C#中实现契约测试的方法

[ApiController]
[Route("[controller]/[action]")]
public class MyController : ControllerBase
{
    [HttpGet]
    public int Abs(int i)
    {
        return Math.Abs(i);
    }
}

public class UnitTest1
{
    private readonly IPactBuilderV4 pactBuilder;
    public UnitTest1()
    {
        var pact = Pact.V4("MyAPI consumer", "MyAPI",new PactConfig());
        this.pactBuilder = pact.WithHttpInteractions();
    }
    [Fact]
    public async Task Test1()
    {
        this.pactBuilder.UponReceiving("A request to calc Abs")
            .Given("Abs")
            .WithRequest(HttpMethod.Get, "/My/Abs")
            .WithQuery("i","-2")//Match.Integer(-2) 
            .WillRespond()
            .WithStatus(HttpStatusCode.OK)
            .WithJsonBody(2);
        await this.pactBuilder.VerifyAsync(async ctx=>
        {
            using HttpClient httpClient = new HttpClient();
            httpClient.BaseAddress = ctx.MockServerUri;
            var r = await httpClient.GetFromJsonAsync<int>($"/My/Abs?i=-2");
            Assert.Equal(2,r);
        });
    }
}

public class MyApiFixture: IDisposable
{
    private readonly IHost server;
    public Uri ServerUri { get; }
    public MyApiFixture()
    {
        ServerUri = new Uri("http://localhost:9223");
        server = Host.CreateDefaultBuilder()
            .ConfigureWebHostDefaults(webBuilder =>
            {
                webBuilder.UseUrls(ServerUri.ToString());
                webBuilder.UseStartup<Startup>();
            })
            .Build();
        server.Start();
    }
    public void Dispose()
    {
        server.Dispose();
    }
}

public class MyApiTest1: IClassFixture<MyApiFixture>
{
    private readonly MyApiFixture fixture;
    private readonly ITestOutputHelper output;
    public MyApiTest1(MyApiFixture fixture,ITestOutputHelper output)
    {
        this.fixture = fixture;
        this.output = output;
    }
    [Fact]
    public async Task Test1()
    {
        var config = new PactVerifierConfig
        {
            Outputters = new List<IOutput>
            {
                new XunitOutput(output),
            },
        };
        string pactPath = Path.Combine("..","..","..","..",
            "TestConsumerProject1", "pacts", "MyAPI consumer-MyAPI.json");
        using var pactVerifier = new PactVerifier("MyAPI", config);
        pactVerifier
            .WithHttpEndpoint(fixture.ServerUri)
            .WithFileSource(new FileInfo(pactPath))
            .Verify();
    }
}