如何使用 Behave.NET 编写 .NET 微服务的行为测试？

Feature: 用户注册
  为了创建新用户账户
  系统应接受有效的注册请求
<p>Scenario: 成功注册新用户
Given 系统中不存在邮箱为 "user@example.com" 的用户
When 发送注册请求包含邮箱 "user@example.com" 和密码 "Pass123!"
Then 应返回状态码 201
And 用户应被持久化到数据库</p>

[Binding]
public class RegistrationSteps
{
    private readonly TestContext _context;
<pre class='brush:php;toolbar:false;'>public RegistrationSteps(TestContext context) => _context = context;

[Given(@"系统中不存在邮箱为 ""(.*)"" 的用户")]
public void GivenUserDoesNotExist(string email)
{
    // 清理或验证数据库中无该用户
    _context.UserRepository.DeleteByEmail(email);
}

[When(@"发送注册请求包含邮箱 ""(.*)"" 和密码 ""(.*)""")]
public async Task WhenRegisterRequestSent(string email, string password)
{
    var request = new RegisterCommand(email, password);
    _context.LastResponse = await _context.ApiClient.PostAsync("/api/register", request);
}

[Then(@"应返回状态码 (.*)")]
public void ThenStatusCodeShouldBe(int expectedCode)
{
    _context.LastResponse.StatusCode.Should().Be(expectedCode);
}

[Then(@"用户应被持久化到数据库")]
public void ThenUserShouldBeSaved()
{
    var user = _context.UserRepository.FindByEmail("user@example.com");
    user.Should().NotBeNull();
}

[TestFixture]
public class RunBddTests
{
    [Test]
    public void ExecuteScenarios()
    {
        var executor = new ScenarioExecutor();
        executor.AddStepsAssembly(typeof(RegistrationSteps).Assembly);
        executor.ExecuteInAssembly();
    }
}