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blog.pyaqa.ru/tests/FEATURE_INFRASTRUCTURE.md
Sergey Vanyushkin d32ad29abc
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feat(i18n): add browser-language localization with Jinja2 _() and locale middleware 
Add i18n support to the blog web UI with 4 languages (en/ru/fr/de),
80 translation keys, automatic Accept-Language detection, persistent
locale cookie, and a language switcher dropdown in the header.

- Infrastructure: TranslationService, translation dicts, convenience _()
- Presentation: locale middleware, /web/lang/{locale} switcher route
- Templates: all 9 templates use {{ _(key, current_locale) }}
- Tests: 26 tests across TranslationService, locale detection helpers
- Docs: TEST_MODEL.md and FEATURE_INFRASTRUCTURE.md updated with TC-UNIT-811-821
2026-05-10 16:22:06 +03:00

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# Test Model: Infrastructure & Bootstrap
Feature: Application initialization, configuration, authentication client,
and transaction management. These tests validate the plumbing layer that
supports the domain and application layers.
## Unit Test Cases
### App Bootstrap
#### TC-UNIT-501: Lifespan — Init and Close
- **Type:** Positive
- **Layer:** Unit
- **File:** `unit/test_main.py::test_lifespan`
- **Preconditions:** Mock `init_db` and `close_db`
- **Steps:** Enter and exit lifespan context manager
- **Expected:**
- `init_db` called once on enter
- `close_db` called once on exit
- `close_db` not called during context
- **Last Verified:** 2026-05-07
#### TC-UNIT-502: App Factory — Creates FastAPI App
- **Type:** Positive
- **Layer:** Unit
- **File:** `unit/test_main.py::test_app_factory`
- **Expected:** Returns `FastAPI` instance
- **Last Verified:** 2026-05-07
#### TC-UNIT-503: App Factory — Has Routes
- **Type:** Positive
- **Layer:** Unit
- **File:** `unit/test_main.py::test_app_factory_has_routes`
- **Expected:** `/health` route exists; API routes registered
- **Last Verified:** 2026-05-07
#### TC-UNIT-504: Main — Starts Uvicorn
- **Type:** Positive
- **Layer:** Unit
- **File:** `unit/test_main.py::test_main`
- **Preconditions:** Mock `uvicorn.run`
- **Expected:**
- `uvicorn.run` called with `factory=True`
- `host="0.0.0.0"`, `port=8000`
- **Last Verified:** 2026-05-07
### Configuration
#### TC-UNIT-601: Settings — Default Values
- **Type:** Positive
- **Layer:** Unit
- **File:** `unit/infrastructure/test_config.py::TestSettings::test_default_values`
- **Expected:**
- `app.name == "Blog API"`
- `app.debug is False`
- `database_url == "sqlite+aiosqlite:///./blog.db"` (dev default)
- `environment == Environment.DEV`
- **Last Verified:** 2026-05-07
#### TC-UNIT-602: Settings — Custom Values
- **Type:** Positive
- **Layer:** Unit
- **File:** `unit/infrastructure/test_config.py::TestSettings::test_custom_values`
- **Expected:** Custom app, db, and env values applied correctly
- **Last Verified:** 2026-05-07
#### TC-UNIT-603: Settings — is_dev / is_prod Properties
- **Type:** Positive
- **Layer:** Unit
- **File:** `unit/infrastructure/test_config.py::TestSettings::test_is_dev_property`, `test_is_prod_property`
- **Expected:** Boolean properties match environment enum
- **Last Verified:** 2026-05-07
#### TC-UNIT-604: Settings — Prod Requires Security Secret
- **Type:** Negative
- **Layer:** Unit
- **File:** `unit/infrastructure/test_config.py::TestSettings::test_prod_requires_security_secret`
- **Expected:** Raises `ValueError` with `SECURITY_SECRET_KEY` when secret is empty in prod
- **Last Verified:** 2026-05-07
#### TC-UNIT-605: Settings — Prod Requires KC Secret
- **Type:** Negative
- **Layer:** Unit
- **File:** `unit/infrastructure/test_config.py::TestSettings::test_prod_requires_kc_secret`
- **Expected:** Raises `ValueError` with `KC_CLIENT_SECRET` when KC secret is empty in prod
- **Last Verified:** 2026-05-07
#### TC-UNIT-606: Settings — Database URL Dev Default
- **Type:** Positive
- **Layer:** Unit
- **File:** `unit/infrastructure/test_config.py::TestSettings::test_database_url_dev_default`
- **Expected:** Dev mode defaults to SQLite async URL
- **Last Verified:** 2026-05-07
#### TC-UNIT-607: Settings — Database URL Prod Builds Postgres
- **Type:** Positive
- **Layer:** Unit
- **File:** `unit/infrastructure/test_config.py::TestSettings::test_database_url_prod_builds_postgres`
- **Expected:** When `db.url` is None in prod, URL built from host/port/user/password/name
- **Last Verified:** 2026-05-07
#### TC-UNIT-608: Settings — Database URL Override
- **Type:** Positive
- **Layer:** Unit
- **File:** `unit/infrastructure/test_config.py::TestSettings::test_database_url_override`
- **Expected:** Explicit `db.url` overrides auto-building in prod
- **Last Verified:** 2026-05-07
#### TC-UNIT-609: AppConfig — Defaults
- **Type:** Positive
- **Layer:** Unit
- **File:** `unit/infrastructure/test_config.py::TestAppConfig::test_default_values`
- **Expected:** Default name, debug, host, port values
- **Last Verified:** 2026-05-07
#### TC-UNIT-610: DBConfig — Defaults
- **Type:** Positive
- **Layer:** Unit
- **File:** `unit/infrastructure/test_config.py::TestDBConfig::test_default_values`
- **Expected:** Default PostgreSQL connection params
- **Last Verified:** 2026-05-07
#### TC-UNIT-611: DBConfig — URL Validation (Postgres)
- **Type:** Positive
- **Layer:** Unit
- **File:** `unit/infrastructure/test_config.py::TestDBConfig::test_postgres_url_validation`
- **Expected:** Postgres URL accepted
- **Last Verified:** 2026-05-07
#### TC-UNIT-612: DBConfig — URL Validation (SQLite)
- **Type:** Positive
- **Layer:** Unit
- **File:** `unit/infrastructure/test_config.py::TestDBConfig::test_sqlite_url_validation`
- **Expected:** SQLite URL accepted
- **Last Verified:** 2026-05-07
#### TC-UNIT-613: DBConfig — URL Validation Rejects Invalid
- **Type:** Negative
- **Layer:** Unit
- **File:** `unit/infrastructure/test_config.py::TestDBConfig::test_invalid_url_validation`
- **Expected:** Raises `ValueError` for non-SQLite/non-Postgres URLs
- **Last Verified:** 2026-05-07
#### TC-UNIT-614: KCConfig — Defaults
- **Type:** Positive
- **Layer:** Unit
- **File:** `unit/infrastructure/test_config.py::TestKCConfig::test_default_values`
- **Expected:** Default Keycloak server, realm, client settings
- **Last Verified:** 2026-05-07
#### TC-UNIT-615: KCConfig — is_configured With Secret
- **Type:** Positive
- **Layer:** Unit
- **File:** `unit/infrastructure/test_config.py::TestKCConfig::test_is_configured_with_secret`
- **Expected:** `is_configured is True` when `client_secret` is set
- **Last Verified:** 2026-05-07
#### TC-UNIT-616: KCConfig — is_configured Without Secret
- **Type:** Positive
- **Layer:** Unit
- **File:** `unit/infrastructure/test_config.py::TestKCConfig::test_is_configured_without_secret`
- **Expected:** `is_configured is False` when `client_secret` is empty
- **Last Verified:** 2026-05-07
#### TC-UNIT-617: SecurityConfig — Defaults
- **Type:** Positive
- **Layer:** Unit
- **File:** `unit/infrastructure/test_config.py::TestSecurityConfig::test_default_values`
- **Expected:** Default token expiration (30 min)
- **Last Verified:** 2026-05-07
#### TC-UNIT-618: SecurityConfig — is_configured
- **Type:** Positive
- **Layer:** Unit
- **File:** `unit/infrastructure/test_config.py::TestSecurityConfig::test_is_configured_with_secret`, `test_is_configured_without_secret`
- **Expected:** `is_configured` reflects secret presence
- **Last Verified:** 2026-05-07
#### TC-UNIT-619: Environment Enum — Values
- **Type:** Positive
- **Layer:** Unit
- **File:** `unit/infrastructure/test_config.py::TestEnvironment::test_dev_value`, `test_prod_value`
- **Expected:** `DEV.value == "dev"`, `PROD.value == "prod"`
- **Last Verified:** 2026-05-07
### Authentication Client
#### TC-UNIT-701: TokenInfo — Valid Token
- **Type:** Positive
- **Layer:** Unit
- **File:** `unit/infrastructure/test_auth.py::TestTokenInfo::test_token_info_valid`
- **Expected:** `is_valid is True`, all fields populated
- **Last Verified:** 2026-05-07
#### TC-UNIT-702: TokenInfo — Inactive Token
- **Type:** Negative
- **Layer:** Unit
- **File:** `unit/infrastructure/test_auth.py::TestTokenInfo::test_token_info_invalid_not_active`
- **Expected:** `is_valid is False`
- **Last Verified:** 2026-05-07
#### TC-UNIT-703: TokenInfo — Missing user_id
- **Type:** Negative
- **Layer:** Unit
- **File:** `unit/infrastructure/test_auth.py::TestTokenInfo::test_token_info_invalid_no_user_id`
- **Expected:** `is_valid is False`
- **Last Verified:** 2026-05-07
#### TC-UNIT-704: TokenInfo — Empty Roles
- **Type:** Edge
- **Layer:** Unit
- **File:** `unit/infrastructure/test_auth.py::TestTokenInfo::test_token_info_empty_roles`
- **Expected:** `is_valid is True`, roles is empty list
- **Last Verified:** 2026-05-07
#### TC-UNIT-705: KeycloakUser — Creation
- **Type:** Positive
- **Layer:** Unit
- **File:** `unit/infrastructure/test_auth.py::TestKeycloakUser::test_keycloak_user_creation`
- **Expected:** All fields stored correctly
- **Last Verified:** 2026-05-07
#### TC-UNIT-706: KeycloakUser — Defaults
- **Type:** Positive
- **Layer:** Unit
- **File:** `unit/infrastructure/test_auth.py::TestKeycloakUser::test_keycloak_user_defaults`
- **Expected:** Optional fields default to empty strings / lists
- **Last Verified:** 2026-05-07
#### TC-UNIT-707: KeycloakAuthClient — Initialization
- **Type:** Positive
- **Layer:** Unit
- **File:** `unit/infrastructure/test_auth.py::TestKeycloakAuthClient::test_client_initialization`
- **Expected:** Base URL and credentials set from settings
- **Last Verified:** 2026-05-07
#### TC-UNIT-708: KeycloakAuthClient — Introspection URL
- **Type:** Positive
- **Layer:** Unit
- **File:** `unit/infrastructure/test_auth.py::TestKeycloakAuthClient::test_get_introspection_url`
- **Expected:** URL built from settings (server_url, realm)
- **Last Verified:** 2026-05-07
#### TC-UNIT-709: KeycloakAuthClient — Userinfo URL
- **Type:** Positive
- **Layer:** Unit
- **File:** `unit/infrastructure/test_auth.py::TestKeycloakAuthClient::test_get_userinfo_url`
- **Expected:** URL built from settings
- **Last Verified:** 2026-05-07
#### TC-UNIT-710: KeycloakAuthClient — Introspect Success
- **Type:** Positive
- **Layer:** Unit
- **File:** `unit/infrastructure/test_auth.py::TestKeycloakAuthClient::test_introspect_token_success`
- **Preconditions:** Mock `httpx.AsyncClient` with active token response
- **Expected:** Returns `TokenInfo` with active=True, roles parsed from realm_access
- **Last Verified:** 2026-05-07
#### TC-UNIT-711: KeycloakAuthClient — Introspect Inactive Token
- **Type:** Negative
- **Layer:** Unit
- **File:** `unit/infrastructure/test_auth.py::TestKeycloakAuthClient::test_introspect_token_inactive`
- **Expected:** Returns `TokenInfo` with active=False, is_valid=False
- **Last Verified:** 2026-05-07
#### TC-UNIT-712: KeycloakAuthClient — Introspect HTTP Error
- **Type:** Negative
- **Layer:** Unit
- **File:** `unit/infrastructure/test_auth.py::TestKeycloakAuthClient::test_introspect_token_http_error`
- **Expected:** Returns inactive `TokenInfo` (graceful degradation)
- **Last Verified:** 2026-05-07
#### TC-UNIT-713: KeycloakAuthClient — Introspect Uses Cache
- **Type:** Positive
- **Layer:** Unit
- **File:** `unit/infrastructure/test_auth.py::TestKeycloakAuthClient::test_introspect_token_uses_cache`
- **Expected:** Second call with same token uses cache; HTTP client called only once
- **Last Verified:** 2026-05-07
#### TC-UNIT-714: KeycloakAuthClient — Get Userinfo Success
- **Type:** Positive
- **Layer:** Unit
- **File:** `unit/infrastructure/test_auth.py::TestKeycloakAuthClient::test_get_userinfo_success`
- **Expected:** Returns `KeycloakUser` with all profile fields
- **Last Verified:** 2026-05-07
#### TC-UNIT-715: KeycloakAuthClient — Get Userinfo Error
- **Type:** Negative
- **Layer:** Unit
- **File:** `unit/infrastructure/test_auth.py::TestKeycloakAuthClient::test_get_userinfo_error`
- **Expected:** Returns `None` on HTTP error
- **Last Verified:** 2026-05-07
#### TC-UNIT-716: KeycloakAuthClient — Introspect Without Realm Roles
- **Type:** Edge
- **Layer:** Unit
- **File:** `unit/infrastructure/test_auth.py::TestKeycloakAuthClient::test_introspect_token_no_realm_roles`
- **Expected:** Returns active token with empty roles list
- **Last Verified:** 2026-05-07
### Transaction Manager
#### TC-UNIT-801: SessionTransactionManager — Commit
- **Type:** Positive
- **Layer:** Unit
- **File:** `unit/infrastructure/test_transaction_manager.py::TestSessionTransactionManager::test_commit`
- **Expected:** Calls `session.commit` once
- **Last Verified:** 2026-05-07
#### TC-UNIT-802: SessionTransactionManager — Rollback
- **Type:** Positive
- **Layer:** Unit
- **File:** `unit/infrastructure/test_transaction_manager.py::TestSessionTransactionManager::test_rollback`
- **Expected:** Calls `session.rollback` once
- **Last Verified:** 2026-05-07
### i18n Localization
#### Translation Service
##### TC-UNIT-811: TranslationService — Existing key returns translation
- **Type:** Positive
- **Layer:** Unit
- **File:** `unit/infrastructure/test_i18n.py::TestTranslationService::test_get_text_returns_translation_for_existing_key`
- **Expected:** Returns correct localized string when key exists in requested locale
- **Last Verified:** 2026-05-10
##### TC-UNIT-812: TranslationService — Fallback chain
- **Type:** Positive
- **Layer:** Unit
- **File:** `unit/infrastructure/test_i18n.py::TestTranslationService::{test_get_text_returns_english_fallback_for_missing_key, test_get_text_returns_key_when_neither_locale_nor_en_has_it, test_get_text_returns_english_fallback_for_unknown_locale}`
- **Preconditions:** Key missing in requested locale
- **Steps:** Call get_text with partially-available keys
- **Expected:**
- Falls back to English when key exists in `en` but not in requested locale
- Falls back to raw key when neither requested locale nor `en` has it
- Falls back to English when locale is completely unknown
- **Last Verified:** 2026-05-10
##### TC-UNIT-813: TranslationService — English locale
- **Type:** Positive
- **Layer:** Unit
- **File:** `unit/infrastructure/test_i18n.py::TestTranslationService::test_get_text_returns_en_when_requested_locale_is_en`
- **Expected:** Returns English string when locale is explicitly `en`
- **Last Verified:** 2026-05-10
##### TC-UNIT-814: TranslationService — Singleton pattern
- **Type:** Positive
- **Layer:** Unit
- **File:** `unit/infrastructure/test_i18n.py::TestTranslationService::{test_singleton_returns_same_instance, test_singleton_shares_translations}`
- **Expected:** Multiple calls to `get_instance()` return the same object with shared data
- **Last Verified:** 2026-05-10
#### Convenience Function
##### TC-UNIT-815: Convenience _() function
- **Type:** Positive
- **Layer:** Unit
- **File:** `unit/infrastructure/test_i18n.py::TestConvenienceFunction::{test_convenience_function_returns_translation, test_convenience_function_defaults_to_english, test_convenience_function_returns_key_on_missing}`
- **Expected:**
- Returns translation when key and locale are given
- Defaults to `DEFAULT_LOCALE` ("en") when locale omitted
- Returns raw key when no translation exists
- **Last Verified:** 2026-05-10
#### Locale Detection
##### TC-UNIT-816: Parse Accept-Language — Empty and single locale
- **Type:** Positive
- **Layer:** Unit
- **File:** `unit/infrastructure/test_i18n.py::TestParseAcceptLanguage::{test_empty_header_returns_empty_list, test_single_locale}`
- **Expected:**
- Empty header returns empty list
- Single locale returns single-element list
- **Last Verified:** 2026-05-10
##### TC-UNIT-817: Parse Accept-Language — Multi-locale with quality
- **Type:** Positive
- **Layer:** Unit
- **File:** `unit/infrastructure/test_i18n.py::TestParseAcceptLanguage::test_multiple_locales_with_quality`
- **Expected:** Locales sorted by descending q-value, quality values stripped
- **Last Verified:** 2026-05-10
##### TC-UNIT-818: Parse Accept-Language — Region codes and complex input
- **Type:** Positive
- **Layer:** Unit
- **File:** `unit/infrastructure/test_i18n.py::TestParseAcceptLanguage::{test_region_code_strips_to_base_language, test_complex_header, test_whitespace_around_locales}`
- **Expected:**
- `fr-FR` normalised to `fr`
- Realistic headers with region codes parsed correctly
- Whitespace around locale codes handled gracefully
- **Last Verified:** 2026-05-10
##### TC-UNIT-819: Get best locale — Cookie priority
- **Type:** Positive
- **Layer:** Unit
- **File:** `unit/infrastructure/test_i18n.py::TestGetBestLocale::{test_cookie_takes_priority, test_invalid_cookie_falls_back_to_header}`
- **Expected:**
- Cookie value used when it is a supported locale
- Unsupported locale in cookie falls back to Accept-Language header
- **Last Verified:** 2026-05-10
##### TC-UNIT-820: Get best locale — Header fallback
- **Type:** Positive
- **Layer:** Unit
- **File:** `unit/infrastructure/test_i18n.py::TestGetBestLocale::{test_no_cookie_uses_accept_language, test_no_cookie_no_header_returns_default, test_accept_language_unsupported_returns_default, test_missing_cookie_key_uses_header}`
- **Expected:**
- Accept-Language used when no cookie present
- Default locale returned when neither cookie nor header matches
- Unsupported language in header falls back to default
- Absent `locale` cookie key treated as no preference
- **Last Verified:** 2026-05-10
##### TC-UNIT-821: Setup locale manager — Middleware helper
- **Type:** Positive
- **Layer:** Unit
- **File:** `unit/infrastructure/test_i18n.py::TestSetupLocaleManager::{test_sets_locale_on_request_state, test_does_not_override_existing_locale, test_default_locale_when_no_match}`
- **Expected:**
- Sets `request.state.locale` from best-match locale
- Does not override an already-set locale
- Falls back to default when nothing matches
- **Last Verified:** 2026-05-10
## Coverage Summary
| Component | Cases | Status |
|-----------|-------|--------|
| App Bootstrap | 4 | ✅ Lifespan, factory, routes, main entry |
| Settings & Config | 19 | ✅ Defaults, overrides, validation, env checks |
| Keycloak Auth Client | 16 | ✅ Token introspection, userinfo, caching, errors |
| Transaction Manager | 2 | ⚠️ Only commit/rollback; missing nested tx, error handling |
| i18n Localization | 11 | ✅ Translation service, locale detection, middleware helper |
## Gaps (Not Yet Covered)
- [ ] TC-UNIT-803: Transaction Manager — rollback on exception
- [ ] TC-UNIT-804: Transaction Manager — nested transaction behavior
- [ ] TC-UNIT-805: KeycloakAuthClient — cache expiration (TTL)
- [ ] TC-UNIT-806: KeycloakAuthClient — cache key isolation per token
- [ ] TC-UNIT-807: Settings — prod database URL building with missing components
- [ ] TC-UNIT-808: App Factory — CORS middleware configuration
- [ ] TC-UNIT-809: App Factory — static files mounting
- [ ] TC-UNIT-810: App Factory — error handler registration
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