decision-maker-2000/tests/hand-validation.test.ts

import assert from "node:assert/strict";
import test from "node:test";
import { chooseWinner, clampUnit, normalizeProbabilities, normalizeText, normalizeUniqueTextList } from "../src/domain/hand-validation.ts";

test("normalizeText trims and collapses whitespace", () => {
    assert.equal(normalizeText("  Friday\n  dinner  ", 20), "Friday dinner");
    assert.equal(normalizeText("   ", 20), null);
    assert.equal(normalizeText("too long", 3), null);
});

test("normalizeUniqueTextList rejects duplicates and invalid bounds", () => {
    assert.deepEqual(normalizeUniqueTextList([" Thai ", "Pizza"], 4, 20), ["Thai", "Pizza"]);
    assert.equal(normalizeUniqueTextList(["Thai", "thai"], 4, 20), null);
    assert.equal(normalizeUniqueTextList(["a", "b", "c"], 2, 20), null);
    assert.equal(normalizeUniqueTextList(["valid", 2], 4, 20), null);
});

test("normalizeProbabilities accepts weights and normalizes only live options", () => {
    assert.deepEqual(normalizeProbabilities({ a: 20, b: 30, stale: 50 }, ["a", "b"]), { a: 0.4, b: 0.6 });
});

test("normalizeProbabilities rejects malformed or unusable weights", () => {
    assert.equal(normalizeProbabilities({ a: 1, b: -1 }, ["a", "b"]), null);
    assert.equal(normalizeProbabilities({ a: 0, b: 0 }, ["a", "b"]), null);
    assert.equal(normalizeProbabilities({ a: 1 }, ["a", "b"]), null);
    assert.equal(normalizeProbabilities({ a: Number.NaN, b: 1 }, ["a", "b"]), null);
});

test("clampUnit makes Jev scalar metadata safe", () => {
    assert.equal(clampUnit(-1), 0);
    assert.equal(clampUnit(0.45), 0.45);
    assert.equal(clampUnit(3), 1);
    assert.equal(clampUnit("0.5"), 0);
});

test("one-tap winner confirms the highest weight with option-order tie breaking", () => {
    assert.equal(chooseWinner(["first", "second"], { first: 0.2, second: 0.8 }, 123, true), "second");
    assert.equal(chooseWinner(["first", "second"], { first: 0.5, second: 0.5 }, 123, true), "first");
});

test("seeded weighted winner is replayable", () => {
    const weights = { first: 0.2, second: 0.8 };
    assert.equal(chooseWinner(["first", "second"], weights, 42), chooseWinner(["first", "second"], weights, 42));
});