Add Integration / Unit tests for Delete Meeting

Delete Meeting Command is lacking unit tests.

Let's-
Add unit integration tests for command.

Author: Maurice2n97

src/test/java/seedu/address/logic/commands/meetings/DeleteMeetingCommandTest.java

@@ -0,0 +1,93 @@
+package seedu.address.logic.commands.meetings;
+
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static seedu.address.logic.commands.meetings.MeetingCommandTestUtil.showMeetingAtIndex;
+import static seedu.address.logic.commands.persons.PersonCommandTestUtil.assertCommandFailure;
+import static seedu.address.logic.commands.persons.PersonCommandTestUtil.assertCommandSuccess;
+import static seedu.address.logic.commands.persons.PersonCommandTestUtil.showPersonAtIndex;
+import static seedu.address.testutil.TypicalIndexes.INDEX_FIRST;
+import static seedu.address.testutil.TypicalIndexes.INDEX_SECOND;
+import static seedu.address.testutil.TypicalMeetings.getTypicalMeetingBook;
+import static seedu.address.testutil.TypicalPersons.getTypicalAddressBook;
+
+
+import org.junit.jupiter.api.Test;
+
+import seedu.address.commons.core.Messages;
+import seedu.address.commons.core.index.Index;
+import seedu.address.logic.commands.persons.DeletePersonCommand;
+import seedu.address.model.Model;
+import seedu.address.model.ModelManager;
+import seedu.address.model.UserPrefs;
+import seedu.address.model.meeting.Meeting;
+import seedu.address.model.person.AddressBook;
+import seedu.address.model.person.Person;
+
+/**
+ * Contains integration tests (interaction with the Model) and unit tests for
+ * {@code DeleteMeetingCommand}.
+ */
+
+public class DeleteMeetingCommandTest {
+    private Model model = new ModelManager(new AddressBook(), getTypicalMeetingBook(), new UserPrefs());
+
+    @Test
+    public void execute_validIndexUnfilteredList_success() {
+        Meeting meetingToDelete = model.getFilteredMeetingList().get(INDEX_FIRST.getZeroBased());
+        DeleteMeetingCommand deleteMeetingCommand = new DeleteMeetingCommand(INDEX_FIRST);
+
+        String expectedMessage = String.format(DeleteMeetingCommand.MESSAGE_DELETE_MEETING_SUCCESS, meetingToDelete);
+
+        ModelManager expectedModel = new ModelManager(model.getAddressBook(), model.getMeetingBook(), new UserPrefs());
+        expectedModel.deleteMeeting(meetingToDelete);
+
+        assertCommandSuccess(deleteMeetingCommand, model, expectedMessage, expectedModel);
+    }
+
+    @Test
+    public void execute_invalidIndexUnfilteredList_throwsCommandException() {
+        Index outOfBoundIndex = Index.fromOneBased(model.getFilteredMeetingList().size() + 1);
+        DeleteMeetingCommand deleteMeetingCommand = new DeleteMeetingCommand(outOfBoundIndex);
+
+        assertCommandFailure(deleteMeetingCommand, model, Messages.MESSAGE_INVALID_MEETING_DISPLAYED_INDEX);
+    }
+
+    @Test
+    public void execute_validIndexFilteredList_success() {
+        showMeetingAtIndex(model, INDEX_FIRST);
+
+        Meeting meetingToDelete = model.getFilteredMeetingList().get(INDEX_FIRST.getZeroBased());
+        DeleteMeetingCommand deleteMeetingCommand = new DeleteMeetingCommand(INDEX_FIRST);
+
+        String expectedMessage = String.format(DeleteMeetingCommand.MESSAGE_DELETE_MEETING_SUCCESS, meetingToDelete);
+
+        Model expectedModel = new ModelManager(model.getAddressBook(), model.getMeetingBook(), new UserPrefs());
+        expectedModel.deleteMeeting(meetingToDelete);
+        showNoMeeting(expectedModel);
+
+        assertCommandSuccess(deleteMeetingCommand, model, expectedMessage, expectedModel);
+    }
+
+    /**
+     * Updates {@code model}'s filtered list to show no one.
+     */
+    private void showNoMeeting(Model model) {
+        model.updateFilteredMeetingList(p -> false);
+        assertTrue(model.getFilteredPersonList().isEmpty());
+    }
+
+    @Test
+    public void execute_invalidIndexFilteredList_throwsCommandException() {
+        showMeetingAtIndex(model, INDEX_FIRST);
+
+        Index outOfBoundIndex = INDEX_SECOND;
+        // ensures that outOfBoundIndex is still in bounds of meeting book list
+        assertTrue(outOfBoundIndex.getZeroBased() < model.getMeetingBook().getMeetingList().size());
+
+        DeleteMeetingCommand deleteMeetingCommand = new DeleteMeetingCommand(outOfBoundIndex);
+
+        assertCommandFailure(deleteMeetingCommand, model, Messages.MESSAGE_INVALID_MEETING_DISPLAYED_INDEX);
+    }
+
+}