{"ast_node_type":"other","tokens":[{"end":43,"kind":"keyword","start":0,"text":"assert_successors(&graph,"}]}
    assert_successors(&graph, bcb(2), &[]);
    assert_successors(&graph, bcb(1), &[bcb(2), bcb(3)]);
    assert_successors(&graph, bcb(3), &[bcb(4)]);