test: implement unit testing for post-type enrollment

[julianramirez2]

Description

A unit test was performed to verify that the creation of post-type objects was being done correctly for both auto-generated objects and those generated for each record entered as an "enrollment request".

Testing instructions

To test it within GitHub, we can review the phpunit GitHub Action and verify that this test passed. If we want to perform a manual review locally, follow these steps:

If composer is not installed:

• Install Composer in the root folder of the plugin.
• Install phpunit version 9.* using Composer.
• Optional: Install xdebug to generate coverage test locally.
• In the terminal, navigate to the root folder of the plugin.
• Run the command php vendor/bin/phpunit --coverage-text test.

If composer is installed:

• In the terminal, navigate to the root folder of the plugin.
• Run the command php vendor/bin/phpunit --coverage-text test.

Additional information

In case of doubts regarding the coverage values, they might be low because the code is tested using "mock" objects. These are simulated objects that contain the functionalities we want to prevent from being executed, mimicking the behavior of real objects in a controlled environment.

Checklist for Merge

• Tested in a remote environment
• Rebased master/main
• Squashed commits

[MaferMazu]

Hello, @julianramirez2; thank you for this PR. Please let me know when the test has passed so I can review this.