core-js/tests/unit-global/es.number.parse-int.js

import { GLOBAL, WHITESPACES } from '../helpers/constants.js';

QUnit.test('Number.parseInt', assert => {
  const { parseInt } = Number;
  assert.isFunction(parseInt);
  assert.name(parseInt, 'parseInt');
  assert.arity(parseInt, 2);
  assert.looksNative(parseInt);
  assert.nonEnumerable(Number, 'parseInt');
  assert.same(parseInt, GLOBAL.parseInt);
  for (let radix = 2; radix <= 36; ++radix) {
    assert.same(parseInt('10', radix), radix, `radix ${ radix }`);
  }
  const strings = ['01', '08', '10', '42'];
  for (const string of strings) {
    assert.same(parseInt(string), parseInt(string, 10), `default radix is 10: ${ string }`);
  }
  assert.same(parseInt('0x16'), parseInt('0x16', 16), 'default radix is 16: 0x16');
  assert.same(parseInt('  0x16'), parseInt('0x16', 16), 'ignores leading whitespace #1');
  assert.same(parseInt('  42'), parseInt('42', 10), 'ignores leading whitespace #2');
  assert.same(parseInt('  08'), parseInt('08', 10), 'ignores leading whitespace #3');
  assert.same(parseInt(`${ WHITESPACES }08`), parseInt('08', 10), 'ignores leading whitespace #4');
  assert.same(parseInt(`${ WHITESPACES }0x16`), parseInt('0x16', 16), 'ignores leading whitespace #5');
  const fakeZero = {
    valueOf() {
      return 0;
    },
  };
  assert.same(parseInt('08', fakeZero), parseInt('08', 10), 'valueOf #1');
  assert.same(parseInt('0x16', fakeZero), parseInt('0x16', 16), 'valueOf #2');
  assert.same(parseInt('-0xF'), -15, 'signed hex #1');
  assert.same(parseInt('-0xF', 16), -15, 'signed hex #2');
  assert.same(parseInt('+0xF'), 15, 'signed hex #3');
  assert.same(parseInt('+0xF', 16), 15, 'signed hex #4');
  assert.same(parseInt('10', -4294967294), 2, 'radix uses ToUint32');
  assert.same(parseInt(null), NaN);
  assert.same(parseInt(undefined), NaN);

  if (typeof Symbol == 'function' && !Symbol.sham) {
    const symbol = Symbol('Number.parseInt test');
    assert.throws(() => parseInt(symbol), 'throws on symbol argument');
    assert.throws(() => parseInt(Object(symbol)), 'throws on boxed symbol argument');
  }
});