n8n-io/n8n

Unit/integration tests are Vitest, orchestrated by a workspace glob over every package's vitest.config; packages/cli alone has ~286 integration test files plus unit/migration suites runnable against SQLite or Postgres (incl. testcontainers). nodes-base tests live per-node and via JSON workflow harnesses. Playwright covers e2e UI, API, container, performance and benchmark projects under packages/testing/playwright. CI (ci-master.yml) builds, unit-tests on Node 24/26, lints, runs CodSpeed benchmarks, and verifies single-instance npm packaging; Stryker mutation testing is wired via the 'mutate' script.

• Vitest workspace at repo root collects every packages/**/vitest.config.*; ~6368 *.test.ts files exist across the repo.
  vitest.workspace.ts
• packages/cli test scripts run vitest with DB_TYPE=sqlite by default; separate configs (vitest.config.integration.ts, vitest.config.migration.ts, *.testcontainers.ts) target integration and migration suites; test:postgres variants set DB_TYPE=postgresdb.
  packages/cli/package.json#L27-47packages/cli/test/integration
• Test layout in packages/cli/test: unit/, integration/, migration/, shared/, plus global-setup.ts and setup-testcontainers.ts helpers.
  packages/cli/test/global-setup.tspackages/cli/test/setup-testcontainers.ts
• nodes-base keeps per-node tests in <Node>/test/ or __tests__ dirs plus a top-level test/ folder with JSON workflow harness tests (NodeTestHarness) and nock-based HTTP mocking.
  packages/nodes-base/testpackages/nodes-base/nodes/Webhook/test/description.test.tspackages/nodes-base/AGENTS.md
• Playwright suite lives in packages/testing/playwright with playwright.config.ts + playwright-projects.ts; tests/e2e, tests/framework, infrastructure/benchmark and performance projects; currents.config.ts indicates Currents reporting.
  packages/testing/playwright/playwright.config.tspackages/testing/playwright/tests/e2epackages/testing/playwright/currents.config.ts
• CI on master (ci-master.yml): build-github job, unit-test reusable workflow on Node 24.18.1 and 26.5.1 with coverage on 24, lint reusable workflow, CodSpeed performance benchmarks post-merge, and verify-single-instance-npm packaging check.
  .github/workflows/ci-master.yml
• Mutation testing is available via Stryker: @stryker-mutator/core + vitest-runner in devDeps and 'pnpm mutate'/'mutate:diff' scripts.
  package.json#L71-72package.json#L101-102
• Core engine has dedicated unit tests: workflow-execute.test.ts, routing-node.test.ts, active-workflow-triggers.test.ts under packages/core/src/execution-engine/__tests__.
  packages/core/src/execution-engine/__tests__/workflow-execute.test.ts
• Encryption upgrades/rotations have dedicated Playwright suites exposed via root scripts test:encryption:upgrade and test:encryption:rotation.
  package.json#L82-83
• Coverage is collected through @vitest/coverage-v8 and codecov.yml; Codecov token is threaded through ci-master build env.
  packages/cli/package.json#L125codecov.yml.github/workflows/ci-master.yml