    def test_invalid_schema_with_invalid_instance(self):
        """
        "Validating" an instance that's invalid under an invalid schema
        just shows the schema error.
        """
        self.assertOutputs(
            files=dict(
                some_schema='{"type": 12, "minimum": 30}',
                some_instance="13",
            ),
            argv=["-i", "some_instance", "some_schema"],

            exit_code=1,
            stderr="""\
                12: 12 is not valid under any of the given schemas
            """,
        )
"Validating" an instance that's invalid under an invalid schema
just shows the schema error.
jsonschema/tests/test_cli.py