void testErase() {
NodeRef node = Node::create("Test");
NodeRef child1 = Node::create("child1");
NodeRef child2 = Node::create("child2");
node->add_child(child1);
node->add_child(child2);
CPPUNIT_ASSERT_NO_THROW( node->del_child("child2") );
CPPUNIT_ASSERT_EQUAL ( 1, (int) node->num_children() );
CPPUNIT_ASSERT_THROW ( node->del_child ( "child2" ), Exception );
}
