test/gcd.test.js

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file Add gcd function and export it with comprehensive tests

import { test } from "node:test";
import assert from "node:assert/strict";
import { gcd } from "../src/gcd.js";

test("gcd basic cases", () => {
  assert.strictEqual(gcd(48, 18), 6);
  assert.strictEqual(gcd(18, 48), 6);
});

test("gcd with zero", () => {
  assert.strictEqual(gcd(0, 5), 5);
  assert.strictEqual(gcd(5, 0), 5);
  assert.strictEqual(gcd(0, 0), 0);
});

test("gcd with negative numbers", () => {
  assert.strictEqual(gcd(-48, 18), 6);
  assert.strictEqual(gcd(48, -18), 6);
  assert.strictEqual(gcd(-48, -18), 6);
});

test("gcd with equal numbers", () => {
  assert.strictEqual(gcd(13, 13), 13);
});