### Question:
IdentifierValidationUtil { public static boolean isValidBucketName(final String bucketName) { final Matcher m = VALID_BUCKET_NAME_PATTERN.matcher(bucketName); return m.matches(); }  static void validateMetaTags(final TestDefinition definition); static void validateTestName(final String testName); static boolean isValidBucketName(final String bucketName);  }### Answer:
@Test public void testIsValidBucketName() { assertThat(Arrays.asList("", "0invalid_bucket_Name")) .allMatch(name -> !isValidBucketName(name)); assertThat(Arrays.asList("valid_bucket_Name", "valid_bucket_Name0")) .allMatch(name -> isValidBucketName(name)); }