Add a unit test

Author: yihua

hudi-client/hudi-client-common/src/test/java/org/apache/hudi/keygen/TestKeyGenUtils.java

@@ -27,16 +27,19 @@ public class TestKeyGenUtils {
   public void testExtractRecordKeys() {
     // test complex key form: field1:val1,field2:val2,...
     String[] s1 = KeyGenUtils.extractRecordKeys("id:1");
-    Assertions.assertArrayEquals(new String[]{"1"}, s1);
+    Assertions.assertArrayEquals(new String[] {"1"}, s1);
 
     String[] s2 = KeyGenUtils.extractRecordKeys("id:1,id:2");
-    Assertions.assertArrayEquals(new String[]{"1", "2"}, s2);
+    Assertions.assertArrayEquals(new String[] {"1", "2"}, s2);
 
     String[] s3 = KeyGenUtils.extractRecordKeys("id:1,id2:__null__,id3:__empty__");
-    Assertions.assertArrayEquals(new String[]{"1", null, ""}, s3);
+    Assertions.assertArrayEquals(new String[] {"1", null, ""}, s3);
+
+    String[] s4 = KeyGenUtils.extractRecordKeys("id:ab:cd,id2:ef");
+    Assertions.assertArrayEquals(new String[] {"ab:cd", "ef"}, s4);
 
     // test simple key form: val1
-    String[] s4 = KeyGenUtils.extractRecordKeys("1");
-    Assertions.assertArrayEquals(new String[]{"1"}, s4);
+    String[] s5 = KeyGenUtils.extractRecordKeys("1");
+    Assertions.assertArrayEquals(new String[] {"1"}, s5);
   }
 }