### Question:
ParquetIOReaderImpl implements ParquetIOReader { @Override public void initFileForRead(File file) throws ParquetIOException { try { if(reader != null) { reader.close(); } reader = ParquetReader.builder(new GroupReadSupport(), new Path(file.getAbsolutePath())) .withConf(configuration) .build(); } catch (IOException ioex) { throw new ParquetIOException(ParquetIOErrorCode.PARQUETIO_IO_EXCEPTION,ioex); } } ParquetIOReaderImpl(Configuration configuration, boolean doFlatten, Path path); @Override List<JSONObject> processData(int rows); @Override boolean hasBufferData(); @Override void initFileForRead(File file); @Deprecated @Override ParquetIOReader initFileForRead(Path path); @Override ParquetIOReader initFileForRead(); @Override Iterator getIterator(); @Override void readerClose(); @Override List<ParquetIOField> getSchema(); ParquetReader<Group> getReader(); Configuration getConfiguration();  }### Answer:
@Test public void testInitFileForRead() throws URISyntaxException, ParquetIOException { parquetIOReader = (ParquetIOReaderImpl) new ParquetIOImpl().getParquetIOReader(false); assert (parquetIOReader.getReader() == null); URL dir_url = ClassLoader.getSystemResource("test_snappy.parquet"); File file = new File(dir_url.toURI()); parquetIOReader.initFileForRead(file); assert (parquetIOReader.getReader() != null); }