anchor.diff:    }
   ];
   
  -main(args) async => runVMTests(args, tests,
  +main(args) async => runIsolateTests(args, tests,
       pause_on_start: true, pause_on_exit: true, testeeConcurrent: test);
  
positive.code:                   "should stop at debugger() after exception.\n"
                    "Probably the second resumed even though it was not expect "
                    "to do it.");
            expect(c.isolate.id, equals(vm.isolates[0].id),
                reason: "First "
                    "isolate should stop at debugger() after exception.\n"
                    "Probably the second resumed even though it was not expect "
  
negative.code:           completer.complete();
            break;
          default:
            fail("Shouldn't get here, the second isolate resumed even though it "
                "was not expect to do it");
            break;
        }
        step++;
      });
      firstIsolate.resume();
      await completer.future;
      // We wait 1 second to account for delays in the service protocol.
      // A late message can still arrive.
  