guard<T> static method

T? guard<T>(T callback())

Runs callback in a zone where unhandled errors from LiveTests are caught and dispatched to the appropriate Invoker.

Implementation

static T? guard<T>(T Function() callback) => runZoned<T?>(
  callback,
  zoneSpecification: ZoneSpecification(
    // Use [handleUncaughtError] rather than [onError] so we can
    // capture [zone] and with it the outstanding callback counter for
    // the zone in which [error] was thrown.
    handleUncaughtError: (self, _, zone, error, stackTrace) {
      var invoker = zone[#test.invoker] as Invoker?;
      if (invoker != null) {
        self.parent!.run(() => invoker._handleError(zone, error, stackTrace));
      } else {
        self.parent!.handleUncaughtError(error, stackTrace);
      }
    },
  ),
);