You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: DFS.rs
    path of file: ./repos/al-go-rithms/data_structures/Graphs/graph/Rust
    
    the code of the file until where you have to start completion: use std::io::stdin;

// DFS
    
fn test_dfs_with_graph() {
    let mut graph: Vec<Vec<usize>> = Vec::new();
    graph.resize(4, vec![]);

    add_edge(&mut graph, 0, 1);
    add_edge(&mut graph, 0, 2);
    add_edge(&mut graph, 1, 2);
    add_edge(&mut graph, 2, 0);
    add_edge(&mut graph, 2, 3);
    add_edge(&mut graph, 3, 3);

    println!("DFS Starting from vertex 2");

    dfs(&mut graph, 2);
}