(Gsoc'21) (Week-8,9,10) Adding headless testing

[satyasaibhushan]

• Added mocha-chrome as a grunt task, which is borrowed from p5.js.
• I changed the test filing architecture and the initialisation of expect in all test files so that all the files goes to one spec array.
• Added karma-js as it seems more consistent with tests.
• We currently, cannot use it in github automations as it is still not 100 % reliable. Some tests are still failing in some cases.
• We can add retry functionality to some tests which can be identified as failing and maybe one day in future, we can add it to github actions.

[Abhijay007]

@satyasaibhushan can you please look into the merge conflicts, if you are busy I can resolve those conflicts and make a new PR fixing merge conflicts around the same :) it will be great if we are able to implement headless testing, as you mentioned various uses cases of the same in the PR description.

[satyasaibhushan]

@Abhijay007 Yeah. Go ahead and resolve the conflicts.

[Abhijay007]

@Abhijay007 Yeah. Go ahead and resolve the conflicts.

sure :)