Testing docFieldLongs

I have a function, in which I call docFieldLongs. In unit testing I need to
create and override this function and also return ScriptDocValues.Longs.

@Test
public void testRunAsLongs throws Exception()
{
    script = new MaxiScoreScript(params){
        @Override
        protected ScriptDocValues.Longs docFieldLongs(String getter){
            IndexWriter writer = new IndexWriter(new RAMDirectory(), 

new IndexWriterConfig(Lucene.VERSION, new
StandardAnalyzer(Lucene.VERSION)).setMergePolicy(new
LogByteSizeMergePolicy()));
Document d = new Document();
d.add(new LongField("value", 102, Field.Store.NO));
d.add(new LongField("value" ,101, Field.Store.NO));
writer.addDocument(d);

            IndexNumericFieldData indexFieldData = 

IndexFieldDataService.getForField("value");
AtomicNumericFieldData fieldData =
indexFieldData.load(refreshReader());

            AtomicNumericFieldData temp = fieldData;

            // return (ScriptDocValues.Longs) temp.getScriptValues();
        }

    }


}

The main aim of this is to get the same type returned. However I am having
a few issues with this, with regards to refreshReader. I also feel this is
a very long winded way of doing things.

In summary, I simply want to override docFiledLongs, to return ScriptDocValues.Longs which I have defined. In my function, I call
docFieldLongs("docFieldItems").getValues();

I want this statement when tested to return a List items, being
[101L,102L].

Any help would be greatly appreciated.

Thanks

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