test: improve esm tests

src/index.test.mjs

@@ -4,14 +4,33 @@ import { it } from 'node:test';
 
 import assert from 'assert';
 
-import { createElement, Image, jsx, render, Video } from '../cjs/index.js';
+import {
+  createElement,
+  createRef,
+  Image,
+  jsx,
+  render,
+  Video,
+} from '../cjs/index.js';
 
 [createElement, Image, render, Video].forEach((func) => {
   it(`exports ${func.name}`, () => {
     assert.strictEqual(typeof func, 'function');
   });
 });
 
+it('exports createElement', () => {
+  assert.deepEqual(createElement(Image, { x: 42 }), {
+    key: null,
+    props: { x: 42 },
+    type: Image,
+  });
+});
+
+it('exports createRef', () => {
+  assert.deepEqual(createRef(), { current: null });
+});
+
 it('exports jsx', () => {
   assert.strictEqual(jsx, createElement);
 });

src/render/gameobject.test.tsx

@@ -1,7 +1,7 @@
 import Phaser from 'phaser';
 import type { JSX } from 'react';
 
-import { Container, createRef } from '..';
+import { Container } from '..';
 import { createGameObject } from './gameobject';
 
 jest.mock('phaser', () => {