front-vec 0.0.8

use super::FrontString;
use assert2::assert;

#[test]
fn basic_string_ops() {
    let mut s = FrontString::new();
    s.push_str_front("cadabra");
    s.push_str_front("abra");
    assert!(s == "abracadabra");
}

#[test]
fn fmt_debug() {
    let s1 = format!("{:?}", FrontString::from("asdf"));
    let s2 = format!("{:?}", String::from("asdf"));
    assert!(s1 == s2);
}

#[test]
fn fmt_display() {
    let s1 = format!("{}", FrontString::from("asdf"));
    let s2 = String::from("asdf");
    assert!(s1 == s2);
}

#[test]
fn char_to_bytes() {
    // From https://www.compart.com/en/unicode/U+306C
    let expected: [u8; 3] = [0xE3, 0x81, 0xAC];

    let ch = 'ぬ';
    let mut buf = [0; 4];
    let bytes = ch.encode_utf8(&mut buf);
    assert!(bytes.as_bytes() == &expected);
}

#[test]
fn unicode_characters() {
    // Example taken from here: https://www.cl.cam.ac.uk/~mgk25/ucs/examples/quickbrown.txt
    let full = "いろはにほへとちりぬるを";
    let first = 'い';
    let middle = "ろはにほ";
    let ch = 'へ';
    let end = "とちりぬるを";

    let mut s = FrontString::from(end);
    s.push_char_front(ch);
    s.push_str_front(middle);
    s.push_char_front(first);

    assert!(s == full);
}

#[test]
fn truncation() {
    let full = "いろはにほへとちりぬるを";
    let end = "とちりぬるを";
    let mut s = FrontString::from(full);
    s.truncate(end.len());
    assert!(s == end);
}

#[should_panic]
#[test]
fn bad_truncation() {
    let full = "いろはにほへとちりぬるを";
    let end = "とちりぬるを";
    let mut s = FrontString::from(full);
    s.truncate(end.len() - 1);
}

#[test]
fn extend_truncate_extend() {
    let mut s = FrontString::from("tion");
    assert!(s == "tion");
    s.push_str_front("revolu");
    assert!(s == "revolution");
    s.truncate("tion".len());
    assert!(s == "tion");
    s.push_str_front("evolu");
    assert!(s == "evolution");
}