Best test data and fixtures skills for Claude Code, Codex and other agents.

Jest patterns for React Native style tests: TDD discipline, mock factory functions, module and GraphQL hook mocking, custom render helpers and anti-patterns to avoid.

ChrisWiles/claude-code-showcase

Creates a Java SDK end-to-end test for the Copilot SDK that runs against a recorded YAML snapshot through a replay proxy, so CI needs no real authentication.

github/copilot-sdk

Stands up a throwaway local SQL Server 2022 backend, applies SQL fixtures and runs Airbyte spec, check, discover and read against source-mssql images.

airbytehq/airbyte

Benchmarks Django ORM filters in Saleor by generating bulk data, extracting the SQL and running EXPLAIN ANALYZE to check index usage.

saleor/saleor

Enforces red-green-refactor for new RTK output filters in Rust, using real captured fixtures, snapshot tests with insta and token-savings assertions.

rtk-ai/rtk

Guides recording, privacy review and offline verification of OpenLogi device fixtures with the fixture contribute and verify commands, without treating replay as proof of hardware behavior.

AprilNEA/OpenLogi

Refreshes stored golden values from a GitHub Actions run, reports signed percentage changes per model, and writes a summary ready for a pull request description.

NVIDIA/Megatron-LM

Stands up a throwaway local MySQL 8.0 backend, applies SQL fixtures and sweeps the Airbyte spec, check, discover and read commands against a source-mysql image.

airbytehq/airbyte

Runs and debugs evaluations of how Chatbox models answer questions about large attached files, using synthetic and real long-document fixtures.

chatboxai/chatbox

Uploads a binary test file to the SimpleITK ExternalData repository by hashing it with SHA-512, staging it in the object store, writing a content-link file and opening a draft PR.

SimpleITK/SimpleITK

Laravel test design and review. An agent skill from anonaddy/anonaddy.

anonaddy/anonaddy

Synthesize training data for ANY tool-use / agentic benchmark, in ANY repo.

sunny-glow/Auto-BenchMax

Starts a local PostgreSQL 16 container, loads SQL fixtures and runs the Airbyte spec, check, discover and read commands against a chosen source-postgres image.

airbytehq/airbyte

Migrate test files from as type assertions to @total-typescript/shoehorn.

fossasia/eventyay-interpretation

Updates EthereumJS execution-spec test fixtures from an ethereum/execution-specs release, then (after a human merge) points the monorepo submodule, updates VM npm scripts, reports a first test run…

ethereumjs/ethereumjs-monorepo

Builds agent evaluations in stages: inspect the repository and traces, agree a Task Spec with you, then build, audit and run a Harbor task with an independent verifier.

langchain-ai/langchain-skills

Create interactive PHP test case scripts for Dolibarr ERP/CRM that allow users to setup test data, view results via direct links, and tear down (clean up) the data.

Dolibarr/dolibarr

Write integration tests using .NET Aspire's testing facilities with xUnit.

DevBetterCom/DevBetterWeb

Reproduces change-data-capture bugs in the source-mssql Airbyte connector by enabling CDC on a local SQL Server backend and replaying per-bug SQL fixtures.

airbytehq/airbyte

Picks the right save file and script for a KenshiCoop debugging or validation session, and protects version-controlled fixtures from being overwritten.

nhoral/KenshiCoop

Manages .NET Docker images including adding images for new .NET versions, new Linux distros (Alpine, Ubuntu, Azure Linux), and new Windows versions.

dotnet/dotnet-docker

Test @data-client/react with renderDataHook and mountDataClient - jest unit tests, fixtures, interceptors, MockResolver, mock responses, nock HTTP mocking, fake timers for polling/subscription…

reactive/data-client

Spins up a persistent OpenWork Cloud Den demo on a Daytona sandbox, seeds it with Acme Robotics data and returns shareable URLs and login details.

different-ai/openwork

Generate synthetic data using sdghub with composable blocks and YAML flows.

Red-Hat-AI-Innovation-Team/sdg_hub

Testing strategies, patterns, and tools for robotics software.

arpitg1304/robotics-agent-skills

Reproduces MySQL binlog change-data-capture behavior for the Airbyte source-mysql connector on a local MySQL backend, with fixtures, a catalog and smoke cases.

airbytehq/airbyte

Create disposable file system test fixtures from objects, templates, or empty directories with automatic cleanup.

privatenumber/fs-fixture

Builds diverse synthetic test inputs for LLM pipeline evaluation by defining failure-focused dimensions, drafting tuples with you and turning them into realistic queries.

ai-evals-course/evals-skills

Interact with Nocturne's local dev-only API: seed a loginable tenant preloaded with realistic sample data, obtain a browser session (loginLink) or bearer token headlessly, export/re-seed the dev…

nightscout/nocturne

Adds tests for the ktnip KSP processor. An agent skill from vendelieu/telegram-bot.

vendelieu/telegram-bot

Audit the current Lynx branch and working tree for test-, fixture-, demo-, page-, domain-, or scenario-tuned production logic.

elliothux/open-compute

Use inside RSIBench-Data when testing whether an automation agent can improve a target model on a configured benchmark through synthetic Tinker SFT data, Tinker sampling, and E2B-based Harbor…

evolvent-ai/RSIBench-Data

Fill test fixtures with the repository fill command. An agent skill from ethereum/execution-specs.

ethereum/execution-specs

Constructs test data against real backends and writes it back into test cases as executable preconditions.

openqa-cn/codexqa

Generate realistic synthetic data using Spark + Faker (strongly recommended).

databricks/databricks-agent-skills

A skill your agent uses when the user wants to set up synthetic data generation for the first time, or when sdghub is not yet installed/configured in the current environment.

Red-Hat-AI-Innovation-Team/sdg_hub

Automatically evaluate and compare multiple AI models or agents without pre-existing test data.

agentscope-ai/OpenJudge

Set up vexana (the dio-based Flutter networking layer) in a Flutter project — adds the dependency, builds one NetworkManager, an optional error model and the test fixture helper, placed in the…

VB10/vexana

Bootstrap a new project from this Forge template end to end, or reset a Forge database into a clean template system.

yaomindong1996/forge-admin

A skill your agent uses when the user needs to design evaluation datasets, create test cases, stratify samples, generate adversarial examples, extract eval dimensions from traces/specs, or build a…

agentscope-ai/OpenJudge

Explains how to run and extend the clickup-cli tests: unit tests with a mocked client, e2e tests against a real ClickUp workspace, and the fixture data they rely on.

krodak/clickup-cli

Use Langfuse's disposable per-PR previews at pr-N.preview.langfuse.com (synthetic data only).

langfuse/langfuse

Testing workflow for the Rstest monorepo. An agent skill from web-infra-dev/rstest.

web-infra-dev/rstest

Test data strategy for the Playwright scaffold — Faker + Zod factories for dynamic happy-path data, static TS files (.ts with as const exports — never .json) for domain-specific curated invalid…

idavidov13/agentic-playwright

Set up test-proxy-recorder for any Playwright project. An agent skill from asmyshlyaev177/test-proxy-recorder.

asmyshlyaev177/test-proxy-recorder

Ensures `.mock-cache` fixture directories under `tests/*` are staged and committed whenever a change adds or modifies a test that uses…

warp-drive-data/warp-drive

Create a new qabot E2E test fixture interactively. An agent skill from shapeshift/web.

shapeshift/web

Generate diverse outputs by prompting for a probability distribution instead of a single response.

gnurio/nurijanian-skills