### Question:
StringTools { public static String toRootLowerCase(String value) { if (value == null) { return null; } return value.toLowerCase(Locale.ROOT); } private  StringTools(); static String squashAndTrim(String value); static String toRootLowerCase(String value);  }### Answer:
@Test public void toRootLowerCase() { assertEquals("i", StringTools.toRootLowerCase("I")); }