Jest configuration

[partykyoung]

 ● Test suite failed to run
    SecurityError: localStorage is not available for opaque origins
      
      at Window.get localStorage [as localStorage] (node_modules/jsdom/lib/jsdom/browser/Window.js:257:15)
      at Array.forEach (native)

I saw this error message, So I looked for a way to fix this error and found this link and added testUrl to package.json.

jsdom/jsdom#2304

[Aljullu]

Hi @partykyoung, thanks for working on this! I think we should merge this PR first and merge the other one later.

A couple of comments about this PR:

• I see there are some changes in the file LazyLoadImage.jsx which I think they don't belong in this PR. Could you undo those changes?

• Actually, looking at the commit history it's a bit messy, I think this change should be implemented in one single commit instead of six like it's now. :)

If you agree with me, I would proceed like this: create a new branch directly from master and implement the changes in package.json and LazyLoadImage.spec.js from this PR. Then, create the PR with those changes.

In another branch, also forked from master, I would implement the changes from #3, which were already looking fine. :)

[partykyoung]

@Aljullu
I thought LazyLoadImage.jsx had nothing to do with jest configuration, so I rollbacked it at this branch.

I agree with your comment.

[Aljullu]

@partykyoung did you have time to take a look at this? Let me know if you have any issues with the proposed solution or need any help and i will kindly support you!

[Aljullu]

I'm gonna proceed closing this PR because I implemented the changes in #5, I wanted to get it merged fast because builds were failing. But thanks for working on this @partykyoung! 🙂