If you have tests in your repository, and selected yes when prompted during app creation, the primary Workflow will include the Flutter Test Step by default.
If you add tests to your app later, add the Flutter Test Step to your Workflow manually. The Step runs the flutter test command with the specified flags. To check the available flags, open a command line interface on your own machine and run flutter test --help.
flutter test command in the Additional parameters field.Make sure the Project Location input of the Flutter Test Step is correct. The default value is the Environment Variable (Env Var) created for your Flutter project’s location.