Add is_input_header negative test

[Ann-Clawson]

Thank you for taking your time to contribute to Ersilia, just a few checks before we proceed

• Have you followed the guidelines in our Contribution Guide
• Have you written new tests for your core changes, as applicable?
• Have you successfully ran tests with your changes locally?

Description

Add a CompoundIdentifier class test test_is_input_header_negative in test/test_compound_identifier.py which I noticed was created in a previous open pull request for test_is_input_header_positive.

Changes to be made

Status

• Implemented test_is_input_header_negative in test/test_compound_identifier.py
• Tested the code locally with pytest and passed

To do

Is this pull request related to any open issue? If yes, replace issueID below with the issue ID

Related to #1319

[Ann-Clawson]

Oh! I forgot to add in the "Description" section of the PR that I also added a requirements.txt file to streamline the installation of dependencies.

[dzumii]

@Ann-Clawson Thank you so much for contributing to Ersilia but this issue is specifically for current Outreachy contributors.

[DhanshreeA]

@Ann-Clawson as @dzumii mentioned we're currently not accepting contributions from anyone other than Outreachy applicants. If your PR is towards Hacktoberfest, I will have to request you to check out other participating projects. Thank you!

[Ann-Clawson]

Oh! I found this repository on For Good First Issue. I'm a mid-life career changer and entry-level dev seeking opportunities to get a foot in the door of the tech world (I'm currently learning how to write unit tests 🙃). Thank you for your response, I was unaware of Outreachy and will keep an eye out for May cohort applications!