I have a Flutter app with chat functionality, where the chats are stored in Firebase database. I have a BottomNavigationBar which has an icon button for Chats. On this icon I display a badge if there are any unread chats: BottomNavigationB...

I am trying to implement unit tests for my Service. Currently I wanna test a service, which allows a user to add a tag into a group, with requirement for a group to not contain duplicate tag names. That means that you are able to add two tags with same nam...