# Relay E2e Test > Write and run markdown-driven e2e tests for Relay. Covers fixture format, server/client code patterns, interaction DSL, snapshots, and running tests. Use when this capability is needed. - Skill: `tomevault-io/relay-e2e-test` (Agent Skill, multi-file: 2 files) - Install (CLI): `npx skillmds@latest add tomevault-io/relay-e2e-test` - Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/relay-e2e-test/raw - Safety review: pending (external: skill-scanner PASS, skillspector PASS) - Works with: Claude Code, Claude.ai, OpenAI Codex - Category: Docs & Writing - Author: tomevault-io (https://skillmd.com/u/tomevault-io) - Updated: 2026-09-17 - Page: https://skillmd.com/skills/tomevault-io/relay-e2e-test --- # Relay E2E Tests Markdown-driven end-to-end tests for Relay. Each test is a self-contained `.md` file that defines a GraphQL server (via [Grats](https://grats.capt.dev/)), a Relay-powered React component, and optional interaction steps. The test harness extracts the code blocks, compiles them with Grats + relay-compiler, renders with React Testing Library, runs interactions, and snapshot-tests the output. Tests run against **Relay runtime packages from source**, so changes are reflected immediately without a build step. ## References Read the appropriate reference file based on your task: - **[Writing fixtures](references/writing-fixtures.md)** — fixture format, example, server/client code patterns, interaction DSL, snapshots. Read when creating or modifying test fixtures. - **[Running tests (internal)](references/running-tests-internal.md)** — setup, commands, and compiler resolution for fbsource / OD. Read when running tests internally. - **[Running tests (GitHub)](references/running-tests-github.md)** — setup, commands, and compiler resolution for the OSS repo. Read when running tests on GitHub. --- > Source: [facebook/relay](https://github.com/facebook/relay) — distributed by [TomeVault](https://tomevault.io).