samples/code_sharing/server/test/server_test.dart

import 'dart:convert';
import 'dart:io';

import 'package:http/http.dart';
import 'package:test/test.dart';

// Manual test:
// $ dart bin/server.dart
// $ curl -X POST -d '{"by": 1}' -H "Content-Type: application/json" localhost:8080/

void main() {
  final port = '8080';
  final host = 'http://0.0.0.0:$port';
  late Process p;

  setUp(() async {
    p = await Process.start(
      'dart',
      ['run', 'bin/server.dart'],
      environment: {'PORT': port},
    );
    // Wait for server to start and print to stdout.
    await p.stdout.first;
  });

  tearDown(() => p.kill());

  test('Increment', () async {
    final response = await post(Uri.parse('$host/'), body: '{"by": 1}');
    expect(response.statusCode, 200);
    expect(response.body, '{"value":1}');
  });

  test('Get', () async {
    final response = await get(Uri.parse('$host/'));
    expect(response.statusCode, 200);
    final resp = json.decode(response.body) as Map;
    expect(resp.containsKey('value'), true);
  });
}