Flutter -如何在小部件测试中选择DropdownButton项目

import 'package:flutter_test/flutter_test.dart';
import 'package:flutter/material.dart';

void main() {
  testWidgets('DropdownButton test', (WidgetTester tester) async {
    // 测试代码
  });
}

await tester.pumpWidget(
  MaterialApp(
    home: Scaffold(
      body: DropdownButton<String>(
        items: <String>['Option 1', 'Option 2', 'Option 3']
            .map((String value) {
          return DropdownMenuItem<String>(
            value: value,
            child: Text(value),
          );
        }).toList(),
        onChanged: (String newValue) {
          // 处理选择的值
        },
      ),
    ),
  ),
);

await tester.tap(find.text('Option 1'));
await tester.pump();

expect(find.text('Option 1'), findsOneWidget);