import assert from 'assert';

function add(a: number, b: number): number {
  return a + b;
}

assert.strictEqual(add(1, 2), 3, 'add(1, 2) should be 3');
assert.strictEqual(add(0, 0), 0, 'add(0, 0) should be 0');
assert.strictEqual(add(-1, 1), 0, 'add(-1, 1) should be 0');

console.log('All tests passed!');