// throws jjtraveler.VisitFailure
public virtual void testBottomUp()
{
Identity id = new Identity();
Logger expected = new Logger(id, new IVisitable[]{n0, n1, n3, n2, n4} );
BottomUp visitor = new BottomUp( logVisitor(id) );
IVisitable nodeReturned = visitor.visit(n4);
Assertion.AssertEquals(expected, logger);
Assertion.AssertEquals(n4, nodeReturned);
}