How to create a large ArrayBuffer for testing?

A "RangeError: Maximum call stack size exceeded" error occurred when large array was passed in String.fromCharCode.apply. So I am trying to modify the code as follows. How do I create a large ArrayBuffer to test a modified function?

Original code:

function ab2str(buf) {
  return String.fromCharCode.apply(null, new Uint8Array(buf));
}

Modified code:

function ab2str(buf) {
  let str = '';
  new Uint8Array(ab).forEach((data) => {
    str += String.fromCharCode(data);
  });
  return str;
}

Test code:

let data;
beforeAll(() => {
  data = createLargeArrayBuffer();
});

test('ab2str', () => {
  const str = ab2str(data);
  const result = str2ab(data);
  expect(result).toStictEqual(data);
});