Codebase Unit Tests

[chrisdedman]

Description

Currently, the codebase does not have many unit tests. We want to add unit test coverage using pytest for at least every extensions.

Extensions:

• Bookmark Cog
• Code Generator Cog
• Color Cog
• Extension Cog
• Fun Cog
• Grace Cog
• Language Cog
• Mermaid Cog
• Moderation Cog
• Pun Cog
• Reddit Cog
• Reminder Cog
• Thank Cog
• Threads Cog
• Time Cog
• Translator Cog
• Weather Cog
• Welcome Cog
• Wikipedia Cog

Anyone feel free to take on a cog listed above. Make sure to mention it here or on Discord to avoid multiple people working on the same test. I will update the list once the unit tests are merged.

Thank you to anyone contributing to this update.