### Question:
StringUtil { public static String constToLowerCamelCase(final String str) { return constToCamelCase(str, false); } private  StringUtil(); static boolean isBlank(final String strValue); static String first2LowerCase(final String strValue); static String first2UpperCase(final String strValue); static String constToLowerCamelCase(final String str); static String constToUpperCamelCase(final String str); static String camelToConstCase(final String str); static String camelToSnakeCase(final String str); static boolean isUpperCamelCase(final String testString); static boolean isLowerCamelCase(final String testString); static boolean isSimpleLetterOrDigit(final char c); static String replace(final String str, final String oldStr, final String newStr); static void replace(final StringBuilder str, final String oldStr, final String newStr); static String format(final String msg, final Object... params);  }### Answer:
@Test public void testCaseTransformWithErrors() { Assertions.assertThrows(IllegalStateException.class, () -> StringUtil.constToLowerCamelCase("XXX_YYY12_PPP")); }
@Test public void testCaseTransformWithErrors2() { Assertions.assertThrows(IllegalStateException.class, () -> StringUtil.constToLowerCamelCase("XXX_YYY_12PPP")); }