@Test
    public void empty_reference_field_is_roundtrip_json_serialized() throws IOException {
        roundTripEquality("id:unittest:testrefs::helloworld",
                "{ \"ref_field\": \"\" }");
    }
Functional tests for com.yahoo.document.json.JsonWriter.

@author Steinar Knutsen
document/src/test/java/com/yahoo/document/json/JsonWriterTestCase.java