core-js/tests/unit-pure/esnext.reflect.define-metadata.js

import defineMetadata from 'core-js-pure/full/reflect/define-metadata';

QUnit.test('Reflect.defineMetadata', assert => {
  assert.isFunction(defineMetadata);
  assert.arity(defineMetadata, 3);
  assert.name(defineMetadata, 'defineMetadata');
  assert.throws(() => defineMetadata('key', 'value', undefined, undefined), TypeError);
  assert.same(defineMetadata('key', 'value', {}, undefined), undefined);
  assert.same(defineMetadata('key', 'value', {}, 'name'), undefined);
});