[WIP] add tests

[kota65535]

I experimentally added testing based on visual regression test with nightwatch.js.

Idea

In visual regression test, a baseline screenshot and a current screenshot of a target page url are expected to be the same image. Normally both screenshots are taken on the same url.
Borrowing this idea for testing PaperRenderer, screenshots of following pages should be compared.

• Baseline: the page drawn by vanilla paper library
• Current: the page drawn by PaperRenderer

What I Implemented

• created testing app by create-react-app inside test folder
• testing app has two pages showing a react logo. As I mentioned above, the one is drawn by vanilla paper and the other is by PaperRenderer.
• running npm run test first launches testing app, and then run nightwatch to compare screenshots of the pages.

I confirmed it works on MacOS.

Reference

htps://github.com/Rykus0/nightwatch-visual-regression

[HriBB]

Awesome! I will review the changes when I get back home next week.