<NME> NgramUtilTest.java
<BEF> ADDFILE
<MSG> add class NgramUtil

<DFF> @@ -0,0 +1,39 @@
+package edu.neu.ccs.pyramid.util;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import static org.junit.Assert.*;
+
+public class NgramUtilTest {
+    public static void main(String[] args) {
+        test4();
+    }
+
+    private static void test1(){
+        List<String> list = new ArrayList<>();
+        list.add("a");
+        System.out.println(NgramUtil.toNgram(list));
+    }
+
+    private static void test2(){
+        List<String> list = new ArrayList<>();
+        list.add("a");
+        list.add("b");
+        System.out.println(NgramUtil.toNgram(list));
+    }
+
+    private static void test3(){
+        List<String> list = new ArrayList<>();
+        list.add("a");
+        list.add("b");
+        list.add("c");
+        System.out.println(NgramUtil.toNgram(list));
+    }
+
+    private static void test4(){
+        List<String> list = new ArrayList<>();
+
+        System.out.println(NgramUtil.toNgram(list));
+    }
+}
\ No newline at end of file

add class NgramUtil