🚀 Feature: Unit Tests

[stnguyen90]

💭 Description

Add unit tests for each SDK

For reference on how to do this, refer to the Flutter/Dart templates: https://github.com/appwrite/sdk-generator/pull/673

• [ ] android
• [x] cli - not needed
• [x] dart - completed as part of https://github.com/appwrite/sdk-generator/pull/673
• [ ] deno
• [ ] dotnet
• [x] https://github.com/appwrite/sdk-for-flutter/issues/90 - completed as part of https://github.com/appwrite/sdk-generator/pull/673
• [x] go - not ready
• [x] graphql/docs - not needed
• [ ] kotlin
• [ ] node
• [ ] php
• [ ] python
• [x] rest/docs - not needed
• [ ] ruby
• [ ] swift
• [ ] web - ⌛ @tewarig

👀 Have you spent some time to check if this issue has been raised before?

• [X] I checked and didn't find similar issue

🏢 Have you read the Code of Conduct?

• [X] I have read the Code of Conduct