private StructtypesConfig createStructtypesConfigNested(String name, String gender) {
        Slime slime = new Slime();
        addStructFields(slime.setObject().setObject("nested").setObject("inner"), name, gender, null);
        return new ConfigPayload(slime).toInstance(StructtypesConfig.class, "");
    }
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Helper methods. consider moving out to another class for reuse by merge tester.            *
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config/src/test/java/com/yahoo/vespa/config/ConfigPayloadTest.java