💭 Description

Add unit tests for each SDK

For reference on how to do this, refer to the Flutter/Dart templates: #673

• android
• cli - not needed
• dart - completed as part of Flutter SDK: tests for services #673
• deno
• dotnet
• 🐛 Bug Report: You've forgotten to add unit tests to the repo sdk-for-flutter#90 - completed as part of Flutter SDK: tests for services #673
• go - not ready
• graphql/docs - not needed
• kotlin
• node
• php
• python
• rest/docs - not needed
• ruby
• swift
• web - ⌛ @tewarig

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

• I checked and didn't find similar issue

🏢 Have you read the Code of Conduct?

• I have read the Code of Conduct