### Question:
HdfFile implements Group, AutoCloseable { @Override public boolean isGroup() { return true; } HdfFile(Path path);  HdfFile(URI uri);  HdfFile(File hdfFile); long getUserBlockSize(); ByteBuffer getUserBlockBuffer(); @Override void close(); long size(); @Override boolean isGroup(); @Override Map<String, Node> getChildren(); @Override String getName(); @Override String getPath(); @Override Map<String, Attribute> getAttributes(); @Override Attribute getAttribute(String name); @Override String toString(); @Override NodeType getType(); @Override Group getParent(); @Override File getFile(); @Override long getAddress(); @Override Iterator<Node> iterator(); @Override Node getChild(String name); @Override Node getByPath(String path); @Override Dataset getDatasetByPath(String path); @Override HdfFile getHdfFile(); void addExternalFile(HdfFile hdfFile); @Override boolean isLink(); @Override boolean isAttributeCreationOrderTracked(); @Override boolean isLinkCreationOrderTracked(); HdfFileChannel getHdfChannel();  }### Answer:
@Test void testHdfFileIsGroup() { try (HdfFile hdfFile = new HdfFile(new File(testFileUrl))) { assertThat(hdfFile.isGroup(), is(true)); } }