ExprNode filter = searchRequest.getFilter();
assertTrue( filter instanceof SubstringNode );
SubstringNode substringFilter = ( SubstringNode ) filter;
assertEquals( "jack", substringFilter.getInitial() );
List<String> initials = substringFilter.getAny();
assertEquals( 1, initials.size() );
assertEquals( "kate", initials.get( 0 ).toString() );
}