如何在颤振驱动中测试ImagePicker？

dev_dependencies:
  flutter_driver:
    sdk: flutter
  image_picker: ^0.8.4+4

import 'package:flutter_driver/flutter_driver.dart';
import 'package:image_picker/image_picker.dart';
import 'dart:async';

void main() {
  group('ImagePicker Test', () {
    FlutterDriver driver;

    setUpAll(() async {
      driver = await FlutterDriver.connect();
    });

    tearDownAll(() async {
      if (driver != null) {
        await driver.close();
      }
    });

    test('pick image from gallery', () async {
      // 假设你有一个按钮，点击后会打开相册
      final buttonFinder = find.byValueKey('pickImageButton');
      await driver.tap(buttonFinder);

      // 等待 ImagePicker 的弹窗出现
      await driver.waitFor(find.byType('ImagePicker'));

      // 模拟选择第一张图片
      final imageFinder = find.byValueKey('image_0');
      await driver.tap(imageFinder);

      // 等待图片选择完成的提示
      await driver.waitFor(find.text('Image picked'));
    });
  });
}

flutter drive --target=test_driver/image_picker_test.dart