Testing
Unit tests, integration tests, test automation
e2e-test-create
by metabase
Analyze React component source code to understand UI structure, then generate idiomatic Cypress E2E tests following Metabase conventions. Falls back to Playwright MCP browser exploration only when code reading and screenshot debugging are insufficient.
e2e-test
by metabase
Run Cypress E2E tests, analyze failures including screenshots, and stress test for flakiness
e2e-test-review
by metabase
Review Cypress E2E spec files for Metabase conventions, common gotchas, and flakiness/performance issues. Use when reviewing pull requests or diffs containing Cypress spec files in e2e/test/scenarios/.
sessions
by microsoft
Core principles and workflow router for changes to the Agents Window under src/vs/sessions.
customizations-in-the-agent-host
by microsoft
Architecture and hard-won debugging lessons for customization enablement (plugins, MCP servers, agents, skills, instructions) in the agent host. Use when changing how customizations are discovered, published, enabled/disabled, or handed to a provider SDK; when a customization shows the wrong enabled state in the UI; or when a disabled MCP server or plugin is still reaching the model.
github-copilot-upgrader
by microsoft
Use this to update the Github Copilot CLI/SDK
smoke-tests
by microsoft
Use when running VS Code smoke tests or working on smoke-test CI steps. Covers npm run smoketest / smoketest-no-compile, grep filtering tests, and a temporary repeat-loop technique for tracking down flaky smoke tests in CI.
chat-customizations-editor
by microsoft
Use when working on the Chat Customizations editor — the management UI for agents, skills, instructions, hooks, prompts, MCP servers, and plugins.
unit-tests
by microsoft
Use when running unit tests in the VS Code repo. Covers the runTests tool, scripts/test.sh (macOS/Linux) and scripts/test.bat (Windows), and their supported arguments for filtering, globbing, and debugging tests.
agent-host-e2e-tests
by microsoft
Use when writing, recording, updating, or troubleshooting the agent host end-to-end tests under src/vs/platform/agentHost/test/node/e2e (black-box tests that drive the whole agent host over the AHP protocol, using a CapiReplayProxy record/replay system for Claude/Copilot/Codex). Covers adding a cross-provider test, re-recording fixtures after an SDK bump, gating non-deterministic or platform-specific tests, and diagnosing replay cache misses.
integration-tests
by microsoft
Use when running integration tests in the VS Code repo. Covers scripts/test-integration.sh (macOS/Linux) and scripts/test-integration.bat (Windows), their supported arguments for filtering, and the difference between node.js integration tests and extension host tests.
integrated-browser
by microsoft
Use this when working on the VS Code integrated browser ("browserView") to understand its architecture and mental model. Covers the embedded Chromium browser, its editor tab, navigation, overlay/layout, sessions, and agent browser tools under src/vs/platform/browserView and src/vs/workbench/contrib/browserView.
feature-flags
by facebook
Use when feature flag tests fail, flags need updating, understanding @gate pragmas, debugging channel-specific test failures, or adding new flags to React.
playwright-mcp-metabase
by metabase
Drive Metabase's UI with the Playwright MCP browser tools (mcp__playwright__browser_*). Covers the snapshot/act/check pattern, Mantine component pitfalls (Menu race, Select/MultiSelect, the Escape-closes-modal trap, portal scoping), and Metabase-specific login flows. Use whenever a session needs to interact with the Metabase UI through Playwright MCP.
mutation-testing
by metabase
Run mutation testing on a Clojure namespace, generate tests to kill surviving mutations, and open draft PRs with Linear issue tracking.
tuist-swift-review
by tuist
Project-specific pull request review rules for the tuist/tuist Swift codebases. Focuses on the things only this repo knows, including preferring value types, the testing framework choice, and migration of XCTest to Swift Testing.
test
by facebook
Use when you need to run tests for React core. Supports source, www, stable, and experimental channels.
extending-personhog-test-harness
by PostHog
When and how to add scenarios, chaos events, and invariants to the personhog e2e test harness (rust/personhog-test-harness). Use after fixing a bug or regression in the personhog leader path (leader, router, writer, replica, coordination protocol) so the fix gets a permanent regression scenario; when adding a new failure mode to test (crashes, drains, zombies, lag, failover); or when a new correctness property needs asserting during runs. Trigger terms: personhog gate, chaos scenario, test harness, leader path regression, handoff bug, eviction, writer lag, acked write.
authoring-ci-workflows
by PostHog
Use when adding or editing a GitHub Actions workflow, composite action, or reusable workflow under .github/ — new CI jobs, triggers, matrices, checkout/clone tuning, action pinning, GitHub App token auth, concurrency groups, timeout-minutes, paths filters, caching, or runner choice. Covers PostHog's workflow-authoring conventions and the reasons behind them: the 500-runs/10s dispatch cap, shallow vs full clone, per-SHA push concurrency, dedicated App-token rate-limit buckets, and fork-safe secrets on a public repo. Points to the linters (bin/hogli lint:workflows, actionlint) that enforce the mechanical rules, and to the narrower skills for production deploys, secrets, and Depot runners. Not for debugging red CI (use debugging-ci-failures) or wiring a new secret end to end (use managing-github-actions-secrets).
playwright-test
by PostHog
Write a playwright test, make sure it runs, and is not flaky.
posthog-desktop
by PostHog
Scopes work to the desktop app at products/desktop — a nested standalone pnpm/turbo/Biome workspace imported from the now-archived PostHog/code repo, with posthog/posthog the only source of truth for PRs, CI and publishing, and not part of the root frontend or Django build. Use when the user says /posthog-desktop, or works on the Electron desktop app, apps/code, apps/web, apps/mobile, packages/core, packages/ui, packages/workspace-server, @posthog/api-client, @posthog/agent, or the agent framework. Pins the working directory to products/desktop, swaps in that tree's toolchain and conventions in place of the monorepo's, and defines the few paths outside the tree that may be touched (Django APIs the app calls, desktop-* CI at the root).
setting-feature-flags-in-storybook
by PostHog
'Use when writing a Storybook story for a component gated on a feature flag — boolean flags or multivariate/experiment-arm variants. Covers the featureFlags story parameter and why imperatively setting flags renders the flag-off branch in visual-regression snapshots while passing in jest.'
testing
by lobehub
'Vitest testing guide. Use when writing or updating tests, fixing failing tests, improving coverage, debugging test issues, or setting up mocks.'
maintaining-python-tests
by PostHog
Maintains existing pytest and Django test suites without weakening correctness. Use when asked to reduce Python test runtime or CI work, investigate slow pytest families, remove stale migration tests, consolidate repeated setup, improve Python test ownership, or measure whether a test optimization worked after merge. Ranks work by measured cost, applies the writing-tests value gate to existing coverage, preserves distinct behavior cases, validates isolation after shared-fixture changes, and separates testcase work from pytest-suite wall time. For an intermittent failure, use fixing-flaky-tests instead.