Scout API Testing

Core rules (API)

• API specs live in <module-root>/test/scout*/api/{tests,paralleltests}/**/*.spec.ts (examples: test/scout/api/..., test/scoutuiam_local/api/...).
• Use the Scout package that matches the module root:
• src/platform/ or x-pack/platform/ -> @kbn/scout
• x-pack/solutions/observability/** -> @kbn/scout-oblt
• x-pack/solutions/search/** -> @kbn/scout-search
• x-pack/solutions/security/** -> @kbn/scout-security
• Prefer a single top-level apiTest.describe(...) per file and avoid nested describe blocks; multiple top-level describes are supported, but files get hard to read quickly.
• Tags: add { tag: ... } on the suite (or individual tests) so CI/discovery can select the right test target. For solution modules, prefer explicit targets (e.g. [...tags.stateful.classic, ...tags.serverless.observability.complete] in Observability); reserve tags.deploymentAgnostic mainly for platform specs that truly need every deployment-agnostic target (see scout-migrate-from-ftr). Unlike UI tests, API tests don’t currently validate tags at runtime.
• No @ in test titles: Playwright treats @word in test/describe titles as tags. Do not use @ followed by word characters in titles (e.g., @timestamp, @elastic). Rephrase the title instead (e.g., use timestamp field instead of @timestamp).
• If the module provides Scout fixtures, import apiTest from <module-root>/test/scout*/api/fixtures to get module-specific extensions. Importing directly from the module’s Scout package is also fine when you don’t need extensions.
• Browser fixtures are disabled for apiTest (no page, browserAuth, pageObjects).

Imports

• Test framework + tags: import { apiTest, tags } from '@kbn/scout'; (or the module's Scout package, e.g. @kbn/scout-oblt)
• Assertions: import { expect } from '@kbn/scout/api'; (or @kbn/scout-oblt/api, etc.) — not from the main entry
• Types: import type { RoleApiCredentials } from '@kbn/scout';
• expect is not exported from the main @kbn/scout entry. Use the /api subpath for API tests.

Auth: pick based on endpoint

• api/* endpoints: use API keys via requestAuth (getApiKey, getApiKeyForCustomRole).
• internal/* endpoints: use cookies via samlAuth.asInteractiveUser(...).

Recommended test shape

1. Prepare environment (optional): apiServices/kbnClient/esArchiver in beforeAll.
2. Authenticate (least privilege): generate credentials in beforeAll and reuse.
3. Request: call the endpoint with apiClient and the right headers.
4. Assert: verify statusCode and response body; verify side effects via apiServices/kbnClient when needed.

Important: apiServices/kbnClient run with elevated privileges. Don’t use them to validate the endpoint under test (use apiClient + scoped auth).

Header reminders:

• State-changing requests usually need kbn-xsrf.
• Prefer sending x-elastic-internal-origin: kibana for Kibana APIs.
• Include elastic-api-version for versioned public APIs (e.g. '2023-10-31') or internal APIs (e.g. '1').

Assertions

• apiClient methods (get, post, put, delete, patch, head) return { statusCode, body, headers }.
• Use the custom matchers from @kbn/scout/api:

- expect(response).toHaveStatusCode(200) - expect(response).toHaveStatusText('OK') - expect(response).toHaveHeaders({ 'content-type': 'application/json' })

• Standard matchers (toBe, toStrictEqual, toMatchObject, etc.) and asymmetric matchers (expect.objectContaining(...), expect.any(String)) are also available.

API services

• Put reusable server-side helpers behind apiServices (no UI interactions). Use it for setup/teardown and verifying side effects, not for RBAC validation.
• Module-local service: create it under <module-root>/test/scout/api/services/<service>apiservice.ts (or similar). Register it by extending the module's apiServices fixture in <module-root>/test/scout/api/fixtures/index.ts (prefer { scope: 'worker' } when the helper doesn't need per-test state).
• Shared service (reused across modules): consider contributing it to the Scout packages under src/platform/packages/shared/kbn-scout/src/playwright/fixtures/scope/worker/apis/.

Extending fixtures

When tests need custom auth helpers or API services, extend apiTest in the module's fixtures/index.ts:

import { apiTest as base } from '@kbn/scout'; // or the module's Scout package
import type { RequestAuthFixture } from '@kbn/scout';

interface MyApiFixtures {
  requestAuth: RequestAuthFixture & { getMyPluginApiKey: () => Promise<RoleApiCredentials> };
}

export const apiTest = base.extend<MyApiFixtures>({
  requestAuth: async ({ requestAuth }, use) => {
    const getMyPluginApiKey = async () =>
      requestAuth.getApiKeyForCustomRole({
        kibana: [{ base: [], feature: { myPlugin: ['all'] }, spaces: ['*'] }],
      });
    await use({ ...requestAuth, getMyPluginApiKey });
  },
});

Tests then import apiTest from the local fixtures: import { apiTest } from '../fixtures';

Parallelism

• Treat Scout API tests as sequential by default. Parallel API runs require manual isolation (spaces, indices, saved objects) and are uncommon.

Run / debug quickly

• Use either --config or --testFiles (they are mutually exclusive).
• Run by config: node scripts/scout run-tests --arch stateful --domain classic --config <module-root>/test/scout*/api/playwright.config.ts (or .../api/parallel.playwright.config.ts for parallel API runs)
• Run by file/dir (Scout derives the right playwright.config.ts vs parallel.playwright.config.ts): node scripts/scout run-tests --arch stateful --domain classic --testFiles <module-root>/test/scout*/api/tests/my.spec.ts
• For faster iteration, start servers once in another terminal: node scripts/scout start-server --arch stateful --domain classic [--serverConfigSet <configSet>], then run Playwright directly: node scripts/playwright test --config <...> --project local --grep <tag>.
• run-tests auto-detects custom config sets from .../test/scout_<name>/... paths.
• start-server has no Playwright config to inspect, so pass --serverConfigSet <name> when your tests require a custom config set.
• Debug: SCOUTLOGLEVEL=debug

CI enablement

• Scout tests run in CI only for modules listed under plugins.enabled / packages.enabled in .buildkite/scoutciconfig.yml.
• node scripts/scout generate registers the module under enabled so the new configs run in CI.

References

Open only what you need:

• requestAuth vs samlAuth, headers, and least-privilege auth tips: references/scout-api-auth.md
• Creating and registering apiServices helpers (kbnClient + retries + logging): references/scout-api-services.md