@Test
public void testParseFilterOperator()
{

    assertEquals( "= 5", QueryUtils.parseFilterOperator( "eq", "5" ) );
    assertEquals( "= 'ABC'", QueryUtils.parseFilterOperator( "eq", "ABC" ) );
    assertEquals( "like '%abc%'", QueryUtils.parseFilterOperator( "like", "abc" ) );
    assertEquals( " like '%abc'", QueryUtils.parseFilterOperator( "$like", "abc" ) );
    assertEquals( "in ('a','b','c')", QueryUtils.parseFilterOperator( "in", "[a,b,c]" ) );
    assertEquals( "in (1,2,3)", QueryUtils.parseFilterOperator( "in", "[1,2,3]" ) );
    assertEquals( "is not null", QueryUtils.parseFilterOperator( "!null", null ) );
}