MyBloc() : super(MyState()) {
  on<MyEvent>(
    _myEvent,
    transformer: concurrent(),
  );
}

abstract class MyAbstractEvent {}
class OtherEvent extends MyAbstractEvent {}

MyBloc() : super(MyState()) {
  on<MyAbstractEvent>(
    …,
    transformer: concurrent(),
  );
}

flutter test --coverage

sudo apt-get update -qq -y
sudo apt-get install lcov -y

brew install lcov

genhtml coverage/lcov.info -o coverage/html

file=test/coverage_helper_test.dart
echo "// Helper file to make coverage work for all files\n" > $file
echo "// ignore_for_file: unused_import" > $file
find lib -name "*.dart" "!" -name "*.g.dart" | cut -c4- | awk -v package="my_package" '{printf "import '\''package:%s%s'\'';\n", package, $1}' >> $file
echo "void main(){}" >> $file

./coverage_helper.sh

package=$1
if [ ! -d “test” ]; then
  mkdir test
fi

package=$package

escapedPath=”$(echo pwd | sed ‘s/\//\\\//g’)”
if grep flutter pubspec.yaml > /dev/null; then
  if [ -d “coverage” ]; then
    if [ ! -d “$MELOS_ROOT_PATH/coverage_report” ]; then
      mkdir “$MELOS_ROOT_PATH/coverage_report”!
    fi
    sed “s/^SF:lib:$escapedPath\/lib/g” coverage/lcov.info >> “$MELOS_ROOT_PATH/coverage_report/lcov.info”
    rm -rf “coverage”
  fi
fi

abstract interface class IPushService {
  Future<void> init();
  Future<String> getToken();
  Future<void> onOpenPush();
}

  mobile_services_interface:
    path: ../mobile_services_interface
  firebase_messaging: ^latest_version

  mobile_services_interface:
    path: ../mobile_services_interface
  huawei_push: ^latest_version

dart pub global activate mason_cli

mason init

mason add (имя шаблона)

vars:
  name:
    type: string
    description: Name of your class

mason make (имя шаблона)

class {{name.snakeCase()}} {
  final String {{name.camelCase()}}

  {{name.snakeCase()}}(
    this.{{name.camelCase()}},
  );
}

class MyClass{
  final String myClass;

  MyClass(
    this.myClass,
  );
}