kettle/tests/configs/kettle.tests.loadConfig.config.json

{
    "type": "kettle.tests.loadConfig.config",
    "options": {
        "gradeNames": ["fluid.component"],
        "components": {
            "subConfig": {
                "type": "kettle.tests.loadConfig.sub.config"
            }
        }
    },
    "loadConfigs": "kettle.tests.loadConfig.sub.config.json"
}