core-js/tests/unit-pure/es.math.f16round.js

// some asserts based on https://github.com/petamoriken/float16/blob/master/test/f16round.js
import { createConversionChecker } from '../helpers/helpers.js';

import f16round from 'core-js-pure/es/math/f16round';

const { MAX_VALUE, MIN_VALUE } = Number;

QUnit.test('Math.f16round', assert => {
  assert.isFunction(f16round);
  assert.name(f16round, 'f16round');
  assert.arity(f16round, 1);
  assert.same(f16round(), NaN);
  assert.same(f16round(undefined), NaN);
  assert.same(f16round(NaN), NaN);
  assert.same(f16round(null), 0);
  assert.same(f16round(0), 0);
  assert.same(f16round(-0), -0);
  assert.same(f16round(MIN_VALUE), 0);
  assert.same(f16round(-MIN_VALUE), -0);
  assert.same(f16round(Infinity), Infinity);
  assert.same(f16round(-Infinity), -Infinity);
  assert.same(f16round(MAX_VALUE), Infinity);
  assert.same(f16round(-MAX_VALUE), -Infinity);

  const MAX_FLOAT16 = 65504;
  const MIN_FLOAT16 = 2 ** -24;

  assert.same(f16round(MAX_FLOAT16), MAX_FLOAT16);
  assert.same(f16round(-MAX_FLOAT16), -MAX_FLOAT16);
  assert.same(f16round(MIN_FLOAT16), MIN_FLOAT16);
  assert.same(f16round(-MIN_FLOAT16), -MIN_FLOAT16);
  assert.same(f16round(MIN_FLOAT16 / 2), 0);
  assert.same(f16round(-MIN_FLOAT16 / 2), -0);
  assert.same(f16round(2.980232238769531911744490042422139897126953655970282852649688720703125e-8), MIN_FLOAT16);
  assert.same(f16round(-2.980232238769531911744490042422139897126953655970282852649688720703125e-8), -MIN_FLOAT16);

  assert.same(f16round(1.337), 1.3369140625);
  assert.same(f16round(0.499994), 0.5);
  assert.same(f16round(7.9999999), 8);

  const checker = createConversionChecker(1.1);
  assert.same(f16round(checker), 1.099609375, 'object wrapper');
  assert.same(checker.$valueOf, 1, 'valueOf calls');
  assert.same(checker.$toString, 0, 'toString calls');
});