Add Widget Testing

[OverPoweredDev]

Is your feature request related to a problem? Please describe.
The project as it is right now has no testing. Commits are pushed directly to main after a formatting check and while not a problem usually, some tests would really be appreciated.

Describe the solution you'd like
modify and update the files in Junior/src/test/

Additional context
Thanks to #12, we now have automated testing for the project, but it only consists of a format check and an Empty test that only runs the app and closes it. So all the background stuff is clear, we just need to add widget testing

[ShrutiJ-01]

I would like to give it a try!

[OverPoweredDev]

Happy to let you!

Just a small note, run these few lines before you send a PR. I'll modify Actions later but till then it complains about even linting issues

flutter format .
flutter analyze .