277 add test to verify license identifier placement in files

[r59q]

Adds a test that will check that all files in /src/ have a license identifier, ensuring all future files includes it before pushing to main branch. Workflow should succeed after #276 has been merged. Merge that first.
files can be excluded from the list if required.

// Place files you wish to ignore by name in here
const ignoredFiles: string[] = [];

It also gives you a list of files that are missing identifiers

[Karlo-Emilo]

I understand that the new test should fail, but is seems like it completes with an error. Is it intended?

[r59q]

I understand that the new test should fail, but is seems like it completes with an error. Is it intended?

Well it depends on what jest considers an error. All but the new test succeed. Therefore it reports an error. However there are no compilation issues.
The logs and warnings are, although obnoxious, just a product of the tests themselves. If we test that a given procedure should fail and result in an error, when running the test an error will be thrown and be printed in the console alongside a stack trace. However this was the expected output of the test, and therefore it will pass.

As long as jest produces and spits out a result, we are good.

i.e if we see the following, the tests ran successfully