assertEquals("Foo", UPPER_UNDERSCORE.to(UPPER_CAMEL, "FOO"));
    assertEquals("FooBar", UPPER_UNDERSCORE.to(UPPER_CAMEL, "FOO_BAR"));
    assertEquals("HTTP", UPPER_UNDERSCORE.to(UPPER_CAMEL, "H_T_T_P"));
  }

  public void testUpperUnderscoreToUpperUnderscore() {
    assertEquals("FOO", UPPER_UNDERSCORE.to(UPPER_UNDERSCORE, "FOO"));
    assertEquals("FOO_BAR", UPPER_UNDERSCORE.to(UPPER_UNDERSCORE, "FOO_BAR"));
  }

    @Override
    String normalizeWord(String word) {
      return firstCharOnlyToUpper(word);
    }
  },

  /** Java and C++ constant naming convention, e.g., "UPPER_UNDERSCORE". */
  UPPER_UNDERSCORE(CharMatcher.is('_'), "_") {
    @Override
    String normalizeWord(String word) {
      return Ascii.toUpperCase(word);
    }

    @Override
    String convert(CaseFormat format, String s) {

    @Override
    String normalizeWord(String word) {
      return firstCharOnlyToUpper(word);
    }
  },

  /** Java and C++ constant naming convention, e.g., "UPPER_UNDERSCORE". */
  UPPER_UNDERSCORE(CharMatcher.is('_'), "_") {
    @Override
    String normalizeWord(String word) {
      return Ascii.toUpperCase(word);
    }

    @Override
    String convert(CaseFormat format, String s) {