using System;

using System.Threading.Tasks;

public class Program

{

    public static void Main()

    {

        Console.WriteLine();

​

        var firstTestCase = await HttpTestCaseBuilder

            .TestCase("Create user with invalid password")

            .Arrange(req => req.HttpMethod = HttpMethod.Post)

            .Arrange(req => req.Headers.Authorization = "...")

            .Arrange(req => req.Content = Json.Load(...))

            .ActAsync()

            .Assert(resBody => Assert.NonEmpty(resBody.infos[name=LogToken]));

    }

}

​

public interface IBuilder<T>

{

    T Build();

}

​

​

public interface ITestCaseContext

{

    Task ArrangeAsync();

    Task ActAsync();

    Task AssertAsync();

    Task ThenAsync(Func<Task> fn);

}

​

// .Then(t => t.ArrangeAsync())

public static class ITestCaseContextExtensions

{

    public static async Task<T> ChainArrangeAsync<T>(this T testCaseContext)

        where T : ITestCaseContext

    {

            await testCaseContext.ArrangeAsync();

            return testCaseContext;

    }

​

    T Act();

    T Assert();

    T Then(Func<T> fn);

}

​

public interface IHttpClientTestCaseContext<T> : ITestCaseContext<T>

{

}

​

public class HttpClientTestCaseContext : IHttpClientTestCaseContext<HttpClientTestCaseContext>

{

    public virtual HttpClientTestCaseContext Arrange()

    {

        return this;

    }

    public virtual HttpClientTestCaseContext Act()

    {

        return this;

    }

    public virtual HttpClientTestCaseContext Assert()

    {

        return this;

    }

    public virtual HttpClientTestCaseContext Then(Func<HttpClientTestCaseContext> fn)

    {

        return this;

    }

}

​

​

​

​

​