### Question:
Conference { public void giveBackSeats(final int number) { if (seatsAvailable + number > maxAttendees) { throw new IllegalArgumentException("The number of seats will exceeds the capacity."); } seatsAvailable = seatsAvailable + number; } private  Conference();  Conference(final long id, final String organizerUserId,
                      final ConferenceForm conferenceForm); long getId(); String getName(); String getDescription(); @ApiResourceProperty(ignored = AnnotationBoolean.TRUE) Key<Profile> getProfileKey(); String getWebsafeKey(); @ApiResourceProperty(ignored = AnnotationBoolean.TRUE) String getOrganizerUserId(); String getOrganizerDisplayName(); List<String> getTopics(); String getCity(); Date getStartDate(); Date getEndDate(); int getMonth(); int getMaxAttendees(); int getSeatsAvailable(); void updateWithConferenceForm(ConferenceForm conferenceForm); void bookSeats(final int number); void giveBackSeats(final int number); @Override String toString();  }### Answer:
@Test(expected = IllegalArgumentException.class) public void testReturnSeatsFailure() throws Exception { Conference conference = new Conference(ID, ORGANIZER_USER_ID, conferenceForm); conference.giveBackSeats(1); }