test/index.test.js

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file This file contains a suite of tests for the sum function, covering various scenarios including positive numbers, a mix of negative and positive numbers, an empty array input, and handling large datasets.

import { test } from "node:test";
import assert from "node:assert/strict";
import { sum } from "../index.js";

test("sum with positive numbers", () => {
  assert.strictEqual(sum(1, 2, 3), 6);
});

test("sum with negative and positive numbers", () => {
  assert.strictEqual(sum(-1, 1, -2, 2), 0);
});

test("sum of empty array", () => {
  assert.strictEqual(sum(), 0);
});

test("sum of large dataset", () => {
  const largeDataset = Array.from({ length: 1000 }, (_, i) => i + 1);
  assert.strictEqual(sum(...largeDataset), (1000 * 1001) / 2);
});