
        ]);
        assert.ok(csv.includes('"Smith, John"'), "the CSV escaping still applies where it's needed");
    });
});