anchor.diff:  
       final VM vm = await serviceConnection.getVM();
   
  +    final Isolate isolate =
  +        await _waitForIsolate(serviceConnection, 'PauseStart');
  +    await serviceConnection.resume(isolate.id);
  +
       return CliAppFixture._(
         appScriptPath,
         process,
  
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: 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._(
  