<NME> DFStatTest.java
<BEF> ADDFILE
<MSG> add new methods and todos

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+package edu.neu.ccs.pyramid.feature_extraction;
+
+import edu.neu.ccs.pyramid.elasticsearch.SingleLabelIndex;
+
+import static org.junit.Assert.*;
+
+public class DFStatTest {
+    public static void main(String[] args) throws Exception{
+        test1();
+    }
+
+    private static void test1() throws Exception{
+        SingleLabelIndex index = new SingleLabelIndex.Builder().setIndexName("cnn").setClientType("node")
+                .setLabelField("label").build();
+        String[] ids = new String[1000];
+        for (int i=0;i<1000;i++){
+            ids[i] = ""+i;
+        }
+        DFStat dfStat = new DFStat(9,"barack",index,ids);
+        System.out.println(dfStat);
+        index.close();
+    }
+
+}
\ No newline at end of file

add new methods and todos