Test: Added unit test cases for PathProcessor

[aamfahim]

Description

Added Unit test for PathProcessor Block service

Closes #186

What change does this PR introduce?

Please select the relevant option(s).

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update (changes to docs/code comments)

What is the proposed approach?

The goal is to test all the possible logical flows of PathProcessor.test.ts service and using jest.mock to mock functionality where applicable.

Checklist:

• The commit message follows our adopted guidelines
• Testing has been done for the change(s) added (for bug fixes/features)
• Relevant comments/docs have been added/updated (for bug fixes/features)

[tjtanjin]

LGTM! 😊