es.number.constructor.js

import { WHITESPACES } from '../helpers/constants';
import { nativeSubclass } from '../helpers/helpers';

function getCheck(assert) {
  return function (a, b) {
    assert.same(Number(a), b, `Number ${ typeof a } ${ a } -> ${ b }`);
    const x = new Number(a);
    assert.same(x, Object(x), `new Number ${ typeof a } ${ a } is object`);
    assert.same({}.toString.call(x).slice(8, -1), 'Number', `classof new Number ${ typeof a } ${ a } is Number`);
    assert.same(x.valueOf(), b, `new Number(${ typeof a } ${ a }).valueOf() -> ${ b }`);
  };
}

QUnit.test('Number constructor: regression', assert => {
  const check = getCheck(assert);
  assert.isFunction(Number);
  assert.arity(Number, 1);
  assert.name(Number, 'Number');
  assert.looksNative(Number);
  assert.same(Number.prototype.constructor, Number);
  assert.same(1.0.constructor, Number);
  const constants = ['MAX_VALUE', 'MIN_VALUE', 'NaN', 'NEGATIVE_INFINITY', 'POSITIVE_INFINITY'];
  for (const constant of constants) {
    assert.true(constant in Number, `Number.${ constant }`);
    assert.nonEnumerable(Number, constant);
  }
  assert.same(Number(), 0);
  assert.same(new Number().valueOf(), 0);
  check(42, 42);
  check(42.42, 42.42);
  check(new Number(42), 42);
  check(new Number(42.42), 42.42);
  check('42', 42);
  check('42.42', 42.42);
  check('0x42', 66);
  check('0X42', 66);
  check('0xzzz', NaN);
  check('0x1g', NaN);
  check('+0x1', NaN);
  check('-0x1', NaN);
  check('+0X1', NaN);
  check('-0X1', NaN);
  check(new String('42'), 42);
  check(new String('42.42'), 42.42);
  check(new String('0x42'), 66);
  check(null, 0);
  check(undefined, NaN);
  check(false, 0);
  check(true, 1);
  check(new Boolean(false), 0);
  check(new Boolean(true), 1);
  check({}, NaN);
  check({
    valueOf: '1.1',
  }, NaN);
  check({
    valueOf: '1.1',
    toString() {
      return '2.2';
    },
  }, 2.2);
  check({
    valueOf() {
      return '1.1';
    },
  }, 1.1);
  check({
    valueOf() {
      return '1.1';
    },
    toString() {
      return '2.2';
    },
  }, 1.1);
  check({
    valueOf() {
      return '-0x1a2b3c';
    },
  }, NaN);
  check({
    toString() {
      return '-0x1a2b3c';
    },
  }, NaN);
  check({
    valueOf() {
      return 42;
    },
  }, 42);
  check({
    valueOf() {
      return '42';
    },
  }, 42);
  check({
    valueOf() {
      return null;
    },
  }, 0);
  check({
    toString() {
      return 42;
    },
  }, 42);
  check({
    toString() {
      return '42';
    },
  }, 42);
  check({
    valueOf() {
      return 1;
    },
    toString() {
      return 2;
    },
  }, 1);
  check({
    valueOf: 1,
    toString() {
      return 2;
    },
  }, 2);
  let number = 1;
  assert.same(Number({
    valueOf() {
      return ++number;
    },
  }), 2, 'Number call valueOf only once #1');
  assert.same(number, 2, 'Number call valueOf only once #2');
  number = 1;
  assert.same(Number({
    toString() {
      return ++number;
    },
  }), 2, 'Number call toString only once #1');
  assert.same(number, 2, 'Number call toString only once #2');
  number = 1;
  assert.same(new Number({
    valueOf() {
      return ++number;
    },
  }).valueOf(), 2, 'new Number call valueOf only once #1');
  assert.same(number, 2, 'new Number call valueOf only once #2');
  number = 1;
  assert.same(new Number({
    toString() {
      return ++number;
    },
  }).valueOf(), 2, 'new Number call toString only once #1');
  assert.same(number, 2, 'new Number call toString only once #2');
  assert.throws(() => Number(Object.create(null)), TypeError, 'Number assert.throws on object w/o valueOf and toString');
  assert.throws(() => Number({
    valueOf: 1,
    toString: 2,
  }), TypeError, 'Number assert.throws on object then valueOf and toString are not functions');
  assert.throws(() => new Number(Object.create(null)), TypeError, 'new Number assert.throws on object w/o valueOf and toString');
  assert.throws(() => new Number({
    valueOf: 1,
    toString: 2,
  }), TypeError, 'new Number assert.throws on object then valueOf and toString are not functions');

  if (typeof Symbol == 'function' && !Symbol.sham) {
    assert.throws(() => Number(Symbol()), 'throws on symbol argument');
    assert.throws(() => new Number(Symbol()), 'throws on symbol argument, new');
  }

  number = new Number(42);
  assert.same(typeof number.constructor(number), 'number');
  check(`${ WHITESPACES }42`, 42);
  check(`42${ WHITESPACES }`, 42);
  check(`${ WHITESPACES }42${ WHITESPACES }`, 42);
  check(`${ WHITESPACES }0x42`, 66);
  check(`0x42${ WHITESPACES }`, 66);
  check(`${ WHITESPACES }0x42${ WHITESPACES }`, 66);
  check(`${ WHITESPACES }0X42`, 66);
  check(`0X42${ WHITESPACES }`, 66);
  check(`${ WHITESPACES }0X42${ WHITESPACES }`, 66);
  if (nativeSubclass) {
    const Subclass = nativeSubclass(Number);
    assert.true(new Subclass() instanceof Subclass, 'correct subclassing with native classes #1');
    assert.true(new Subclass() instanceof Number, 'correct subclassing with native classes #2');
    assert.same(new Subclass(1).toFixed(2), '1.00', 'correct subclassing with native classes #3');
  }
});

QUnit.test('Number constructor: binary', assert => {
  const check = getCheck(assert);
  check('0b1', 1);
  check('0B1', 1);
  check('0b12', NaN);
  check('0b234', NaN);
  check('0b1!', NaN);
  check('+0b1', NaN);
  check('-0b1', NaN);
  check(' 0b1', 1);
  check('0b1\n', 1);
  check('\n 0b1\n ', 1);
  check(' 0B1', 1);
  check('0B1\n', 1);
  check('\n 0B1\n ', 1);
  check({
    valueOf() {
      return '0b11';
    },
  }, 3);
  check({
    toString() {
      return '0b111';
    },
  }, 7);
  check({
    valueOf() {
      return '0b101010';
    },
  }, 42);
  check({
    toString() {
      return '0b101010';
    },
  }, 42);
  check(`${ WHITESPACES }0b11`, 3);
  check(`0b11${ WHITESPACES }`, 3);
  check(`${ WHITESPACES }0b11${ WHITESPACES }`, 3);
  check(`${ WHITESPACES }0B11`, 3);
  check(`0B11${ WHITESPACES }`, 3);
  check(`${ WHITESPACES }0B11${ WHITESPACES }`, 3);
});

QUnit.test('Number constructor: octal', assert => {
  const check = getCheck(assert);
  check('0o7', 7);
  check('0O7', 7);
  check('0o18', NaN);
  check('0o89a', NaN);
  check('0o1!', NaN);
  check('+0o1', NaN);
  check('-0o1', NaN);
  check(' 0o1', 1);
  check('0o1\n', 1);
  check('\n 0o1\n ', 1);
  check(' 0O1', 1);
  check('0O1\n', 1);
  check('\n 0O1\n ', 1);
  check({
    valueOf() {
      return '0o77';
    },
  }, 63);
  check({
    toString() {
      return '0o777';
    },
  }, 511);
  check({
    valueOf() {
      return '0o12345';
    },
  }, 5349);
  check({
    toString() {
      return '0o12345';
    },
  }, 5349);
  check(`${ WHITESPACES }0o11`, 9);
  check(`0o11${ WHITESPACES }`, 9);
  check(`${ WHITESPACES }0o11${ WHITESPACES }`, 9);
  check(`${ WHITESPACES }0O11`, 9);
  check(`0O11${ WHITESPACES }`, 9);
  check(`${ WHITESPACES }0O11${ WHITESPACES }`, 9);
});