FileData implements Serializable { public SortedMap<Integer, byte[]> getAllRecordsContent() { return records; } FileData();   FileData(FileData source); SortedMap<Integer, byte[]> getAllRecordsContent(); byte[] getContent(); byte[] getContent(int numRecord); byte[] getContent(int numRecord, int dataOffset, int dataLength); int getContentAsCounterValue(int numCounter); SortedMap<Integer, Integer> getAllCountersValue(); @Override String toString();  }
@Test public void getAllRecordsContent_whenNoContent_shouldReturnNotNullObject() { assertThat(file.getAllRecordsContent()).isNotNull(); }