### Question:
TokenName { public static String canonicalize(final String name, final String prefix) { Matcher groupMatcher = STRING_NAME_GROUPING.matcher(name); if (!groupMatcher.find()) return prefix + name.toUpperCase(); StringBuilder builder = new StringBuilder(prefix); builder.append(groupMatcher.group(0).toUpperCase()); while (groupMatcher.find()) { builder.append("_"); builder.append(groupMatcher.group(0).toUpperCase()); } return builder.toString(); } private  TokenName(); static String canonicalize(final String name, final String prefix); static String canonicalize(final String name);  }### Answer:
@Test public void testCanonicalize() { assertEquals("A", TokenName.canonicalize("a")); assertEquals("B", TokenName.canonicalize("b")); assertEquals("1", TokenName.canonicalize("1")); assertEquals("SOME_URL", TokenName.canonicalize("someURL")); assertEquals("LOWERCASE_WITH_DASHES", TokenName.canonicalize("lowercase-with-dashes")); assertEquals("HEADLESS_CAMEL_CASE", TokenName.canonicalize("headlessCamelCase")); assertEquals("CAMEL_CASE", TokenName.canonicalize("CamelCase")); assertEquals("CAMEL_CASE", TokenName.canonicalize("CamelCase")); assertEquals("LOWERCASE_WITH_UNDERSCORES", TokenName.canonicalize("lowercase_with_underscores")); assertEquals("UPPERCASE_WITH_UNDERSCORES", TokenName.canonicalize("UPPERCASE_WITH_UNDERSCORES")); assertEquals("A_VERY_INCONSISTENT_MIX_OF_ALL_STYLES", TokenName.canonicalize("aVery-INCONSISTENTMix_ofAllStyles")); assertEquals("ABC_123_DEF_456", TokenName.canonicalize("abc123def456")); assertEquals("ABC_123_DEF_456", TokenName.canonicalize("ABC123DEF456")); assertEquals("WORD_A_WORD_AB_WORD_ABC_WORD", TokenName.canonicalize("WordAWordABWordABCWord")); assertEquals("AUTH_ATTRIBUTE", TokenName.canonicalize("Attribute", "AUTH_")); assertEquals("auth_SOMETHING", TokenName.canonicalize("Something", "auth_")); }