Unable to get the device type while running flutter driver.

[TharaniP]

Hi mmcc007,
I am trying to get the device type using screenshots package. For that i have activated screenshots using this command: pub global activate screenshots.
And added screenshots: ^2.1.1 pub dependency in yaml file in my app.
Then added screenshots.yaml file in the root directory.

1. screenshots.yaml:

Screen capture tests

Note: flutter driver expects a pair of files eg, main.dart and main_test.dart

tests:

• test_driver/app.dart
• test_driver/app_test.dart

Interim location of screenshots from tests before processing

staging: /tmp/screenshots

A list of locales supported in app

locales:

• en-US

A list of devices to run tests on

devices:
ios:
iPhone 11 Pro Max:
frame: false
android:

Frame screenshots

frame: false

2. app_test.dart:

import 'package:flutter_driver/flutter_driver.dart';
import 'package:screenshots/screenshots.dart';
import 'package:test/test.dart';
void main() {

group('Forward Ten4_Test_Automation', () {
FlutterDriver driver;
setUpAll(() async {

final config = Config(configPath: 'screenshots.yaml');

final screenshotsEnv = config.screenshotsEnv;
print('screenshotsEnv: $screenshotsEnv');

driver = await FlutterDriver.connect();
}
});
}

While running this command flutter drive --target=test_driver/app.dart, getting the following error:

FileSystemException: Cannot open file, path = '/tmp/screenshots/env.json' (OS Error: No such file or directory, errno = 2)

dart:io/file_impl.dart 356:9 _File.open.
package:stack_trace/src/stack_zone_specification.dart 126:26 StackZoneSpecification._registerUnaryCallback..
package:stack_trace/src/stack_zone_specification.dart 208:15 StackZoneSpecification._run
package:stack_trace/src/stack_zone_specification.dart 126:14 StackZoneSpecification._registerUnaryCallback.
dart:async/zone.dart 1198:47 _rootRunUnary
dart:async/zone.dart 1100:19 _CustomZone.runUnary
dart:async/future_impl.dart 143:18 _FutureListener.handleValue
dart:async/future_impl.dart 696:45 Future._propagateToListeners.handleValueCallback
dart:async/future_impl.dart 725:32 Future._propagateToListeners
dart:async/future_impl.dart 529:5 Future._completeWithValue
dart:async/future_impl.dart 567:7 Future._asyncCompleteWithValue.
package:stack_trace/src/stack_zone_specification.dart 208:15 StackZoneSpecification._run
package:stack_trace/src/stack_zone_specification.dart 116:48 StackZoneSpecification._registerCallback.
dart:async/zone.dart 1190:13 _rootRun
dart:async/zone.dart 1093:19 _CustomZone.run
dart:async/zone.dart 997:7 _CustomZone.runGuarded
dart:async/zone.dart 1037:23 _CustomZone.bindCallbackGuarded.
dart:async/schedule_microtask.dart 41:21 _microtaskLoop
dart:async/schedule_microtask.dart 50:5 _startMicrotaskLoop
dart:isolate-patch/isolate_patch.dart 118:13 _runPendingImmediateCallback
dart:isolate-patch/isolate_patch.dart 169:5 _RawReceivePortImpl._handleMessage
===== asynchronous gap ===========================
dart:async/zone.dart 1121:19 _CustomZone.registerUnaryCallback
dart:async/future_impl.dart 280:23 Future.then
dart:io/file_impl.dart 354:60 _File.open
dart:io/file_impl.dart 527:12 _File.readAsBytes
dart:io/file_impl.dart 574:12 _File.readAsString
package:screenshots/src/config.dart 141:51 Config._retrieveEnv
package:screenshots/src/config.dart 109:42 Config.screenshotsEnv
test_driver/app_test.dart 21:37 main..
package:test_api/src/backend/declarer.dart 310:70 Declarer._setUpAll...
dart:async/future.dart 512:26 Future.forEach.
dart:async/future.dart 554:26 Future.doWhile.
package:stack_trace/src/stack_zone_specification.dart 126:26 StackZoneSpecification._registerUnaryCallback..
package:stack_trace/src/stack_zone_specification.dart 208:15 StackZoneSpecification._run
package:stack_trace/src/stack_zone_specification.dart 126:14 StackZoneSpecification._registerUnaryCallback.
dart:async/zone.dart 1198:47 _rootRunUnary
dart:async/zone.dart 1100:19 _CustomZone.runUnary
dart:async/zone.dart 1005:7 _CustomZone.runUnaryGuarded
dart:async/zone.dart 1042:26 _CustomZone.bindUnaryCallbackGuarded.
dart:async/future.dart 570:18 Future.doWhile
dart:async/future.dart 510:12 Future.forEach
package:test_api/src/backend/declarer.dart 310:24 Declarer._setUpAll..
dart:async/zone.dart 1190:13 _rootRun
dart:async/zone.dart 1093:19 _CustomZone.run
dart:async/zone.dart 1630:10 _runZoned
dart:async/zone.dart 1550:10 runZoned
package:test_api/src/backend/declarer.dart 309:14 Declarer._setUpAll.
package:test_api/src/backend/invoker.dart 231:15 Invoker.waitForOutstandingCallbacks.
dart:async/zone.dart 1190:13 _rootRun
dart:async/zone.dart 1093:19 _CustomZone.run
dart:async/zone.dart 1630:10 _runZoned
dart:async/zone.dart 1550:10 runZoned
package:test_api/src/backend/invoker.dart 228:5 Invoker.waitForOutstandingCallbacks
package:test_api/src/backend/invoker.dart 383:17 Invoker._onRun...
===== asynchronous gap ===========================
dart:async/zone.dart 1121:19 _CustomZone.registerUnaryCallback
dart:async/zone.dart 1041:22 _CustomZone.bindUnaryCallbackGuarded
dart:async/future.dart 550:34 Future.doWhile
dart:async/future.dart 510:12 Future.forEach
package:test_api/src/backend/declarer.dart 310:24 Declarer._setUpAll..
dart:async/zone.dart 1190:13 _rootRun
dart:async/zone.dart 1093:19 _CustomZone.run
dart:async/zone.dart 1630:10 _runZoned
dart:async/zone.dart 1550:10 runZoned
package:test_api/src/backend/declarer.dart 309:14 Declarer._setUpAll.
package:test_api/src/backend/invoker.dart 231:15 Invoker.waitForOutstandingCallbacks.
dart:async/zone.dart 1190:13 _rootRun
dart:async/zone.dart 1093:19 _CustomZone.run
dart:async/zone.dart 1630:10 _runZoned
dart:async/zone.dart 1550:10 runZoned
package:test_api/src/backend/invoker.dart 228:5 Invoker.waitForOutstandingCallbacks
package:test_api/src/backend/invoker.dart 383:17 Invoker._onRun...
===== asynchronous gap ===========================
dart:async/zone.dart 1121:19 _CustomZone.registerUnaryCallback
dart:async-patch/async_patch.dart 83:23 _asyncThenWrapperHelper
package:test_api/src/backend/invoker.dart Invoker._onRun...
dart:async/zone.dart 1190:13 _rootRun
dart:async/zone.dart 1093:19 _CustomZone.run
dart:async/zone.dart 1630:10 _runZoned
dart:async/zone.dart 1550:10 runZoned
package:test_api/src/backend/invoker.dart 370:9 Invoker._onRun..
package:test_api/src/backend/invoker.dart 415:15 Invoker._guardIfGuarded
package:test_api/src/backend/invoker.dart 369:7 Invoker._onRun.
package:stack_trace/src/chain.dart 104:24 Chain.capture.
dart:async/zone.dart 1190:13 _rootRun
dart:async/zone.dart 1093:19 _CustomZone.run
dart:async/zone.dart 1630:10 _runZoned
dart:async/zone.dart 1550:10 runZoned
package:stack_trace/src/chain.dart 102:12 Chain.capture
package:test_api/src/backend/invoker.dart 368:11 Invoker._onRun
package:test_api/src/backend/live_test_controller.dart 153:11 LiveTestController.run
dart:async/future.dart 201:37 new Future.microtask.
dart:async/zone.dart 1182:47 _rootRun
dart:async/zone.dart 1093:19 _CustomZone.run
dart:async/zone.dart 997:7 _CustomZone.runGuarded
dart:async/zone.dart 1037:23 _CustomZone.bindCallbackGuarded.
dart:async/zone.dart 1190:13 _rootRun
dart:async/zone.dart 1093:19 _CustomZone.run
dart:async/zone.dart 997:7 _CustomZone.runGuarded
dart:async/zone.dart 1037:23 _CustomZone.bindCallbackGuarded.
dart:async/schedule_microtask.dart 41:21 _microtaskLoop
dart:async/schedule_microtask.dart 50:5 _startMicrotaskLoop
dart:isolate-patch/isolate_patch.dart 118:13 _runPendingImmediateCallback
dart:isolate-patch/timer_impl.dart 404:11 _Timer._runTimers
dart:isolate-patch/timer_impl.dart 428:5 _Timer._handleMessage
dart:isolate-patch/isolate_patch.dart 168:12 _RawReceivePortImpl._handleMessage

Expected Result: I am trying to get the device type like below while running flutter driver.

     final screenshotsEnv = await config.screenshotsEnv;
     if (screenshotsEnv['device_type'] == 'ios') { } else {}