core-js/tests/unit-pure/es.string.blink.js

import blink from 'core-js-pure/es/string/blink';

QUnit.test('String#blink', assert => {
  assert.isFunction(blink);
  assert.same(blink('a'), '<blink>a</blink>', 'lower case');

  /* eslint-disable es/no-symbol -- safe */
  if (typeof Symbol == 'function') {
    assert.throws(() => blink(Symbol('blink test')), 'throws on symbol context');
  }
});