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core2026/packages/logic/test/neutralAuctionLegacyParity.test.ts
T

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TypeScript

import { spawnSync } from 'node:child_process';
import { fileURLToPath } from 'node:url';
import { describe, expect, it } from 'vitest';
import {
buildNeutralResourceAuctionPlan,
type NeutralAuctionPlanInput,
type NeutralResourceAuctionPlan,
} from '../src/auction/neutral.js';
const refRoot = process.env.SAMMO_REF_ROOT;
const oraclePath = fileURLToPath(new URL('../../../tools/legacy-oracles/neutral-auction.php', import.meta.url));
const runLegacyOracle = (input: NeutralAuctionPlanInput): NeutralResourceAuctionPlan[] => {
if (!refRoot) {
throw new Error('SAMMO_REF_ROOT is required');
}
const result = spawnSync('php', [oraclePath, refRoot, JSON.stringify(input)], {
encoding: 'utf8',
});
if (result.status !== 0) {
throw new Error(result.stderr || `legacy oracle exited with ${result.status}`);
}
return JSON.parse(result.stdout) as NeutralResourceAuctionPlan[];
};
const fixtures: Array<{ input: NeutralAuctionPlanInput; expectedTypes: string[] }> = [
{
expectedTypes: ['BUY_RICE'],
input: {
hiddenSeed: 'merchant-11',
seedYear: 180,
seedMonth: 1,
nationCount: 3,
consumeTournamentRoll: false,
averageGold: 5_432,
averageRice: 7_654,
buyRiceAuctionCount: 0,
sellRiceAuctionCount: 0,
},
},
{
expectedTypes: ['BUY_RICE', 'SELL_RICE'],
input: {
hiddenSeed: 'tournament-35',
seedYear: 191,
seedMonth: 12,
nationCount: 8,
consumeTournamentRoll: true,
averageGold: 25_000,
averageRice: 500,
buyRiceAuctionCount: 2,
sellRiceAuctionCount: 4,
},
},
{
expectedTypes: [],
input: {
hiddenSeed: 'merchant-32',
seedYear: 203,
seedMonth: 7,
nationCount: 3,
consumeTournamentRoll: false,
averageGold: 5_432,
averageRice: 7_654,
buyRiceAuctionCount: 0,
sellRiceAuctionCount: 0,
},
},
];
describe.skipIf(!refRoot)('neutral auction legacy PHP differential', () => {
for (const [index, fixture] of fixtures.entries()) {
it(`matches legacy RNG timing and amounts for fixture ${index + 1}`, () => {
const actual = buildNeutralResourceAuctionPlan(fixture.input);
expect(actual).toEqual(runLegacyOracle(fixture.input));
expect(actual.map((plan) => plan.auctionType)).toEqual(fixture.expectedTypes);
});
}
it('matches a seed, month, count, tournament, and average-resource matrix', () => {
let generatedAuctions = 0;
const generatedTypes = new Set<string>();
for (let index = 0; index < 96; index += 1) {
const input: NeutralAuctionPlanInput = {
hiddenSeed: `neutral-matrix-${index}`,
seedYear: 180 + (index % 17),
seedMonth: (index % 12) + 1,
nationCount: index % 11,
consumeTournamentRoll: index % 2 === 0,
averageGold: 500 + ((index * 1_337) % 25_000),
averageRice: 500 + ((index * 2_111) % 25_000),
buyRiceAuctionCount: index % 9,
sellRiceAuctionCount: index % 13,
};
const actual = buildNeutralResourceAuctionPlan(input);
expect(actual, `matrix fixture ${index}`).toEqual(runLegacyOracle(input));
generatedAuctions += actual.length;
for (const plan of actual) {
generatedTypes.add(plan.auctionType);
}
}
expect(generatedAuctions).toBeGreaterThan(0);
expect(generatedTypes).toEqual(new Set(['BUY_RICE', 'SELL_RICE']));
});
});