🚀 Feature: Unit Tests

### 💭 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](https://github.com/appwrite/appwrite/blob/HEAD/CODE_OF_CONDUCT.md)