00:03 +23 -1: run.dart script Exits with code 1 when fails to connect
  Expected: <1>
    Actual: <0>

  package:test             expect
  test/run_test.dart 37:7  main.<fn>.<fn>.<async>
  ===== asynchronous gap ===========================
  dart:async               _Completer.completeError
  test/run_test.dart 38:6  main.<fn>.<fn>.<async>
  ===== asynchronous gap ===========================
  dart:async               _asyncThenWrapperHelper
  test/run_test.dart       main.<fn>.<fn>