### Question:
HashChecker { public static String hashFile(final String a_filename) { return hashFile(new File(a_filename)); } private  HashChecker(); static String hashFile(final String a_filename); static String hashFile(final File a_file); static final int BUFFER_SIZE; }### Answer:
@Test() public void testHashing() { try { final String test_string = "ColoradoRLA"; final Instant now = Instant.now(); final File test_file = File.createTempFile("to_hash-" + now, "txt"); final FileOutputStream fos = new FileOutputStream(test_file); fos.write(test_string.getBytes()); fos.close(); assertEquals("F9A25DA7060735572E32FCF72C33EE73476E589F7F02256DAFFB4C618D8F9EA2", HashChecker.hashFile(test_file)); assertEquals("F9A25DA7060735572E32FCF72C33EE73476E589F7F02256DAFFB4C618D8F9EA2", HashChecker.hashFile(test_file.toString())); } catch (final IOException e) { fail(); } }