in tool/common.dart [36:51]
Future<void> flutterRun(String script) async {
final Process proc = await Process.start(
'flutter', <String>['run', '-d', 'flutter-tester', '-t', script]);
proc.stdout
.transform(utf8.decoder)
.transform(const LineSplitter())
.listen(stdout.writeln);
proc.stderr
.transform(utf8.decoder)
.transform(const LineSplitter())
.listen(stderr.writeln);
final int exitCode = await proc.exitCode;
if (exitCode != 0) {
throw 'Process exited with code $exitCode';
}
}