如何在flutter widget测试中发出http请求？

import 'package:flutter_test/flutter_test.dart';
import 'package:http/http.dart' as http;

void main() {
  testWidgets('Test HTTP request', (WidgetTester tester) async {
    // 发出HTTP GET请求
    var response = await http.get(Uri.parse('https://api.example.com/data'));

    // 断言响应状态码为200
    expect(response.statusCode, 200);

    // 解析响应数据
    var data = response.body;

    // 断言数据不为空
    expect(data.isNotEmpty, true);

    // 在控制台打印响应数据
    print(data);
  });
}

import 'package:flutter_test/flutter_test.dart';
import 'package:http/http.dart' as http;
import 'package:http/testing.dart';

void main() {
  testWidgets('Test HTTP request', (WidgetTester tester) async {
    // 创建一个MockClient
    var client = MockClient((request) async {
      // 返回模拟的响应数据
      return http.Response('{"message": "Hello, World!"}', 200);
    });

    // 使用MockClient发出HTTP GET请求
    var response = await client.get(Uri.parse('https://api.example.com/data'));

    // 断言响应状态码为200
    expect(response.statusCode, 200);

    // 解析响应数据
    var data = response.body;

    // 断言数据不为空
    expect(data.isNotEmpty, true);

    // 在控制台打印响应数据
    print(data);
  });
}