Adding unit tests for parser.py

[PhillypHenning]

Description

Adds to #286

Adding unit tests for parser.py

Type of change

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

This is the testing. Logs are included below.

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation

[runforesight]

Foresight Summary

    
Major Impacts
Foresight hasn't detected any major impact on your workflows and tests.

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❌  CI workflow has finished in 56 seconds and finished at 20th Mar, 2023. 1 job failed.

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Job	Failed Steps	Tests
tests-unit	Run unit tests     🔗	N/A	See Details
lint-pylint	-     🔗	N/A	See Details
lint-black	-     🔗	N/A	See Details

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[PhillypHenning]

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Ran 26 tests in 0.037s