Remove superfluous error messages in tests.

tests/backends/test_kwallet.py

@@ -56,16 +56,9 @@ def check_set_get(self, service, username, password):
         # re-init keyring to force migration
         self.keyring = keyring = self.init_keyring()
         ret_password = keyring.get_password(service, username)
-        assert ret_password == "", (
-            f"Incorrect password for username: {username!r} "
-            f"on service: {service!r}. {ret_password!r} != ''",
-        )
+        assert ret_password == ""
         ret_password = keyring.get_password('Python', username + '@' + service)
-        assert ret_password is None, (
-            f"Not 'None' password returned for username: {username!r} "
-            f"on service: {service!r}. {ret_password!r} is not None. Passwords from old "
-            "folder should be deleted during migration.",
-        )
+        assert ret_password is None
 
 
 @pytest.mark.skipif(