dotnet-testing
Defines .NET test strategy and implementation patterns across xUnit v3 (Facts, Theories, fixtures, IAsyncLifetime), integration testing (WebApplicationFactory, Testcontainers), Aspire testing (DistributedApplicationTestingBuilder), snapshot testing (Verify, scrubbing), Playwright E2E browser automation, BenchmarkDotNet microbenchmarks, code coverage (Coverlet), mutation testing (Stryker.NET), UI testing (page objects, selectors), and AOT WASM test compilation. Spans 13 topic areas. Do not use for production API architecture or CI workflow authoring.
What this skill does
# dotnet-testing ## Overview Testing strategy, frameworks, and quality tooling for .NET applications. This consolidated skill spans 13 topic areas. Load the appropriate companion file from `references/` based on the routing table below. Baseline dependency: `references/testing-strategy.md` defines the unit vs integration vs E2E decision tree and test doubles selection that inform all testing decisions. Load it by default whenever a testing approach needs to be chosen. Most-shared companion: `references/xunit.md` covers xUnit v3 framework features used by integration, snapshot, and UI testing companions. ## Routing Table | Topic | Keywords | Description | Companion File | |-------|----------|-------------|----------------| | Strategy | unit vs integration vs E2E, test doubles | Unit vs integration vs E2E decision tree, test doubles selection | references/testing-strategy.md | | xUnit | Facts, Theories, fixtures, parallelism | xUnit v3 Facts, Theories, fixtures, parallelism, IAsyncLifetime | references/xunit.md | | Integration | WebApplicationFactory, Testcontainers, Aspire | WebApplicationFactory, Testcontainers, Aspire, database fixtures | references/integration-testing.md | | Snapshot | Verify, scrubbing, API responses | Verify library, scrubbing, custom converters, HTTP response snapshots | references/snapshot-testing.md | | Playwright | E2E browser, CI caching, trace viewer | Playwright E2E browser automation, CI caching, trace viewer, codegen | references/playwright.md | | BenchmarkDotNet | microbenchmarks, memory diagnosers | BenchmarkDotNet microbenchmarks, memory diagnosers, baselines | references/benchmarkdotnet.md | | CI benchmarking | threshold alerts, baseline tracking | CI benchmark regression detection, threshold alerts, baseline tracking | references/ci-benchmarking.md | | Test quality | Coverlet, Stryker.NET, flaky tests | Coverlet code coverage, Stryker.NET mutation testing, flaky tests | references/test-quality.md | | Add testing | scaffold xUnit project, coverlet, layout | Scaffold xUnit project, coverlet setup, directory layout | references/add-testing.md | | Slopwatch | LLM reward hacking detection | Slopwatch CLI for LLM reward hacking detection | references/slopwatch.md | | AOT WASM | Blazor/Uno WASM AOT, size, lazy loading | Blazor/Uno WASM AOT compilation, size vs speed, lazy loading, Brotli | references/aot-wasm.md | | UI testing core | page objects, selectors, async waits | Page object model, test selectors, async waits, accessibility testing | references/ui-testing-core.md | | Aspire testing | DistributedApplicationTestingBuilder, Aspire test host | Aspire test host, service HTTP clients, resource health | references/aspire-testing.md | ## Scope - Test strategy and architecture (unit, integration, E2E) - xUnit v3 test authoring - Integration testing (WebApplicationFactory, Testcontainers) - E2E browser testing (Playwright) - Snapshot testing (Verify) - Benchmarking (BenchmarkDotNet, CI gating) - Quality (coverage, mutation testing) - Cross-framework UI testing patterns - Test scaffolding ## Out of scope - UI framework-specific testing (bUnit, Appium) -> [skill:dotnet-ui] - CI/CD pipeline configuration -> [skill:dotnet-devops] - Performance profiling -> [skill:dotnet-tooling]
Related in Design
contribute
IncludedLocal-only OSS contribution command center. Auto-refreshes the user's in-flight PR and issue state on invoke so conversations start with full context — no need to brief Claude on what's in flight. Helps the user find issues to contribute to on GitHub, builds per-repo dossiers of what each upstream expects (CLA, DCO, branch convention, AI policy, draft-first, review bots, issue templates), runs deterministic gates before any external action so AI-assisted contributions don't reach maintainers as slop. State is markdown-only: candidate files at ~/.contribute-system/candidates/, repo dossiers at ~/.contribute-system/research/, append-only event log at ~/.contribute-system/log.jsonl. No database, no cloud calls. Use when the user asks about their PRs / issues / contributions, wants to find new work to take on, claim an issue, build/refresh a repo's dossier, or draft a Design Issue or PR. Trigger with "/contribute", "what's my PR status", "find a contribution", "claim issue X", "draft a Design Issue for Y", "refresh dossier for Z".
architectural-analysis
IncludedUser-triggered deep architectural analysis of a codebase or scoped subtree across eight modes — information architecture, data flow, integration points, UI surfaces, interaction patterns, data model, control flow, and failure modes. This skill should be used when the user asks to "diagram this codebase," "map the architecture," "show the data flow," "give me an ERD," "trace control flow," "find the integration points," "verify the layout pattern," "audit the UX architecture," or any similar request whose primary deliverable is mermaid diagrams plus cited reports under docs/architecture/. Dispatches haiku/sonnet sub-agents in parallel for per-mode exploration, then verifies every citation mechanically before any node lands in a diagram. Not for one-off prose explanations of code (use code-explanation) or for high-level system design from scratch (use system-design).
mcp
IncludedModel Context Protocol (MCP) server development and tool management. Languages: Python, TypeScript. Capabilities: build MCP servers, integrate external APIs, discover/execute MCP tools, manage multi-server configs, design agent-centric tools. Actions: create, build, integrate, discover, execute, configure MCP servers/tools. Keywords: MCP, Model Context Protocol, MCP server, MCP tool, stdio transport, SSE transport, tool discovery, resource provider, prompt template, external API integration, Gemini CLI MCP, Claude MCP, agent tools, tool execution, server config. Use when: building MCP servers, integrating external APIs as MCP tools, discovering available MCP tools, executing MCP capabilities, configuring multi-server setups, designing tools for AI agents.
react-native-skia
IncludedDesign, build, debug, and optimise high-polish animated graphics in React Native or Expo using @shopify/react-native-skia, Reanimated, and Gesture Handler. Use when the user wants canvas-driven UI, shaders, paths, rich text, image filters, sprite fields, Skottie, video frames, snapshots, web CanvasKit setup, or performance tuning for custom motion-heavy elements such as loaders, hero art, cards, charts, progress indicators, particle systems, or gesture-driven surfaces. Also use when the user asks for fluid, glow, glass, blob, parallax, 60fps/120fps, or GPU-friendly animated effects in React Native, even if they do not explicitly say "Skia". Do not use for ordinary form/layout work with standard views.
plaid
IncludedProduct Led AI Development — guides founders from idea to launched product. Six capabilities: Idea (discover a product idea), Validate (pressure-test the idea against fatal flaws, problem reality, competition, and 2-week MVP feasibility), Plan (vision intake + document generation), Design (translate image references into a design.md spec), Launch (go-to-market strategy), and Build (roadmap execution). Use when someone says "PLAID", "plaid idea", "help me find an idea", "product idea", "idea from my business", "idea from my expertise", "plaid validate", "validate my idea", "pressure-test", "is this idea good", "find fatal flaws", "validate the problem", "plan a product", "define my vision", "generate a PRD", "product strategy", "plaid design", "design from image", "translate image to design", "create design.md", "extract design tokens", "plaid launch", "go-to-market", "launch plan", "GTM strategy", "launch playbook", "plaid build", "build the app", "start building", or "execute the roadmap".
nextjs-framer-motion-animations
IncludedAdds production-safe Motion for React or Framer Motion animations to Next.js apps, including reveal, hover and tap micro-interactions, whileInView, stagger, AnimatePresence, layout and layoutId transitions, reorder, scroll-linked UI, and lightweight route-content transitions. Use when the user asks to add, refactor, or debug Motion or Framer Motion in App Router or Pages Router codebases, especially around server/client boundaries, reduced motion, LazyMotion, bundle size, hydration, or route transitions. Avoid for GSAP-style timelines, WebGL or 3D scenes, heavy scroll storytelling, or CSS-only effects unless Motion is explicitly requested.