S.K.

Another idea: Larger caves! e.g. a cave which fits all 4 largest freetime buildings.

Note the signatures mp3file.save(String) instead of mp3file.save(File). The test case I mean would be (sort of): public void shouldThrowExceptionIfSavingMp3WithSameNameAsSourceFileForFileConstructor() throws Exception { Mp3File mp3File = new Mp3File(new File(MP3_WITH_ID3V1_AND_ID3V23_AND_CUSTOM_TAGS)); //