How to use the fastjsonschema.RefResolver function in fastjsonschema

def template_test(schema_version, schema, data, is_valid):
    """
    Test function to be used (imported) in final test file to run the tests
    which are generated by `pytest_generate_tests` hook.
    """
    # For debug purposes. When test fails, it will print stdout.
    resolver = RefResolver.from_schema(schema, handlers={'http': remotes_handler})

    debug_generator = _get_code_generator_class(schema_version)(schema, resolver=resolver)
    print(debug_generator.global_state_code)
    print(debug_generator.func_code)

    # JSON schema test suits do not contain schema version.
    # Our library needs to know that or it would use always the latest implementation.
    if isinstance(schema, dict):
        schema.setdefault('$schema', schema_version)

    validate = compile(schema, handlers={'http': remotes_handler})
    try:
        result = validate(data)
        print('Validate result:', result)
    except JsonSchemaException:
        if is_valid: