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use core::ascii::Char;
use core::fmt::Write;
/// Tests Display implementation for ascii::Char.
#[test]
fn test_display() {
let want = (0..128u8).map(|b| b as char).collect::<String>();
let mut got = String::with_capacity(128);
for byte in 0..128 {
write!(&mut got, "{}", Char::from_u8(byte).unwrap()).unwrap();
}
assert_eq!(want, got);
}
/// Tests Debug implementation for ascii::Char.
#[test]
fn test_debug_control() {
for byte in 0..128u8 {
let mut want = format!("{:?}", byte as char);
// `char` uses `'\u{#}'` representation where ascii::char uses `'\x##'`.
// Transform former into the latter.
if let Some(rest) = want.strip_prefix("'\\u{") {
want = format!("'\\x{:0>2}'", rest.strip_suffix("}'").unwrap());
}
let chr = core::ascii::Char::from_u8(byte).unwrap();
assert_eq!(want, format!("{chr:?}"), "byte: {byte}");
}
}
/// Tests Extend implementation for ascii::Char.
#[test]
fn test_extend() {
let mut s = String::from("abc");
s.extend_one(Char::SmallD);
assert_eq!(s, String::from("abcd"));
let mut s = String::from("abc");
s.extend(Char::CapitalA..=Char::CapitalC);
assert_eq!(s, String::from("abcABC"));
}
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