import assert from "node:assert/strict";
import test from "node:test";
import { dateValue } from "../src/postgres-repository.js";

test("database date serialization preserves the local calendar date", () => {
  const previousTimezone = process.env.TZ;
  process.env.TZ = "Asia/Shanghai";

  try {
    const databaseDate = new Date(2026, 7, 10);

    assert.equal(databaseDate.toISOString().slice(0, 10), "2026-08-09");
    assert.equal(dateValue(databaseDate), "2026-08-10");
    assert.equal(dateValue("2026-08-10"), "2026-08-10");
  } finally {
    if (previousTimezone === undefined) delete process.env.TZ;
    else process.env.TZ = previousTimezone;
  }
});