Throw MissingPluginException when test starts

[TimurNasirov]

I use code from example in pub.dev. When I clicked "Start Testing", I see infinte loading and error in terminal:

DartError: MissingPluginException(No implementation found for method toggleLog on channel com.shaz.plugin.fist/method)
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 296:3  throw_
packages/flutter/src/services/platform_channel.dart 332:7                    _invokeMethod
dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 45:50           <fn>
dart-sdk/lib/async/zone.dart 1661:54                                         runUnary
dart-sdk/lib/async/future_impl.dart 163:18                                   handleValue
dart-sdk/lib/async/future_impl.dart 861:44                                   handleValueCallback
dart-sdk/lib/async/future_impl.dart 890:13                                   _propagateToListeners
dart-sdk/lib/async/future_impl.dart 666:5                                    [_completeWithValue]
dart-sdk/lib/async/future_impl.dart 736:7                                    callback
dart-sdk/lib/async/schedule_microtask.dart 40:11                             _microtaskLoop
dart-sdk/lib/async/schedule_microtask.dart 49:5                              _startMicrotaskLoop
dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 181:7           <fn>
┌───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
│ #0   packages/flutter_internet_speed_test/src/flutter_internet_speed_test_method_channel.dart 233:9  getDefaultServer
├┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄
│ 🐛 ClientException: XMLHttpRequest error., uri=https://fast.com/app-a32983.js
└───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
┌───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
│ #0   packages/flutter_internet_speed_test/src/flutter_internet_speed_test_method_channel.dart 152:7   _startListening
│ #1   packages/flutter_internet_speed_test/src/flutter_internet_speed_test_method_channel.dart 142:42  [_startListening]
├┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄
│ 🐛 test 0
└───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
DartError: MissingPluginException(No implementation found for method startListening on channel com.shaz.plugin.fist/method)
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 296:3  throw_
packages/flutter/src/services/platform_channel.dart 332:7                    _invokeMethod
dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 45:50           <fn>
dart-sdk/lib/async/zone.dart 1661:54                                         runUnary
dart-sdk/lib/async/future_impl.dart 163:18                                   handleValue
dart-sdk/lib/async/future_impl.dart 861:44                                   handleValueCallback
dart-sdk/lib/async/future_impl.dart 890:13                                   _propagateToListeners
dart-sdk/lib/async/future_impl.dart 666:5                                    [_completeWithValue]
dart-sdk/lib/async/future_impl.dart 736:7                                    callback
dart-sdk/lib/async/schedule_microtask.dart 40:11                             _microtaskLoop
dart-sdk/lib/async/schedule_microtask.dart 49:5                              _startMicrotaskLoop
dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 181:7           <fn>
DartError: MissingPluginException(No implementation found for method cancelTest on channel com.shaz.plugin.fist/method)
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 296:3  throw_
packages/flutter/src/services/platform_channel.dart 332:7                    _invokeMethod
dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 45:50           <fn>
dart-sdk/lib/async/zone.dart 1661:54                                         runUnary
dart-sdk/lib/async/future_impl.dart 163:18                                   handleValue
dart-sdk/lib/async/future_impl.dart 861:44                                   handleValueCallback
dart-sdk/lib/async/future_impl.dart 890:13                                   _propagateToListeners
dart-sdk/lib/async/future_impl.dart 666:5                                    [_completeWithValue]
dart-sdk/lib/async/future_impl.dart 736:7                                    callback
dart-sdk/lib/async/schedule_microtask.dart 40:11                             _microtaskLoop
dart-sdk/lib/async/schedule_microtask.dart 49:5                              _startMicrotaskLoop
dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 181:7           <fn>
DartError: MissingPluginException(No implementation found for method toggleLog on channel com.shaz.plugin.fist/method)
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 296:3  throw_
packages/flutter/src/services/platform_channel.dart 332:7                    _invokeMethod
dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 45:50           <fn>
dart-sdk/lib/async/zone.dart 1661:54                                         runUnary
dart-sdk/lib/async/future_impl.dart 163:18                                   handleValue
dart-sdk/lib/async/future_impl.dart 861:44                                   handleValueCallback
dart-sdk/lib/async/future_impl.dart 890:13                                   _propagateToListeners
dart-sdk/lib/async/future_impl.dart 666:5                                    [_completeWithValue]
dart-sdk/lib/async/future_impl.dart 736:7                                    callback
dart-sdk/lib/async/schedule_microtask.dart 40:11                             _microtaskLoop
dart-sdk/lib/async/schedule_microtask.dart 49:5                              _startMicrotaskLoop
dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 181:7           <fn>

I tried:

1. Restart app (exit from debug and run flutter run again)
2. Run flutter clean
3. Reinstall flutter_internet_speed_test (flutter pub remove and flutter pub add)
4. Close VS Code and open it again

When I use other library named flutter_speedtest, it works, but there is can not disable calculating ping and download (I need to get only upload data)