diff --git a/src/solution/test.java b/src/solution/test.java
index c27fb7a..d62d0e4 100644
--- a/src/solution/test.java
+++ b/src/solution/test.java
@@ -6,9 +6,12 @@ import java.util.stream.Collectors;
 
 public class test {
     public static void main(String[] args) {
-        int[] nums = new int[]{9};
-        int[] result  = Solution.plusOne(nums);
+        ListNode head = new ListNode(1);
+        head.next = new ListNode(1);
+        head.next.next = new ListNode(1);
+        head.next.next.next = new ListNode(2);
+
+        ListNode result = Solution.deleteDuplicates(head);
         System.out.println(result.toString());
     }
-
 }