Improve unit test coverage and fix minor bug

[snake14]

Description

Add more unit tests and fix a few issues in the annotation generation. If you ignore the tests/Resources/ directory, there weren't that many changes.

Issue No

PG-4601

Steps to Replicate the Issue

1. Not much to test. I guess you could run the annotation generator for a plugin and look at the annotations.

Checklist

• [✔] Tested locally or on demo2/demo3?
• [✔] New test case added/updated?
• [NA] Are all newly added texts included via translation?
• [NA] Are text sanitized properly? (Eg use of v-text v/s v-html for vue)
• [NA] Version bumped?

[AltamashShaikh]

Looks okay to me