@Test
public void testDeleteOfSingleMessage() {
Mailbox mailbox = new Mailbox(data) {};
assertEquals(1, data.size());
mailbox.delete(2);
assertEquals(0, data.size());
}
@Test
public void testDeleteOfMissingMessageCausesException() {
Mailbox mailbox = new Mailbox(data) {};
try {
mailbox.delete(22222);
} catch (Exception e) {
assertEquals("no such message ID", e.getMessage());
}
}