Adding unit tests for multiple files

[lucifercr07]

In core package many files don't have unit tests associated to them. Create unit tests for those e.g: eval.go, commands.go, events.go.

[lucifercr07]

@JyotinderSingh please assign this to me, have started working. Don't have access to add labels please add them.

[JyotinderSingh]

@JyotinderSingh please assign this to me, have started working.

Don't have access to add labels please add them.

Assigned, also could you create a separate issue for all files? This way more people can contribute and it's easier to track.

[AshwinKul28]

Thanks @lucifercr07 for contributing. Closing this issue! Status - shipped 🚀