@Test
public void evaluateStringFunctions(){

	assertEquals("VALUE", evaluate("uppercase", "Value"));
	assertEquals("value", evaluate("lowercase", "Value"));
	assertEquals("", evaluate("substring", "value", 1, 0));
	assertEquals("value", evaluate("substring", "value", 1, 5));
	assertEquals("alue", evaluate("substring", "value", 2, 4));
	assertEquals("valu", evaluate("substring", "value", 1, 4));
	assertEquals("value", evaluate("trimBlanks", "\tvalue\t"));
}