@Test
public void evaluateMapValues(){

	FieldName name = new FieldName("x");
	MapValues expression = new MapValues(null);
	(expression.getFieldColumnPairs()).add(new FieldColumnPair(name, null));
	assertEquals(null, evaluate(expression, createContext()));
	expression.setMapMissingTo("Missing");
	assertEquals("Missing", evaluate(expression, createContext()));
	assertEquals(null, evaluate(expression, createContext(name, "3")));
	expression.setDefaultValue("Default");
	assertEquals("Default", evaluate(expression, createContext(name, "3")));
}