with patch.object(SamDB, "modify") as add_mock:
add_mock.side_effect = ModelError("Custom error message")
result, out, err = self.runcmd("domain", "auth", "silo", "modify",
with patch.object(SamDB, "modify") as add_mock:
add_mock.side_effect = ModelError("Custom error message")
result, out, err = self.runcmd("domain", "auth", "silo", "modify",