diff --git a/customization/test/NewUtilTest.java b/customization/test/NewUtilTest.java
index 0e8580a..1065f46 100644
--- a/customization/test/NewUtilTest.java
+++ b/customization/test/NewUtilTest.java
@@ -333,4 +333,21 @@ public class NewUtilTest {
 			System.out.println(matcher.group("field"));
 		}
 	}
+
+
+	@Test
+	public void testSplic(){
+		List<Integer> list = new ArrayList<>();
+		list.add(0);
+		list.add(1);
+		list.add(2);
+		list.add(3);
+		list.add(4);
+		list.add(5);
+		list.add(6);
+		System.out.println(list);
+		System.out.println(list.subList(0,2));
+		list.removeAll(list.subList(0,2));
+		System.out.println(list);
+	}
 }