diff --git a/src/test/java/seedu/address/model/AddressBookListTest.java b/src/test/java/seedu/address/model/AddressBookListTest.java
index 9ef9f337cda..deba5311501 100644
--- a/src/test/java/seedu/address/model/AddressBookListTest.java
+++ b/src/test/java/seedu/address/model/AddressBookListTest.java
@@ -11,9 +11,12 @@ public class AddressBookListTest {
     @Test
     public void undo_success() {
         addressBookList.add(new AddressBook());
+        addressBookList.addCommandText("");
         addressBookList.add(new AddressBook());
+        addressBookList.addCommandText("");
         assertEquals(addressBookList.undo(), new AddressBook());
         addressBookList.add(new AddressBook());
+        addressBookList.addCommandText("");
         assertEquals(addressBookList.undo(), new AddressBook());
     }