test(@toss/utils): Add getViewportSize Test Code

[ssi02014]

Overview

I wrote a simple test code for thegetViewportSize function in toss/utils.

References

• Set Size of Window in Jest

Object.defineProperty(window, 'innerWidth', { writable: true, configurable: true, value: 300 });

• jsdom default Value (innerWidth: 1024, innerHeight: 768)

PR Checklist

• I read and included theses actions below

1. I have read the Contributing Guide
2. I have written documents and tests, if needed.

[netlify]

👷 Deploy request for slash-libraries pending review.

Visit the deploys page to approve it

Name	Link
🔨 Latest commit	7ccce63

[okinawaa]

It is similar with #259 !

[ssi02014]

@okinawaa
Oh, right..!!!!

Please refer to my pull request if needed (ex. jsdom default value)

I'm going to close the pull request.