Update AGENTS.md

Author: AndreiDrang

tests/AGENTS.md

@@ -8,13 +8,26 @@ pytest + pytest-asyncio with mock server responses.
 |------|----------|
 | Test patterns | tests/*.py |
 | Mock responses | tests/static/responses.py |
-| Fixtures | Conftest in each test file |
+| Fixtures | tests/conftest.py - BaseTest class |
 
 ## CONVENTIONS
-- asyncio_mode = auto (pytest.ini)
+- asyncio_mode = auto (pyproject.toml)
 - API_KEY from env or mock
 - Each captcha type has dedicated test file
-- Mock server responses in static/responses.py
+- Test class naming: `Test<CaptchaType>`
+- Method naming: `test_sio_*` (sync), `test_aio_*` (async)
+- Response validation: `GetTaskResultResponseSer` from serializer
+
+## TEST PATTERNS
+- **BaseTest class**: Provides `get_proxy_args()`, `read_file()`, delay fixtures
+- **Parametrized tests**: `@pytest.mark.parametrize` for proxy types, captcha types
+- **Mocking**: `mocker.patch()` and `mocker.spy()` from pytest-mock
+- **Context managers**: Test via `mocker.spy(ContextManager, "__enter__")`
+- **Assertions**: `isinstance(result, dict)` + serializer validation
+
+## ANTI-PATTERNS
+- Don't skip BaseTest inheritance unless truly needed
+- Don't use real API calls in unit tests (use mocker)
 
 ## COMMANDS
 ```bash