test: fix get all users emtpy

app/services/user_service.py

@@ -19,3 +19,10 @@ async def save_user(user: UserCreate) -> User:
 async def get_all_users() -> list[User]:
     log.debug("Reading all users")
     return _fake_db
+
+
+# Clears the in-memory user store.
+# Used only in tests to ensure isolation between runs.
+def _reset_users():
+    global _fake_db
+    _fake_db = []

tests/conftest.py

@@ -0,0 +1,7 @@
+import pytest
+from app.services.user_service import _reset_users
+
+
+@pytest.fixture(autouse=True)
+def clean_fake_db():
+    _reset_users()

tests/services/test_user_service.py

@@ -16,4 +16,4 @@ async def test_save_user():
 async def test_get_all_users_empty():
     users = await get_all_users()
     assert isinstance(users, list)
-    assert len(users) > 0
+    assert len(users) == 0