### Question:
RocksUtils { public static boolean isSstFile(File file) { return file.getName().endsWith(".sst"); }  static void close(AbstractImmutableNativeReference ref); static boolean isSstFile(File file); static String getDestCheckpointsPath(String dbPrefix); static String getDestCheckpointPath(String dbPrefix, String checkpointId); static String getDestCheckpointMetadataPath(String dbPrefix, String checkpointId); static String getDestSstsPath(String dbPrefix); static String getDestSstPath(String dbPrefix, File file); static String getDestSstPath(String dbPrefix, String fileName); static String getDestTempSstPath(String dbPrefix, String checkpointId, File file); static String getDestPath(String dbPrefix,
                                     String checkpointId,
                                     File file);  }### Answer:
@Test public void testIsSstFile() { assertTrue(RocksUtils.isSstFile(new File("test.sst"))); }
@Test public void testIsNotSstFile() { assertFalse(RocksUtils.isSstFile(new File("test.sst1"))); }