### Question:
SimpleStringUtils { public static void toLowerCase(StringValue string) { final char[] chars = string.getCharArray(); final int len = string.length(); for (int i = 0; i < len; i++) { chars[i] = Character.toLowerCase(chars[i]); } } private  SimpleStringUtils(); static void toLowerCase(StringValue string); static void replaceNonWordChars(StringValue string, char replacement);  }### Answer:
@Test public void testToLowerCaseConverting() { StringValue testString = new StringValue("TEST"); SimpleStringUtils.toLowerCase(testString); assertEquals(new StringValue("test"), testString); }