core-js/tests/unit-global/es.regexp.to-string.js

/* eslint-disable prefer-regex-literals, regexp/sort-flags, regexp/no-useless-flag -- required for testing */
import { STRICT } from '../helpers/constants.js';

QUnit.test('RegExp#toString', assert => {
  const { toString } = RegExp.prototype;
  assert.isFunction(toString);
  assert.arity(toString, 0);
  assert.name(toString, 'toString');
  assert.looksNative(toString);
  assert.nonEnumerable(RegExp.prototype, 'toString');
  assert.same(String(/pattern/), '/pattern/');
  assert.same(String(/pattern/i), '/pattern/i');
  assert.same(String(/pattern/mi), '/pattern/im');
  assert.same(String(/pattern/im), '/pattern/im');
  assert.same(String(/pattern/mgi), '/pattern/gim');
  assert.same(String(new RegExp('pattern')), '/pattern/');
  assert.same(String(new RegExp('pattern', 'i')), '/pattern/i');
  assert.same(String(new RegExp('pattern', 'mi')), '/pattern/im');
  assert.same(String(new RegExp('pattern', 'im')), '/pattern/im');
  assert.same(String(new RegExp('pattern', 'mgi')), '/pattern/gim');
  assert.same(toString.call({
    source: 'foo',
    flags: 'bar',
  }), '/foo/bar');
  assert.same(toString.call({}), '/undefined/undefined');
  if (STRICT) {
    assert.throws(() => toString.call(7));
    assert.throws(() => toString.call('a'));
    assert.throws(() => toString.call(false));
    assert.throws(() => toString.call(null));
    assert.throws(() => toString.call(undefined));
  }

  assert.throws(() => toString.call({
    source: Symbol('RegExp#toString test'),
    flags: 'g',
  }), 'throws on symbol');
});