fix test 37 passing

    it('should return a Promise', () => {

      const result = delay(100);

      assert.strictEqual(typeof result.then, 'function');

      assert.ok(

        result instanceof Promise,

        'Result is not a native Promise instance',

      );

    });

    it('should resolve after the specified delay', async () => {

      const start = Date.now();

    it('should not resolve before the specified delay and then resolve after', async () => {

      const promise = delay(200);

      clock.tick(200);

      let settled = false;

      promise.then(() => {

        settled = true;

      });

      // Advance almost all the time but not complete

      clock.tick(199);

      // Flush microtasks

      await Promise.resolve();

      assert.strictEqual(settled, false, 'Promise resolved too early');

      // Complete remaining time

      clock.tick(1);

      await promise;

      const elapsed = Date.now() - start;

      assert(elapsed >= 200, `Elapsed: ${elapsed}`);

      assert.strictEqual(

        settled,

        true,

        'Promise did not resolve after full delay',

      );

    });

    it('should resolve with undefined', async () => {

    });

    it('should work with zero delay', async () => {

      const start = Date.now();

      const promise = delay(0);

      let settled = false;

      promise.then(() => {

        settled = true;

      });

      clock.tick(0);

      await promise;

      const elapsed = Date.now() - start;

      assert(elapsed < 50, `Elapsed: ${elapsed}`);

      assert.strictEqual(

        settled,

        true,

        'Promise should resolve immediately for 0 delay',

      );

    });

    it('should accept then', (done) => {