private SimpletypesConfig createSimpletypesConfig(String field, String value) {
        Slime slime = new Slime();
        Cursor root = slime.setObject();
        root.setString(field, value);
        return new ConfigPayload(slime).toInstance(SimpletypesConfig.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