Open index.html for example, checkout #step1-9 and let the test pass to complete the framework.

npm install jest

1. Let's create element!
2. Let's create DOM!
3. Let's create Components!
4. Let's create class!
5. Let's mount Components!
6. Let's render!
7. Let's getNode by ReactID!
8. Let's capture event!
9. Let's update!