diff --git a/backend/tests/unit/test_auth_redirect_uri.py b/backend/tests/unit/test_auth_redirect_uri.py
index f5a2692d49..10f4f2986c 100644
--- a/backend/tests/unit/test_auth_redirect_uri.py
+++ b/backend/tests/unit/test_auth_redirect_uri.py
@@ -20,6 +20,7 @@
 
 from __future__ import annotations
 
+import importlib.util
 import os
 import sys
 import types
@@ -41,6 +42,7 @@
 # Pre-mock heavy deps before importing the module under test (Python 3.9 compat —
 # database.redis_db uses dict | None syntax that requires 3.10+).
 BACKEND_DIR = Path(__file__).resolve().parents[2]
+_BACKEND_DIR = str(BACKEND_DIR)
 
 
 def _ensure_package(name, path):
@@ -87,6 +89,31 @@ def _install_module(name):
 
 log_sanitizer_stub = _install_module("utils.log_sanitizer")
 log_sanitizer_stub.sanitize = MagicMock(side_effect=lambda value: value)
+jwt_stub = _install_module("jwt")
+jwt_algorithms_stub = _install_module("jwt.algorithms")
+jwt_algorithms_stub.RSAAlgorithm = MagicMock()
+
+_redis_db_mod = sys.modules['database.redis_db']
+for name in ['set_auth_session', 'get_auth_session', 'set_auth_code', 'get_auth_code', 'delete_auth_code']:
+    if not hasattr(_redis_db_mod, name):
+        setattr(_redis_db_mod, name, MagicMock())
+
+_firebase_admin_mod = types.ModuleType('firebase_admin')
+_firebase_admin_mod.auth = sys.modules['firebase_admin.auth']
+sys.modules.setdefault('firebase_admin', _firebase_admin_mod)
+
+
+def _install_python_multipart_stub():
+    if 'python_multipart' in sys.modules:
+        return False
+    if importlib.util.find_spec('python_multipart') is not None:
+        return False
+
+    mod = types.ModuleType('python_multipart')
+    mod.__version__ = '0.0.20'
+    sys.modules['python_multipart'] = mod
+    return True
+
 
 try:
     import jinja2  # noqa: F401
@@ -100,7 +127,16 @@ def _install_module(name):
 if str(BACKEND_DIR) not in sys.path:
     sys.path.insert(0, str(BACKEND_DIR))
 
-from routers.auth import _validate_redirect_uri  # noqa: E402
+_utils_pkg = sys.modules.get('utils')
+if _utils_pkg is not None:
+    _utils_pkg.__path__ = [os.path.join(_BACKEND_DIR, 'utils')]
+
+_remove_python_multipart_stub = _install_python_multipart_stub()
+try:
+    from routers.auth import _validate_redirect_uri  # noqa: E402
+finally:
+    if _remove_python_multipart_stub:
+        sys.modules.pop('python_multipart', None)
 
 # ---------------------------------------------------------------------------
 # Acceptance — every shape an existing Omi client uses