<NME> PhraseInfoTest.java
<BEF> ADDFILE
<MSG> in PhraseDetector:
    extract phrases with df than threshold
add class PhraseInfo
PhraseSplitExtractor:
    use PhraseInfo instead of String in all methods

<DFF> @@ -0,0 +1,22 @@
+package edu.neu.ccs.pyramid.feature_extraction;
+
+import static org.junit.Assert.*;
+
+public class PhraseInfoTest {
+    public static void main(String[] args) {
+        test2();
+    }
+
+    static void test1(){
+        PhraseInfo left = new PhraseInfo("a b c");
+        PhraseInfo right = new PhraseInfo("c d");
+        System.out.println(PhraseInfo.connect(left,right));
+    }
+
+    static void test2(){
+        PhraseInfo left = new PhraseInfo("a b c");
+        PhraseInfo right = new PhraseInfo("a c d");
+        System.out.println(PhraseInfo.connect(left,right));
+    }
+
+}
\ No newline at end of file

in PhraseDetector:     extract phrases with df than threshold add class PhraseInfo PhraseSplitExtractor:     use PhraseInfo instead of String in all methods