fake-json-server

Guidance for FakeServer and fake JSON API servers for .NET testing. USE FOR: mocking REST APIs during development, creating stub HTTP endpoints for integration tests, simulating third-party API responses, building prototype backends for frontend development, testing HTTP client code without external dependencies. DO NOT USE FOR: production API hosting, load testing (use proper test infrastructure), contract testing (use Pact), or testing real database interactions (use Testcontainers).

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仓库: Tyler-R-Kendrick/agent-skills
最近来源活动: 2026年2月11日 05:14
检测到的 SKILL.md 语言: 英语
星标: 10
分支: 4

安装方式

默认使用会先检查来源的 Prompt；你也可以切换为直接命令，或下载本地副本。

用 Codex 或 Claude 帮你安装复制这段 Prompt，粘贴到 Codex、Claude 或其他助手里，让它检查 Skill 页面并帮你完成安装。

直接命令不会经过审查 Prompt；运行前请先检查来源。

npx skills add https://github.com/Tyler-R-Kendrick/agent-skills --skill fake-json-server

命令会保持在同一行。复制前请横向滚动并检查完整内容。

想先保存到本地？可下载 SkillsMP 当前能够提供的文件。

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SKILL.md

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improve

Use when producing agent/LLM evals, synthetic simulation data, or self-improvement pipelines for prompts, code, skills, agents, harnesses, and workflows. Covers AgentEvals/AgentV, Agent Skills evals, ASSERT, GEPA, Trace, VISTA, Agent Lightning, SkillOpt, Simula-style data design, progressive disclosure, deterministic workspaces, and release evidence. USE FOR: eval creation, EVAL.yaml, AgentEvals, AgentV, evals.json, ASSERT, judge-traces, behavior taxonomy, judges, graders, rubrics, synthetic data, simulation data, Simula, QDC, source-grounded generation, prompt optimization, agent improvement, skill improvement, harness hardening, progressive disclosure, deterministic workflows, GEPA, Trace, VISTA, Agent Lightning, SkillOpt DO NOT USE FOR: ordinary unit/integration tests without AI quality criteria (use testing), refactoring without eval or trace feedback (use refactor), generic Agent Skills packaging without eval or improvement work (use agent-skills)

2026-06-09

Use when working with AI agent protocols, standards, interoperability specifications, evaluation contracts, synthetic simulation data, improvement pipelines, and agent steering workflows. Covers MCP, A2A, ACP, Agent Skills, AGENTS.md, ADL, Improve, x402, AP2, MCP Apps, cagent, and learn. USE FOR: agent protocol selection, comparing MCP vs A2A vs ACP, understanding agent standards ecosystem, choosing payment protocols, choosing eval standards, choosing improvement techniques, choosing synthetic data simulation techniques, steering from user feedback DO NOT USE FOR: specific protocol, eval, or improvement implementation details (use the sub-skills: mcp, a2a, acp, improve, learn, x402, etc.)

2026-06-09

learn

Use when a user corrects, rejects, edits, or redirects an LLM/agent response and the correction should become a reusable reasoning strategy. Converts feedback into generalized learnings for ~/.agents/STEERING.md with linked RDF/Turtle evidence. USE FOR: user corrections, preference feedback, rejected agent behavior, reasoning strategy updates, steering file maintenance DO NOT USE FOR: storing task facts (use memory), ordinary skill authoring (use agent-skills), project instruction files unrelated to feedback (use agents-md)

2026-06-08

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name	fake-json-server
description	Guidance for FakeServer and fake JSON API servers for .NET testing. USE FOR: mocking REST APIs during development, creating stub HTTP endpoints for integration tests, simulating third-party API responses, building prototype backends for frontend development, testing HTTP client code without external dependencies. DO NOT USE FOR: production API hosting, load testing (use proper test infrastructure), contract testing (use Pact), or testing real database interactions (use Testcontainers).
license	MIT
metadata	{"displayName":"Fake JSON Server","author":"Tyler-R-Kendrick","version":"1.0.0"}
compatibility	["claude","copilot","cursor"]
references	[{"title":"Fake JSON Server GitHub Repository","url":"https://github.com/ttu/dotnet-fake-json-server"},{"title":"FakeServer NuGet Package","url":"https://www.nuget.org/packages/FakeServer"}]

Fake JSON Server

Overview

Fake JSON Server provides lightweight, in-process HTTP servers for testing .NET applications that depend on external REST APIs. Instead of calling real third-party services during tests, you create fake endpoints that return predetermined responses. In .NET, this is typically accomplished using , , or custom implementations. These approaches let you test HTTP client code, retry logic, error handling, and response parsing without network dependencies, rate limits, or flaky external services.

using WireMock.Server; using WireMock.RequestBuilders; using WireMock.ResponseBuilders; using System.Net.Http.Json; using Xunit; public class WireMockTests : IAsyncLifetime { private WireMockServer _server = null!; private HttpClient _client = null!; public Task InitializeAsync() { _server = WireMockServer.Start(); _client = new HttpClient { BaseAddress = new Uri(_server.Url!) }; // Stub: GET /api/products returns a list _server .Given(Request.Create() .WithPath("/api/products") .UsingGet()) .RespondWith(Response.Create() .WithStatusCode(200) .WithHeader("Content-Type", "application/json") .WithBodyAsJson(new[] { new { Id = 1, Name = "Widget", Price = 19.99 }, new { Id = 2, Name = "Gadget", Price = 49.99 } })); // Stub: GET /api/products/1 returns a single product _server .Given(Request.Create() .WithPath("/api/products/1") .UsingGet()) .RespondWith(Response.Create() .WithStatusCode(200) .WithBodyAsJson(new { Id = 1, Name = "Widget", Price = 19.99 })); // Stub: simulate a server error _server .Given(Request.Create() .WithPath("/api/products/error") .UsingGet()) .RespondWith(Response.Create() .WithStatusCode(500) .WithBody("Internal Server Error")); return Task.CompletedTask; } [Fact] public async Task GetProducts_Returns_Products() { var products = await _client .GetFromJsonAsync<List<ProductDto>>("/api/products"); Assert.NotNull(products); Assert.Equal(2, products.Count); } [Fact] public async Task ServerError_Is_Handled() { var response = await _client.GetAsync("/api/products/error"); Assert.Equal(System.Net.HttpStatusCode.InternalServerError, response.StatusCode); } public Task DisposeAsync() { _client.Dispose(); _server.Stop(); return Task.CompletedTask; } }

using System.Net; using System.Net.Http.Json; using System.Text.Json; using Xunit; public class FakeHttpHandler : DelegatingHandler { private readonly Dictionary<string, Func<HttpRequestMessage, HttpResponseMessage>> _responses = new(); public FakeHttpHandler Respond( string pathAndMethod, Func<HttpRequestMessage, HttpResponseMessage> handler) { _responses[pathAndMethod] = handler; return this; } protected override Task<HttpResponseMessage> SendAsync( HttpRequestMessage request, CancellationToken cancellationToken) { string key = $"{request.Method} {request.RequestUri?.AbsolutePath}"; if (_responses.TryGetValue(key, out var handler)) return Task.FromResult(handler(request)); return Task.FromResult(new HttpResponseMessage(HttpStatusCode.NotFound)); } } public class HttpClientServiceTests { [Fact] public async Task Service_Parses_Api_Response() { // Arrange var fakeHandler = new FakeHttpHandler() .Respond("GET /api/weather", _ => new HttpResponseMessage { StatusCode = HttpStatusCode.OK, Content = JsonContent.Create(new { City = "Seattle", Temperature = 72, Condition = "Sunny" }) }) .Respond("GET /api/weather/error", _ => new HttpResponseMessage { StatusCode = HttpStatusCode.ServiceUnavailable, Content = new StringContent("Service down") }); var httpClient = new HttpClient(fakeHandler) { BaseAddress = new Uri("https://api.weather.example.com") }; var service = new WeatherService(httpClient); // Act var weather = await service.GetWeatherAsync("Seattle"); // Assert Assert.Equal("Seattle", weather.City); Assert.Equal(72, weather.Temperature); } }

Feature	WebApplicationFactory	WireMock.Net	DelegatingHandler
Server required	In-process	Localhost port	None
Request matching	ASP.NET routing	Flexible matchers	Manual
Delay simulation	Manual middleware	Built-in	Manual
Scenario support	Manual state	Built-in state machine	Manual
Setup complexity	Medium	Low	Low
Best for	Full API fakes	Third-party API mocks	Unit testing HttpClient

fake-json-server

安装方式

检查来源文件

Fake JSON Server

Overview

Fake JSON Server

Overview

WebApplicationFactory for In-Process API Faking

WireMock.Net for HTTP Mocking

Custom DelegatingHandler for HttpClient Mocking

JSON File-Based Data Store

Simulating Delays and Failures

Approach Comparison

Best Practices

fake-json-server

来源信息

安装方式

检查来源文件

同仓库更多 Skills

Fake JSON Server

Overview

同仓库更多 Skills

Fake JSON Server

Overview

WebApplicationFactory for In-Process API Faking

WireMock.Net for HTTP Mocking

Custom DelegatingHandler for HttpClient Mocking

JSON File-Based Data Store

Simulating Delays and Failures

Approach Comparison

Best Practices