Added offix library unit tests

[ParthPali]

Description

Include a summary of the change and relevant motivation/context. List any dependencies that are required for this change.

Fixes #169

Type of Change:

Delete irrelevant options.

• Code
• Quality Assurance
• User Interface
• Outreach
• Documentation

Code/Quality Assurance Only

• Bug fix (non-breaking change which fixes an issue)
• This change requires a documentation update (software upgrade on readme file)
• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

Describe the tests you ran to verify your changes. Provide instructions or GIFs so we can reproduce. List any relevant details for your test.

Checklist

• [x] tests are included
• [x] documentation is changed or added
• [x] My changes generate no new warnings/errors

[ParthPali]

[Lavanyagaur22]

Good work @ParthPali :)