test(backend): add federation test (#14582)

* test(backend): add federation test

* fix(ci): install pnpm

* fix(ci): cd

* fix(ci): build entire project

* fix(ci): skip frontend build

* fix(ci): pull submodule when checkout

* chore: show log for debugging

* Revert "chore: show log for debugging"

This reverts commit a930964b8d.

* fix(ci): build entire project

* chore: omit unused globals

* refactor: use strictEqual and simplify some asserts

* test: follow requests

* refactor: add resolveRemoteNote function

* refactor: refine resolveRemoteUser function

* refactor: cache admin credentials

* refactor: simplify assertion with excluded fields

* refactor: use assert

* test: note

* chore: labeler detect federation

* test: blocking

* test: move

* fix: use appropriate TLD

* chore: shorter purge interval

* fix(ci): change TLD

* refactor: delete trivial comment

* test(user): isCat

* chore: use jest

* chore: omit logs

* chore: add memo

* fix(ci): omit unnecessary build

* test: pinning Note

* fix: build daemon in container

* style: indent

* test(streaming): timeline

* chore: rename

* fix: delete role after test

* refactor: resolve users by uri

* fix: delete antenna after test

* test: api timeline

* test: Note deletion

* refactor: sleep function

* test: notification

* style: indent

* refactor: type-safe host

* docs: update description

* refactor: resolve function params

* fix(block): wrong test name

* fix: invalid type

* fix: longer timeout for fire testing

* test(timeline): hashtag

* test(note): vote delivery

* fix: wrong description

* fix: hashtag channel param type

* refactor: wrap basic cases

* test(timeline): add homeTimeline tests

* fix(timeline): correct wrong case and description

* test(notification): add tests for Note

* refactor(user): wrap profile consistency with describe

* chore(note): add issue link

* test(timeline): add test

* test(user): suspension

* test: emoji

* refactor: fetch admin first

* perf: faster tests

* test(drive): sensitive flag

* test(emoji): add tests

* chore: ignore .config/docker.env

* chore: hard-coded tester IP address

* test(emoji): custom emoji are surrounded by zero width space

* refactor: client and username as property

* test(notification): mute

* fix(notification): correct description

* test(block): mention

* refactor(emoji): addCustomEmoji function

* fix: typo

* test(note): add reaction tests

* test(timeline): Note deletion

* fix: unnecessary ts-expect-error

* refactor: unnecessary fetch mocking

* chore: add TODO comments

* test(user): deletion

* chore: enable --frozen-lockfile

* fix(ci): copying configs

* docs: update CONTRIBUTING.md

* docs: fix typo

* chore: set default sleep duration

* fix(notification): omit flaky tests

* fix(notification): correct type

* test(notification): add api endpoint tests

* chore: remove redundant mute test

* refactor: use param client

* fix: start timer after trigger

* refactor: remove unnecessary any

* chore: shorter timeout for checking if fired

* fix(block): remove outdated comment

* refactor: shorten remote user variable name

* refactor(block): use existing function

* refactor: file upload

* docs: update description

* test(user): ffVisibility

* fix: `/api/signin` -> `/api/signin-flow`

* test: abuse report

* refactor: use existing type

* refactor: extract duplicate configs to template file

* fix: typo

* fix: avoid conflict

* refactor: change container dependency

* perf: start misskey parallelly

* fix: remove dependency

* chore(backend): add typecheck

* test: add check for #14728

* chore: enable eslint check

* perf: don't start linked services when test

* test(note): remote note deletion for moderation

* chore: define config template

* chore: write setup script

* refactor: omit unnecessary conditional

* refactor: clarify scope

* refactor: omit type assertion

* refactor: omit logs

* style

* refactor: redundant promise

* refactor: unnecessary imports

* refactor: use readable error code

* refactor: cache set in signin function

* refactor: optimize import

CONTRIBUTING.md

@@ -181,31 +181,45 @@ MK_DEV_PREFER=backend pnpm dev
 - HMR may not work in some environments such as Windows.
 
 ## Testing
-- Test codes are located in [`/packages/backend/test`](/packages/backend/test).
-
-### Run test
-Create a config file.
+You can run non-backend tests by executing following commands:
+```sh
+pnpm --filter frontend test
+pnpm --filter misskey-js test
 ```
+
+Backend tests require manual preparation of servers. See the next section for more on this.
+
+### Backend
+There are three types of test codes for the backend:
+- Unit tests: [`/packages/backend/test/unit`](/packages/backend/test/unit)
+- Single-server E2E tests: [`/packages/backend/test/e2e`](/packages/backend/test/e2e)
+- Multiple-server E2E tests: [`/packages/backend/test-federation`](/packages/backend/test-federation)
+
+#### Running Unit Tests or Single-server E2E Tests
+1. Create a config file:
+```sh
 cp .github/misskey/test.yml .config/
 ```
-Prepare DB/Redis for testing.
-```
+
+2. Start DB and Redis servers for testing:
+```sh
 docker compose -f packages/backend/test/compose.yml up
 ```
-Alternatively, prepare an empty (data can be erased) DB and edit `.config/test.yml`.
+Instead, you can prepare an empty (data can be erased) DB and edit `.config/test.yml` appropriately.
 
-Run all test.
+3. Run all tests:
+```sh
+pnpm --filter backend test     # unit tests
+pnpm --filter backend test:e2e # single-server E2E tests
 ```
-pnpm test
+If you want to run a specific test, run as a following command:
+```sh
+pnpm --filter backend test -- packages/backend/test/unit/activitypub.ts
+pnpm --filter backend test:e2e -- packages/backend/test/e2e/nodeinfo.ts
 ```
 
-#### Run specify test
-```
-pnpm jest -- foo.ts
-```
-
-### e2e tests
-TODO
+#### Running Multiple-server E2E Tests
+See [`/packages/backend/test-federation/README.md`](/packages/backend/test-federation/README.md).
 
 ## Environment Variable