Add tests

src/main/java/seedu/address/model/person/Phone.java

@@ -10,8 +10,8 @@
 public class Phone {
 
     public static final String MESSAGE_CONSTRAINTS =
-            "Phone numbers should only contain numbers (or start with + sign for international numbers), " +
-            "and it should be between 3 - 20 digits long";
+            "Phone numbers should only contain numbers (or start with + sign for international numbers), "
+            + "and it should be between 3 - 20 digits long";
     public static final String VALIDATION_REGEX = "\\d{3,}";
     public final String value;
 

src/test/java/seedu/address/model/person/PersonTest.java

@@ -35,6 +35,12 @@ public void isSamePerson() {
         editedAlice = new PersonBuilder(ALICE).withName(VALID_NAME_BOB).build();
         assertFalse(ALICE.isSamePerson(editedAlice));
 
+        editedAlice = new PersonBuilder(ALICE).withDob("1000-01-01").build();
+        assertFalse(ALICE.isSamePerson(editedAlice));
+
+        editedAlice = new PersonBuilder(ALICE).withPhone("911").withEmail("[email protected]").build();
+        assertFalse(ALICE.isSamePerson(editedAlice));
+
         // name differs in case, all other attributes same -> returns false
         Person editedBob = new PersonBuilder(BOB).withName(VALID_NAME_BOB.toLowerCase()).build();
         assertFalse(BOB.isSamePerson(editedBob));