exercism 0.1.9

My exercism
Documentation 
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use exercism::proverb::build_proverb;

#[test]
fn test_two_pieces() {
    let input = vec!["nail", "shoe"];
    let expected = vec![
        "For want of a nail the shoe was lost.",
        "And all for the want of a nail.",
    ]
        .join("\n");
    assert_eq!(build_proverb(&input), expected);
}
// Notice the change in the last line at three pieces.
#[test]
#[ignore]
fn test_three_pieces() {
    let input = vec!["nail", "shoe", "horse"];
    let expected = vec![
        "For want of a nail the shoe was lost.",
        "For want of a shoe the horse was lost.",
        "And all for the want of a nail.",
    ]
        .join("\n");
    assert_eq!(build_proverb(&input), expected);
}
#[test]
#[ignore]
fn test_one_piece() {
    let input = vec!["nail"];
    let expected = String::from("And all for the want of a nail.");
    assert_eq!(build_proverb(&input), expected);
}
#[test]
#[ignore]
fn test_zero_pieces() {
    let input: Vec<&str> = vec![];
    let expected = String::new();
    assert_eq!(build_proverb(&input), expected);
}
#[test]
#[ignore]
fn test_full() {
    let input = vec![
        "nail", "shoe", "horse", "rider", "message", "battle", "kingdom",
    ];
    let expected = vec![
        "For want of a nail the shoe was lost.",
        "For want of a shoe the horse was lost.",
        "For want of a horse the rider was lost.",
        "For want of a rider the message was lost.",
        "For want of a message the battle was lost.",
        "For want of a battle the kingdom was lost.",
        "And all for the want of a nail.",
    ]
        .join("\n");
    assert_eq!(build_proverb(&input), expected);
}
#[test]
#[ignore]
fn test_three_pieces_modernized() {
    let input = vec!["pin", "gun", "soldier", "battle"];
    let expected = vec![
        "For want of a pin the gun was lost.",
        "For want of a gun the soldier was lost.",
        "For want of a soldier the battle was lost.",
        "And all for the want of a pin.",
    ]
        .join("\n");
    assert_eq!(build_proverb(&input), expected);
}