@Test
public void testIntegerTypes() throws Exception {

  Expression expression = parseExpression("5 ne 545678979");
  assertEquals("{5 NE 545678979}", expression.toString());
  
  expression = parseExpression("5456 eq 5456");
  assertEquals("{5456 EQ 5456}", expression.toString());
  
  expression = parseExpression("null ne 54561234567");
  assertEquals("{null NE 54561234567}", expression.toString());
  
  expression = parseExpression("null ne 255");
  assertEquals("{null NE 255}", expression.toString());
  
  expression = parseExpression("123 le 2551234567890000999999");
  assertEquals("{123 LE 2551234567890000999999}", expression.toString());
}