feat: export CacheXError, BackendNotFoundError and RequestNotFoundError

@cache and the proxies raise these exceptions, but unlike every session
and state exception they were only importable from
fastapi_cachex.exceptions. Re-export them from the package next to
LockTimeoutError.

Closes #160

Author: allen0099

fastapi_cachex/__init__.py

@@ -11,7 +11,10 @@
 from .dependencies import CacheBackend as CacheBackend
 from .dependencies import get_app_cache as get_app_cache
 from .dependencies import get_cache_backend as get_cache_backend
+from .exceptions import BackendNotFoundError as BackendNotFoundError
+from .exceptions import CacheXError as CacheXError
 from .exceptions import LockTimeoutError as LockTimeoutError
+from .exceptions import RequestNotFoundError as RequestNotFoundError
 from .lock import CacheLock as CacheLock
 from .manager import CacheManager as CacheManager
 from .manager_proxy import CacheManagerProxy as CacheManagerProxy
@@ -68,15 +71,18 @@ def _read_version() -> str:
 
 __all__ = [
     "AppCache",
+    "BackendNotFoundError",
     "BackendProxy",
     "CacheBackend",
     "CacheKeyBuilder",
     "CacheLock",
     "CacheManager",
     "CacheManagerProxy",
+    "CacheXError",
     "FastAPICacheXSessionMiddleware",
     "InvalidStateError",
     "LockTimeoutError",
+    "RequestNotFoundError",
     "Session",
     "SessionConfig",
     "SessionError",

tests/test_exports.py

@@ -0,0 +1,14 @@
+"""Exceptions raised by the core are importable from the package (#160)."""
+
+import pytest
+
+import fastapi_cachex
+from fastapi_cachex import exceptions
+
+
+@pytest.mark.parametrize(
+    "name", ["BackendNotFoundError", "CacheXError", "RequestNotFoundError"]
+)
+def test_core_exception_is_exported(name: str) -> None:
+    assert name in fastapi_cachex.__all__
+    assert getattr(fastapi_cachex, name) is getattr(exceptions, name)