@After
    @Before
    public void setupTest() {
        Spark.close();
        HadoopPools.close();
        KryoShimServiceLoader.close();
        logger.info("SparkContext has been closed for " + this.getClass().getCanonicalName() + "-setupTest");
    }
@author Marko A. Rodriguez (http://markorodriguez.com)
spark-gremlin/src/test/java/org/apache/tinkerpop/gremlin/spark/AbstractSparkTest.java