message: send non-mobx object to playbackStarted
diff: @@ -457,7 +457,7 @@ class PlaybackState {
  testName: this.currentRunningTest.name,
  suiteName: this.currentRunningSuite && this.currentRunningSuite.name,
  projectName: UiState._project.name,
  - test: this.currentRunningTest,
  + test: this.currentRunningTest.export(),
  },
  },
  cb
  