diff --git a/src/test/java/seedu/address/model/delivery/DeliveryListTest.java b/src/test/java/seedu/address/model/delivery/DeliveryListTest.java
index 6e23fad871e..abf4261fd74 100644
--- a/src/test/java/seedu/address/model/delivery/DeliveryListTest.java
+++ b/src/test/java/seedu/address/model/delivery/DeliveryListTest.java
@@ -124,8 +124,6 @@ public void sortById_success() {
         VALID_DELIVERY_LIST_ID_UNSORTED.add(VALID_DELIVERY_1);
         VALID_DELIVERY_LIST_ID_UNSORTED.sortById();
 
-        System.out.println(VALID_DELIVERY_LIST_ID_UNSORTED);
-
         assertArrayEquals(VALID_DELIVERY_LIST_ID_SORTED.asUnmodifiableObservableList().toArray(),
                 VALID_DELIVERY_LIST_ID_UNSORTED.asUnmodifiableObservableList().toArray());
     }
diff --git a/src/test/java/seedu/address/model/person/UniquePersonListTest.java b/src/test/java/seedu/address/model/person/UniquePersonListTest.java
index 17ae501df08..18219d00eec 100644
--- a/src/test/java/seedu/address/model/person/UniquePersonListTest.java
+++ b/src/test/java/seedu/address/model/person/UniquePersonListTest.java
@@ -1,5 +1,6 @@
 package seedu.address.model.person;
 
+import static org.junit.jupiter.api.Assertions.assertArrayEquals;
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertFalse;
 import static org.junit.jupiter.api.Assertions.assertTrue;
@@ -8,6 +9,8 @@
 import static seedu.address.testutil.Assert.assertThrows;
 import static seedu.address.testutil.TypicalPersons.ALICE;
 import static seedu.address.testutil.TypicalPersons.BOB;
+import static seedu.address.testutil.TypicalPersons.HOON;
+import static seedu.address.testutil.TypicalPersons.IDA;
 
 import java.util.Arrays;
 import java.util.Collections;
@@ -168,6 +171,111 @@ public void asUnmodifiableObservableList_modifyList_throwsUnsupportedOperationEx
             -> uniquePersonList.asUnmodifiableObservableList().remove(0));
     }
 
+    @Test
+    public void reversePersonList_success() {
+        uniquePersonList.add(ALICE);
+        uniquePersonList.add(HOON);
+        uniquePersonList.add(IDA);
+        uniquePersonList.add(BOB);
+
+        UniquePersonList expectedUniquePersonList = new UniquePersonList();
+        expectedUniquePersonList.add(BOB);
+        expectedUniquePersonList.add(IDA);
+        expectedUniquePersonList.add(HOON);
+        expectedUniquePersonList.add(ALICE);
+        expectedUniquePersonList.reversePersonList();
+    }
+
+    @Test
+    public void sortByDate_success() {
+        uniquePersonList.add(ALICE);
+        uniquePersonList.add(HOON);
+        uniquePersonList.add(IDA);
+        uniquePersonList.add(BOB);
+
+        UniquePersonList expectedUniquePersonList = new UniquePersonList();
+        expectedUniquePersonList.add(HOON);
+        expectedUniquePersonList.add(IDA);
+        expectedUniquePersonList.add(ALICE);
+        expectedUniquePersonList.add(BOB);
+        expectedUniquePersonList.sortByDate();
+
+        assertArrayEquals(uniquePersonList.asUnmodifiableObservableList().toArray(),
+                expectedUniquePersonList.asUnmodifiableObservableList().toArray());
+    }
+
+    @Test
+    public void sortByEmail_success() {
+        uniquePersonList.add(ALICE);
+        uniquePersonList.add(BOB);
+        uniquePersonList.add(IDA);
+        uniquePersonList.add(HOON);
+
+        UniquePersonList expectedUniquePersonList = new UniquePersonList();
+        expectedUniquePersonList.add(HOON);
+        expectedUniquePersonList.add(IDA);
+        expectedUniquePersonList.add(ALICE);
+        expectedUniquePersonList.add(BOB);
+        expectedUniquePersonList.sortByEmail();
+
+        assertArrayEquals(uniquePersonList.asUnmodifiableObservableList().toArray(),
+                expectedUniquePersonList.asUnmodifiableObservableList().toArray());
+    }
+
+    @Test
+    public void sortByName_success() {
+        uniquePersonList.add(ALICE);
+        uniquePersonList.add(BOB);
+        uniquePersonList.add(HOON);
+        uniquePersonList.add(IDA);
+
+        UniquePersonList expectedUniquePersonList = new UniquePersonList();
+        expectedUniquePersonList.add(HOON);
+        expectedUniquePersonList.add(BOB);
+        expectedUniquePersonList.add(IDA);
+        expectedUniquePersonList.add(ALICE);
+        expectedUniquePersonList.sortByName();
+
+        assertArrayEquals(uniquePersonList.asUnmodifiableObservableList().toArray(),
+                expectedUniquePersonList.asUnmodifiableObservableList().toArray());
+    }
+
+    @Test
+    public void sortByPhone_success() {
+        uniquePersonList.add(BOB);
+        uniquePersonList.add(IDA);
+        uniquePersonList.add(HOON);
+        uniquePersonList.add(ALICE);
+
+        UniquePersonList expectedUniquePersonList = new UniquePersonList();
+        expectedUniquePersonList.add(HOON);
+        expectedUniquePersonList.add(BOB);
+        expectedUniquePersonList.add(IDA);
+        expectedUniquePersonList.add(ALICE);
+        expectedUniquePersonList.sortByPhone();
+
+        assertArrayEquals(uniquePersonList.asUnmodifiableObservableList().toArray(),
+                expectedUniquePersonList.asUnmodifiableObservableList().toArray());
+    }
+
+    @Test
+    public void sortByRole_success() {
+        uniquePersonList.add(ALICE);
+        uniquePersonList.add(HOON);
+        uniquePersonList.add(IDA);
+        uniquePersonList.add(BOB);
+
+        UniquePersonList expectedUniquePersonList = new UniquePersonList();
+        expectedUniquePersonList.add(ALICE);
+        expectedUniquePersonList.add(HOON);
+        expectedUniquePersonList.add(IDA);
+        expectedUniquePersonList.add(BOB);
+        expectedUniquePersonList.sortByRole();
+
+        assertArrayEquals(uniquePersonList.asUnmodifiableObservableList().toArray(),
+                expectedUniquePersonList.asUnmodifiableObservableList().toArray());
+    }
+
     @Test
     public void toStringMethod() {
         assertEquals(uniquePersonList.asUnmodifiableObservableList().toString(), uniquePersonList.toString());