chore: standardize security and quality foundations

backend/tests/test_api_models.py

@@ -0,0 +1,24 @@
+import unittest
+
+from pydantic import ValidationError
+
+from backend.app.api_models import PasswordResetRequest, SignupRequest
+
+
+class ApiRequestModelTests(unittest.TestCase):
+    def test_signup_rejects_unknown_fields(self) -> None:
+        with self.assertRaises(ValidationError):
+            SignupRequest(
+                invite_code="invite",
+                username="viewer",
+                password="strong password",
+                unexpected="value",
+            )
+
+    def test_password_reset_preserves_password_whitespace_for_policy_validation(self) -> None:
+        request = PasswordResetRequest(token="token", new_password=" leading and trailing ")
+        self.assertEqual(request.new_password, " leading and trailing ")
+
+
+if __name__ == "__main__":
+    unittest.main()