anchor.diff:  import 'package:devtools/src/vm_service_wrapper.dart';
   import 'package:vm_service_lib/vm_service_lib.dart';
   import 'package:vm_service_lib/vm_service_lib_io.dart';
  +
  +import '../integration_tests/integration.dart';
   
   class AppFixture {
     AppFixture._(
  
positive.code:   static Future<CliAppFixture> create(String appScriptPath) async {
      final Process process = await Process.start(
        Platform.resolvedExecutable,
        <String>['--observe=0', appScriptPath],
      );
  
      final Stream<String> lines =
  
negative.code:       serviceConnection,
        vm.isolates,
      );
    }
  
    static Future<Isolate> _waitForIsolate(
      VmServiceWrapper serviceConnection,
      String pauseEventKind,
    ) async {
      Isolate foundIsolate;
      await waitFor(() async {
        final vm = await serviceConnection.getVM();
        final isolates = await Future.wait(
          vm.isolates.map((ref) => serviceConnection.getIsolate(ref.id)),
        );
        foundIsolate = isolates.firstWhere(
          (isolate) =>
              isolate is Isolate && isolate.pauseEvent.kind == pauseEventKind,
          orElse: () => null,
        );
        return foundIsolate != null;
      });
      return foundIsolate;
    }
  
    String get scriptSource {
  