@Override
    protected Class<? extends OutputFormat<NullWritable, VertexWritable>> getOutputFormat() {
        return ScriptOutputFormat.class;
    }
@author Daniel Kuppitz (http://gremlin.guru)
hadoop-gremlin/src/test/java/org/apache/tinkerpop/gremlin/hadoop/structure/io/script/ScriptRecordReaderWriterTest.java