EditCommandTest: add integration tests with Undo/RedoCommand

EditCommandTest does not have any integration tests for the interaction
with UndoCommand and RedoCommand on an unfiltered list.

Let's add integration tests for the interaction of EditCommand with
UndoCommand and RedoCommand on an unfiltered list.

src/test/java/seedu/address/logic/commands/EditCommandTest.java

@@ -150,6 +150,46 @@ public void execute_invalidPersonIndexFilteredList_failure() {
         assertCommandFailure(editCommand, model, Messages.MESSAGE_INVALID_PERSON_DISPLAYED_INDEX);
     }
 
+    @Test
+    public void executeUndoRedo_validIndexUnfilteredList_success() throws Exception {
+        UndoRedoStack undoRedoStack = new UndoRedoStack();
+        UndoCommand undoCommand = prepareUndoCommand(model, undoRedoStack);
+        RedoCommand redoCommand = prepareRedoCommand(model, undoRedoStack);
+        Person editedPerson = new PersonBuilder().build();
+        Person personToEdit = model.getFilteredPersonList().get(INDEX_FIRST_PERSON.getZeroBased());
+        EditPersonDescriptor descriptor = new EditPersonDescriptorBuilder(editedPerson).build();
+        EditCommand editCommand = prepareCommand(INDEX_FIRST_PERSON, descriptor);
+        Model expectedModel = new ModelManager(new AddressBook(model.getAddressBook()), new UserPrefs());
+
+        // edit -> first person edited
+        editCommand.execute();
+        undoRedoStack.push(editCommand);
+
+        // undo -> reverts addressbook back to previous state and filtered person list to show all persons
+        assertCommandSuccess(undoCommand, model, UndoCommand.MESSAGE_SUCCESS, expectedModel);
+
+        // redo -> same first person edited again
+        expectedModel.updatePerson(personToEdit, editedPerson);
+        assertCommandSuccess(redoCommand, model, RedoCommand.MESSAGE_SUCCESS, expectedModel);
+    }
+
+    @Test
+    public void executeUndoRedo_invalidIndexUnfilteredList_failure() {
+        UndoRedoStack undoRedoStack = new UndoRedoStack();
+        UndoCommand undoCommand = prepareUndoCommand(model, undoRedoStack);
+        RedoCommand redoCommand = prepareRedoCommand(model, undoRedoStack);
+        Index outOfBoundIndex = Index.fromOneBased(model.getFilteredPersonList().size() + 1);
+        EditPersonDescriptor descriptor = new EditPersonDescriptorBuilder().withName(VALID_NAME_BOB).build();
+        EditCommand editCommand = prepareCommand(outOfBoundIndex, descriptor);
+
+        // execution failed -> editCommand not pushed into undoRedoStack
+        assertCommandFailure(editCommand, model, Messages.MESSAGE_INVALID_PERSON_DISPLAYED_INDEX);
+
+        // no commands in undoRedoStack -> undoCommand and redoCommand fail
+        assertCommandFailure(undoCommand, model, UndoCommand.MESSAGE_FAILURE);
+        assertCommandFailure(redoCommand, model, RedoCommand.MESSAGE_FAILURE);
+    }
+
     /**
      * 1. Edits a {@code Person} from a filtered list.
      * 2. Undo the edit.