mirror of
https://github.com/rust-lang/rust.git
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878 lines
24 KiB
Rust
878 lines
24 KiB
Rust
use std::assert_matches::assert_matches;
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use std::borrow::Cow;
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use std::cell::Cell;
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use std::collections::TryReserveErrorKind::*;
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use std::ops::Bound::*;
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use std::ops::{Bound, RangeBounds};
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use std::{panic, str};
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pub trait IntoCow<'a, B: ?Sized>
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where
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B: ToOwned,
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{
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fn into_cow(self) -> Cow<'a, B>;
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}
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impl<'a> IntoCow<'a, str> for String {
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fn into_cow(self) -> Cow<'a, str> {
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Cow::Owned(self)
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}
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}
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impl<'a> IntoCow<'a, str> for &'a str {
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fn into_cow(self) -> Cow<'a, str> {
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Cow::Borrowed(self)
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}
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}
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#[test]
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fn test_from_str() {
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let owned: Option<std::string::String> = "string".parse().ok();
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assert_eq!(owned.as_ref().map(|s| &**s), Some("string"));
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}
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#[test]
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fn test_from_cow_str() {
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assert_eq!(String::from(Cow::Borrowed("string")), "string");
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assert_eq!(String::from(Cow::Owned(String::from("string"))), "string");
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}
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#[test]
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fn test_unsized_to_string() {
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let s: &str = "abc";
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let _: String = (*s).to_string();
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}
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#[test]
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fn test_from_utf8() {
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let xs = b"hello".to_vec();
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assert_eq!(String::from_utf8(xs).unwrap(), String::from("hello"));
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let xs = "ศไทย中华Việt Nam".as_bytes().to_vec();
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assert_eq!(String::from_utf8(xs).unwrap(), String::from("ศไทย中华Việt Nam"));
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let xs = b"hello\xFF".to_vec();
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let err = String::from_utf8(xs).unwrap_err();
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assert_eq!(err.as_bytes(), b"hello\xff");
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let err_clone = err.clone();
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assert_eq!(err, err_clone);
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assert_eq!(err.into_bytes(), b"hello\xff".to_vec());
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assert_eq!(err_clone.utf8_error().valid_up_to(), 5);
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}
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#[test]
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fn test_from_utf8_lossy() {
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let xs = b"hello";
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let ys: Cow<'_, str> = "hello".into_cow();
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assert_eq!(String::from_utf8_lossy(xs), ys);
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let xs = "ศไทย中华Việt Nam".as_bytes();
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let ys: Cow<'_, str> = "ศไทย中华Việt Nam".into_cow();
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assert_eq!(String::from_utf8_lossy(xs), ys);
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let xs = b"Hello\xC2 There\xFF Goodbye";
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assert_eq!(
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String::from_utf8_lossy(xs),
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String::from("Hello\u{FFFD} There\u{FFFD} Goodbye").into_cow()
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);
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let xs = b"Hello\xC0\x80 There\xE6\x83 Goodbye";
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assert_eq!(
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String::from_utf8_lossy(xs),
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String::from("Hello\u{FFFD}\u{FFFD} There\u{FFFD} Goodbye").into_cow()
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);
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let xs = b"\xF5foo\xF5\x80bar";
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assert_eq!(
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String::from_utf8_lossy(xs),
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String::from("\u{FFFD}foo\u{FFFD}\u{FFFD}bar").into_cow()
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);
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let xs = b"\xF1foo\xF1\x80bar\xF1\x80\x80baz";
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assert_eq!(
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String::from_utf8_lossy(xs),
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String::from("\u{FFFD}foo\u{FFFD}bar\u{FFFD}baz").into_cow()
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);
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let xs = b"\xF4foo\xF4\x80bar\xF4\xBFbaz";
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assert_eq!(
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String::from_utf8_lossy(xs),
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String::from("\u{FFFD}foo\u{FFFD}bar\u{FFFD}\u{FFFD}baz").into_cow()
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);
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let xs = b"\xF0\x80\x80\x80foo\xF0\x90\x80\x80bar";
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assert_eq!(
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String::from_utf8_lossy(xs),
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String::from("\u{FFFD}\u{FFFD}\u{FFFD}\u{FFFD}foo\u{10000}bar").into_cow()
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);
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// surrogates
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let xs = b"\xED\xA0\x80foo\xED\xBF\xBFbar";
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assert_eq!(
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String::from_utf8_lossy(xs),
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String::from("\u{FFFD}\u{FFFD}\u{FFFD}foo\u{FFFD}\u{FFFD}\u{FFFD}bar").into_cow()
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);
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}
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#[test]
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fn test_from_utf16() {
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let pairs = [
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(
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String::from("𐍅𐌿𐌻𐍆𐌹𐌻𐌰\n"),
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vec![
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0xd800, 0xdf45, 0xd800, 0xdf3f, 0xd800, 0xdf3b, 0xd800, 0xdf46, 0xd800, 0xdf39,
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0xd800, 0xdf3b, 0xd800, 0xdf30, 0x000a,
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],
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),
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(
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String::from("𐐒𐑉𐐮𐑀𐐲𐑋 𐐏𐐲𐑍\n"),
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vec![
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0xd801, 0xdc12, 0xd801, 0xdc49, 0xd801, 0xdc2e, 0xd801, 0xdc40, 0xd801, 0xdc32,
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0xd801, 0xdc4b, 0x0020, 0xd801, 0xdc0f, 0xd801, 0xdc32, 0xd801, 0xdc4d, 0x000a,
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],
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),
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(
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String::from("𐌀𐌖𐌋𐌄𐌑𐌉·𐌌𐌄𐌕𐌄𐌋𐌉𐌑\n"),
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vec![
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0xd800, 0xdf00, 0xd800, 0xdf16, 0xd800, 0xdf0b, 0xd800, 0xdf04, 0xd800, 0xdf11,
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0xd800, 0xdf09, 0x00b7, 0xd800, 0xdf0c, 0xd800, 0xdf04, 0xd800, 0xdf15, 0xd800,
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0xdf04, 0xd800, 0xdf0b, 0xd800, 0xdf09, 0xd800, 0xdf11, 0x000a,
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],
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),
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(
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String::from("𐒋𐒘𐒈𐒑𐒛𐒒 𐒕𐒓 𐒈𐒚𐒍 𐒏𐒜𐒒𐒖𐒆 𐒕𐒆\n"),
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vec![
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0xd801, 0xdc8b, 0xd801, 0xdc98, 0xd801, 0xdc88, 0xd801, 0xdc91, 0xd801, 0xdc9b,
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0xd801, 0xdc92, 0x0020, 0xd801, 0xdc95, 0xd801, 0xdc93, 0x0020, 0xd801, 0xdc88,
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0xd801, 0xdc9a, 0xd801, 0xdc8d, 0x0020, 0xd801, 0xdc8f, 0xd801, 0xdc9c, 0xd801,
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0xdc92, 0xd801, 0xdc96, 0xd801, 0xdc86, 0x0020, 0xd801, 0xdc95, 0xd801, 0xdc86,
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0x000a,
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],
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),
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// Issue #12318, even-numbered non-BMP planes
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(String::from("\u{20000}"), vec![0xD840, 0xDC00]),
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];
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for p in &pairs {
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let (s, u) = (*p).clone();
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let s_as_utf16 = s.encode_utf16().collect::<Vec<u16>>();
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let u_as_string = String::from_utf16(&u).unwrap();
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assert!(core::char::decode_utf16(u.iter().cloned()).all(|r| r.is_ok()));
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assert_eq!(s_as_utf16, u);
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assert_eq!(u_as_string, s);
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assert_eq!(String::from_utf16_lossy(&u), s);
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assert_eq!(String::from_utf16(&s_as_utf16).unwrap(), s);
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assert_eq!(u_as_string.encode_utf16().collect::<Vec<u16>>(), u);
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}
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}
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#[test]
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fn test_utf16_invalid() {
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// completely positive cases tested above.
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// lead + eof
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assert!(String::from_utf16(&[0xD800]).is_err());
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// lead + lead
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assert!(String::from_utf16(&[0xD800, 0xD800]).is_err());
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// isolated trail
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assert!(String::from_utf16(&[0x0061, 0xDC00]).is_err());
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// general
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assert!(String::from_utf16(&[0xD800, 0xd801, 0xdc8b, 0xD800]).is_err());
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}
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#[test]
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fn test_from_utf16_lossy() {
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// completely positive cases tested above.
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// lead + eof
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assert_eq!(String::from_utf16_lossy(&[0xD800]), String::from("\u{FFFD}"));
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// lead + lead
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assert_eq!(String::from_utf16_lossy(&[0xD800, 0xD800]), String::from("\u{FFFD}\u{FFFD}"));
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// isolated trail
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assert_eq!(String::from_utf16_lossy(&[0x0061, 0xDC00]), String::from("a\u{FFFD}"));
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// general
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assert_eq!(
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String::from_utf16_lossy(&[0xD800, 0xd801, 0xdc8b, 0xD800]),
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String::from("\u{FFFD}𐒋\u{FFFD}")
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);
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}
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#[test]
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fn test_push_bytes() {
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let mut s = String::from("ABC");
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unsafe {
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let mv = s.as_mut_vec();
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mv.extend_from_slice(&[b'D']);
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}
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assert_eq!(s, "ABCD");
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}
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#[test]
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fn test_push_str() {
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let mut s = String::new();
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s.push_str("");
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assert_eq!(&s[0..], "");
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s.push_str("abc");
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assert_eq!(&s[0..], "abc");
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s.push_str("ประเทศไทย中华Việt Nam");
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assert_eq!(&s[0..], "abcประเทศไทย中华Việt Nam");
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}
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#[test]
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fn test_add_assign() {
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let mut s = String::new();
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s += "";
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assert_eq!(s.as_str(), "");
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s += "abc";
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assert_eq!(s.as_str(), "abc");
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s += "ประเทศไทย中华Việt Nam";
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assert_eq!(s.as_str(), "abcประเทศไทย中华Việt Nam");
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}
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#[test]
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fn test_push() {
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let mut data = String::from("ประเทศไทย中");
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data.push('华');
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data.push('b'); // 1 byte
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data.push('¢'); // 2 byte
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data.push('€'); // 3 byte
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data.push('𤭢'); // 4 byte
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assert_eq!(data, "ประเทศไทย中华b¢€𤭢");
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}
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#[test]
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fn test_pop() {
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let mut data = String::from("ประเทศไทย中华b¢€𤭢");
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assert_eq!(data.pop().unwrap(), '𤭢'); // 4 bytes
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assert_eq!(data.pop().unwrap(), '€'); // 3 bytes
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assert_eq!(data.pop().unwrap(), '¢'); // 2 bytes
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assert_eq!(data.pop().unwrap(), 'b'); // 1 bytes
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assert_eq!(data.pop().unwrap(), '华');
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assert_eq!(data, "ประเทศไทย中");
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}
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#[test]
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fn test_split_off_empty() {
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let orig = "Hello, world!";
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let mut split = String::from(orig);
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let empty: String = split.split_off(orig.len());
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assert!(empty.is_empty());
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}
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#[test]
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#[should_panic]
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fn test_split_off_past_end() {
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let orig = "Hello, world!";
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let mut split = String::from(orig);
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let _ = split.split_off(orig.len() + 1);
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}
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#[test]
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#[should_panic]
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fn test_split_off_mid_char() {
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let mut shan = String::from("山");
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let _broken_mountain = shan.split_off(1);
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}
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#[test]
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fn test_split_off_ascii() {
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let mut ab = String::from("ABCD");
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let orig_capacity = ab.capacity();
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let cd = ab.split_off(2);
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assert_eq!(ab, "AB");
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assert_eq!(cd, "CD");
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assert_eq!(ab.capacity(), orig_capacity);
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}
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#[test]
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fn test_split_off_unicode() {
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let mut nihon = String::from("日本語");
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let orig_capacity = nihon.capacity();
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let go = nihon.split_off("日本".len());
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assert_eq!(nihon, "日本");
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assert_eq!(go, "語");
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assert_eq!(nihon.capacity(), orig_capacity);
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}
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#[test]
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fn test_str_truncate() {
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let mut s = String::from("12345");
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s.truncate(5);
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assert_eq!(s, "12345");
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s.truncate(3);
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assert_eq!(s, "123");
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s.truncate(0);
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assert_eq!(s, "");
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let mut s = String::from("12345");
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let p = s.as_ptr();
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s.truncate(3);
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s.push_str("6");
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let p_ = s.as_ptr();
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assert_eq!(p_, p);
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}
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#[test]
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fn test_str_truncate_invalid_len() {
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let mut s = String::from("12345");
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s.truncate(6);
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assert_eq!(s, "12345");
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}
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#[test]
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#[should_panic]
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fn test_str_truncate_split_codepoint() {
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let mut s = String::from("\u{FC}"); // ü
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s.truncate(1);
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}
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#[test]
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fn test_str_clear() {
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let mut s = String::from("12345");
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s.clear();
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assert_eq!(s.len(), 0);
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assert_eq!(s, "");
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}
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#[test]
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fn test_str_add() {
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let a = String::from("12345");
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let b = a + "2";
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let b = b + "2";
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assert_eq!(b.len(), 7);
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assert_eq!(b, "1234522");
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}
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#[test]
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fn remove() {
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let mut s = "ศไทย中华Việt Nam; foobar".to_string();
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assert_eq!(s.remove(0), 'ศ');
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assert_eq!(s.len(), 33);
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assert_eq!(s, "ไทย中华Việt Nam; foobar");
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assert_eq!(s.remove(17), 'ệ');
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assert_eq!(s, "ไทย中华Vit Nam; foobar");
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}
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#[test]
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#[should_panic]
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fn remove_bad() {
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"ศ".to_string().remove(1);
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}
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#[test]
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fn test_remove_matches() {
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// test_single_pattern_occurrence
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let mut s = "abc".to_string();
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s.remove_matches('b');
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assert_eq!(s, "ac");
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// repeat_test_single_pattern_occurrence
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s.remove_matches('b');
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assert_eq!(s, "ac");
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// test_single_character_pattern
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let mut s = "abcb".to_string();
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s.remove_matches('b');
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assert_eq!(s, "ac");
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// test_pattern_with_special_characters
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let mut s = "ศไทย中华Việt Nam; foobarศ".to_string();
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s.remove_matches('ศ');
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assert_eq!(s, "ไทย中华Việt Nam; foobar");
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// test_pattern_empty_text_and_pattern
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let mut s = "".to_string();
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s.remove_matches("");
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assert_eq!(s, "");
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// test_pattern_empty_text
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let mut s = "".to_string();
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s.remove_matches("something");
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assert_eq!(s, "");
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// test_empty_pattern
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let mut s = "Testing with empty pattern.".to_string();
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s.remove_matches("");
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assert_eq!(s, "Testing with empty pattern.");
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// test_multiple_consecutive_patterns_1
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let mut s = "aaaaa".to_string();
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s.remove_matches('a');
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assert_eq!(s, "");
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// test_multiple_consecutive_patterns_2
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let mut s = "Hello **world****today!**".to_string();
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s.remove_matches("**");
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assert_eq!(s, "Hello worldtoday!");
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// test_case_insensitive_pattern
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let mut s = "CASE ** SeNsItIvE ** PaTtErN.".to_string();
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s.remove_matches("sEnSiTiVe");
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assert_eq!(s, "CASE ** SeNsItIvE ** PaTtErN.");
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// test_pattern_with_digits
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let mut s = "123 ** 456 ** 789".to_string();
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s.remove_matches("**");
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assert_eq!(s, "123 456 789");
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// test_pattern_occurs_after_empty_string
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let mut s = "abc X defXghi".to_string();
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s.remove_matches("X");
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assert_eq!(s, "abc defghi");
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// test_large_pattern
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let mut s = "aaaXbbbXcccXdddXeee".to_string();
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s.remove_matches("X");
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assert_eq!(s, "aaabbbcccdddeee");
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// test_pattern_at_multiple_positions
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let mut s = "Pattern ** found ** multiple ** times ** in ** text.".to_string();
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s.remove_matches("**");
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assert_eq!(s, "Pattern found multiple times in text.");
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}
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#[test]
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#[cfg_attr(not(panic = "unwind"), ignore = "test requires unwinding support")]
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fn test_retain() {
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let mut s = String::from("α_β_γ");
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s.retain(|_| true);
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assert_eq!(s, "α_β_γ");
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s.retain(|c| c != '_');
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assert_eq!(s, "αβγ");
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s.retain(|c| c != 'β');
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assert_eq!(s, "αγ");
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s.retain(|c| c == 'α');
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assert_eq!(s, "α");
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s.retain(|_| false);
|
||
assert_eq!(s, "");
|
||
|
||
let mut s = String::from("0è0");
|
||
let _ = panic::catch_unwind(panic::AssertUnwindSafe(|| {
|
||
let mut count = 0;
|
||
s.retain(|_| {
|
||
count += 1;
|
||
match count {
|
||
1 => false,
|
||
2 => true,
|
||
_ => panic!(),
|
||
}
|
||
});
|
||
}));
|
||
assert!(std::str::from_utf8(s.as_bytes()).is_ok());
|
||
}
|
||
|
||
#[test]
|
||
fn insert() {
|
||
let mut s = "foobar".to_string();
|
||
s.insert(0, 'ệ');
|
||
assert_eq!(s, "ệfoobar");
|
||
s.insert(6, 'ย');
|
||
assert_eq!(s, "ệfooยbar");
|
||
}
|
||
|
||
#[test]
|
||
#[should_panic]
|
||
fn insert_bad1() {
|
||
"".to_string().insert(1, 't');
|
||
}
|
||
#[test]
|
||
#[should_panic]
|
||
fn insert_bad2() {
|
||
"ệ".to_string().insert(1, 't');
|
||
}
|
||
|
||
#[test]
|
||
fn test_slicing() {
|
||
let s = "foobar".to_string();
|
||
assert_eq!("foobar", &s[..]);
|
||
assert_eq!("foo", &s[..3]);
|
||
assert_eq!("bar", &s[3..]);
|
||
assert_eq!("oob", &s[1..4]);
|
||
}
|
||
|
||
#[test]
|
||
fn test_simple_types() {
|
||
assert_eq!(1.to_string(), "1");
|
||
assert_eq!((-1).to_string(), "-1");
|
||
assert_eq!(200.to_string(), "200");
|
||
assert_eq!(2.to_string(), "2");
|
||
assert_eq!(true.to_string(), "true");
|
||
assert_eq!(false.to_string(), "false");
|
||
assert_eq!(("hi".to_string()).to_string(), "hi");
|
||
}
|
||
|
||
#[test]
|
||
fn test_vectors() {
|
||
let x: Vec<i32> = vec![];
|
||
assert_eq!(format!("{x:?}"), "[]");
|
||
assert_eq!(format!("{:?}", vec![1]), "[1]");
|
||
assert_eq!(format!("{:?}", vec![1, 2, 3]), "[1, 2, 3]");
|
||
assert!(format!("{:?}", vec![vec![], vec![1], vec![1, 1]]) == "[[], [1], [1, 1]]");
|
||
}
|
||
|
||
#[test]
|
||
fn test_from_iterator() {
|
||
let s = "ศไทย中华Việt Nam".to_string();
|
||
let t = "ศไทย中华";
|
||
let u = "Việt Nam";
|
||
|
||
let a: String = s.chars().collect();
|
||
assert_eq!(s, a);
|
||
|
||
let mut b = t.to_string();
|
||
b.extend(u.chars());
|
||
assert_eq!(s, b);
|
||
|
||
let c: String = [t, u].into_iter().collect();
|
||
assert_eq!(s, c);
|
||
|
||
let mut d = t.to_string();
|
||
d.extend(vec![u]);
|
||
assert_eq!(s, d);
|
||
}
|
||
|
||
#[test]
|
||
fn test_drain() {
|
||
let mut s = String::from("αβγ");
|
||
assert_eq!(s.drain(2..4).collect::<String>(), "β");
|
||
assert_eq!(s, "αγ");
|
||
|
||
let mut t = String::from("abcd");
|
||
t.drain(..0);
|
||
assert_eq!(t, "abcd");
|
||
t.drain(..1);
|
||
assert_eq!(t, "bcd");
|
||
t.drain(3..);
|
||
assert_eq!(t, "bcd");
|
||
t.drain(..);
|
||
assert_eq!(t, "");
|
||
}
|
||
|
||
#[test]
|
||
#[should_panic]
|
||
fn test_drain_start_overflow() {
|
||
let mut s = String::from("abc");
|
||
s.drain((Excluded(usize::MAX), Included(0)));
|
||
}
|
||
|
||
#[test]
|
||
#[should_panic]
|
||
fn test_drain_end_overflow() {
|
||
let mut s = String::from("abc");
|
||
s.drain((Included(0), Included(usize::MAX)));
|
||
}
|
||
|
||
#[test]
|
||
fn test_replace_range() {
|
||
let mut s = "Hello, world!".to_owned();
|
||
s.replace_range(7..12, "世界");
|
||
assert_eq!(s, "Hello, 世界!");
|
||
}
|
||
|
||
#[test]
|
||
#[should_panic]
|
||
fn test_replace_range_char_boundary() {
|
||
let mut s = "Hello, 世界!".to_owned();
|
||
s.replace_range(..8, "");
|
||
}
|
||
|
||
#[test]
|
||
fn test_replace_range_inclusive_range() {
|
||
let mut v = String::from("12345");
|
||
v.replace_range(2..=3, "789");
|
||
assert_eq!(v, "127895");
|
||
v.replace_range(1..=2, "A");
|
||
assert_eq!(v, "1A895");
|
||
}
|
||
|
||
#[test]
|
||
#[should_panic]
|
||
fn test_replace_range_out_of_bounds() {
|
||
let mut s = String::from("12345");
|
||
s.replace_range(5..6, "789");
|
||
}
|
||
|
||
#[test]
|
||
#[should_panic]
|
||
fn test_replace_range_inclusive_out_of_bounds() {
|
||
let mut s = String::from("12345");
|
||
s.replace_range(5..=5, "789");
|
||
}
|
||
|
||
#[test]
|
||
#[should_panic]
|
||
fn test_replace_range_start_overflow() {
|
||
let mut s = String::from("123");
|
||
s.replace_range((Excluded(usize::MAX), Included(0)), "");
|
||
}
|
||
|
||
#[test]
|
||
#[should_panic]
|
||
fn test_replace_range_end_overflow() {
|
||
let mut s = String::from("456");
|
||
s.replace_range((Included(0), Included(usize::MAX)), "");
|
||
}
|
||
|
||
#[test]
|
||
fn test_replace_range_empty() {
|
||
let mut s = String::from("12345");
|
||
s.replace_range(1..2, "");
|
||
assert_eq!(s, "1345");
|
||
}
|
||
|
||
#[test]
|
||
fn test_replace_range_unbounded() {
|
||
let mut s = String::from("12345");
|
||
s.replace_range(.., "");
|
||
assert_eq!(s, "");
|
||
}
|
||
|
||
#[test]
|
||
fn test_replace_range_evil_start_bound() {
|
||
struct EvilRange(Cell<bool>);
|
||
|
||
impl RangeBounds<usize> for EvilRange {
|
||
fn start_bound(&self) -> Bound<&usize> {
|
||
Bound::Included(if self.0.get() {
|
||
&1
|
||
} else {
|
||
self.0.set(true);
|
||
&0
|
||
})
|
||
}
|
||
fn end_bound(&self) -> Bound<&usize> {
|
||
Bound::Unbounded
|
||
}
|
||
}
|
||
|
||
let mut s = String::from("🦀");
|
||
s.replace_range(EvilRange(Cell::new(false)), "");
|
||
assert_eq!(Ok(""), str::from_utf8(s.as_bytes()));
|
||
}
|
||
|
||
#[test]
|
||
fn test_replace_range_evil_end_bound() {
|
||
struct EvilRange(Cell<bool>);
|
||
|
||
impl RangeBounds<usize> for EvilRange {
|
||
fn start_bound(&self) -> Bound<&usize> {
|
||
Bound::Included(&0)
|
||
}
|
||
fn end_bound(&self) -> Bound<&usize> {
|
||
Bound::Excluded(if self.0.get() {
|
||
&3
|
||
} else {
|
||
self.0.set(true);
|
||
&4
|
||
})
|
||
}
|
||
}
|
||
|
||
let mut s = String::from("🦀");
|
||
s.replace_range(EvilRange(Cell::new(false)), "");
|
||
assert_eq!(Ok(""), str::from_utf8(s.as_bytes()));
|
||
}
|
||
|
||
#[test]
|
||
fn test_extend_ref() {
|
||
let mut a = "foo".to_string();
|
||
a.extend(&['b', 'a', 'r']);
|
||
|
||
assert_eq!(&a, "foobar");
|
||
}
|
||
|
||
#[test]
|
||
fn test_into_boxed_str() {
|
||
let xs = String::from("hello my name is bob");
|
||
let ys = xs.into_boxed_str();
|
||
assert_eq!(&*ys, "hello my name is bob");
|
||
}
|
||
|
||
#[test]
|
||
fn test_reserve_exact() {
|
||
// This is all the same as test_reserve
|
||
|
||
let mut s = String::new();
|
||
assert_eq!(s.capacity(), 0);
|
||
|
||
s.reserve_exact(2);
|
||
assert!(s.capacity() >= 2);
|
||
|
||
for _i in 0..16 {
|
||
s.push('0');
|
||
}
|
||
|
||
assert!(s.capacity() >= 16);
|
||
s.reserve_exact(16);
|
||
assert!(s.capacity() >= 32);
|
||
|
||
s.push('0');
|
||
|
||
s.reserve_exact(16);
|
||
assert!(s.capacity() >= 33)
|
||
}
|
||
|
||
#[test]
|
||
#[cfg_attr(miri, ignore)] // Miri does not support signalling OOM
|
||
fn test_try_with_capacity() {
|
||
let string = String::try_with_capacity(1000).unwrap();
|
||
assert_eq!(0, string.len());
|
||
assert!(string.capacity() >= 1000 && string.capacity() <= isize::MAX as usize);
|
||
|
||
assert!(String::try_with_capacity(usize::MAX).is_err());
|
||
}
|
||
|
||
#[test]
|
||
#[cfg_attr(miri, ignore)] // Miri does not support signalling OOM
|
||
fn test_try_reserve() {
|
||
// These are the interesting cases:
|
||
// * exactly isize::MAX should never trigger a CapacityOverflow (can be OOM)
|
||
// * > isize::MAX should always fail
|
||
// * On 16/32-bit should CapacityOverflow
|
||
// * On 64-bit should OOM
|
||
// * overflow may trigger when adding `len` to `cap` (in number of elements)
|
||
// * overflow may trigger when multiplying `new_cap` by size_of::<T> (to get bytes)
|
||
|
||
const MAX_CAP: usize = isize::MAX as usize;
|
||
const MAX_USIZE: usize = usize::MAX;
|
||
|
||
{
|
||
// Note: basic stuff is checked by test_reserve
|
||
let mut empty_string: String = String::new();
|
||
|
||
// Check isize::MAX doesn't count as an overflow
|
||
if let Err(CapacityOverflow) = empty_string.try_reserve(MAX_CAP).map_err(|e| e.kind()) {
|
||
panic!("isize::MAX shouldn't trigger an overflow!");
|
||
}
|
||
// Play it again, frank! (just to be sure)
|
||
if let Err(CapacityOverflow) = empty_string.try_reserve(MAX_CAP).map_err(|e| e.kind()) {
|
||
panic!("isize::MAX shouldn't trigger an overflow!");
|
||
}
|
||
|
||
// Check isize::MAX + 1 does count as overflow
|
||
assert_matches!(
|
||
empty_string.try_reserve(MAX_CAP + 1).map_err(|e| e.kind()),
|
||
Err(CapacityOverflow),
|
||
"isize::MAX + 1 should trigger an overflow!"
|
||
);
|
||
|
||
// Check usize::MAX does count as overflow
|
||
assert_matches!(
|
||
empty_string.try_reserve(MAX_USIZE).map_err(|e| e.kind()),
|
||
Err(CapacityOverflow),
|
||
"usize::MAX should trigger an overflow!"
|
||
);
|
||
}
|
||
|
||
{
|
||
// Same basic idea, but with non-zero len
|
||
let mut ten_bytes: String = String::from("0123456789");
|
||
|
||
if let Err(CapacityOverflow) = ten_bytes.try_reserve(MAX_CAP - 10).map_err(|e| e.kind()) {
|
||
panic!("isize::MAX shouldn't trigger an overflow!");
|
||
}
|
||
if let Err(CapacityOverflow) = ten_bytes.try_reserve(MAX_CAP - 10).map_err(|e| e.kind()) {
|
||
panic!("isize::MAX shouldn't trigger an overflow!");
|
||
}
|
||
|
||
assert_matches!(
|
||
ten_bytes.try_reserve(MAX_CAP - 9).map_err(|e| e.kind()),
|
||
Err(CapacityOverflow),
|
||
"isize::MAX + 1 should trigger an overflow!"
|
||
);
|
||
|
||
// Should always overflow in the add-to-len
|
||
assert_matches!(
|
||
ten_bytes.try_reserve(MAX_USIZE).map_err(|e| e.kind()),
|
||
Err(CapacityOverflow),
|
||
"usize::MAX should trigger an overflow!"
|
||
);
|
||
}
|
||
}
|
||
|
||
#[test]
|
||
#[cfg_attr(miri, ignore)] // Miri does not support signalling OOM
|
||
fn test_try_reserve_exact() {
|
||
// This is exactly the same as test_try_reserve with the method changed.
|
||
// See that test for comments.
|
||
|
||
const MAX_CAP: usize = isize::MAX as usize;
|
||
const MAX_USIZE: usize = usize::MAX;
|
||
|
||
{
|
||
let mut empty_string: String = String::new();
|
||
|
||
if let Err(CapacityOverflow) = empty_string.try_reserve_exact(MAX_CAP).map_err(|e| e.kind())
|
||
{
|
||
panic!("isize::MAX shouldn't trigger an overflow!");
|
||
}
|
||
if let Err(CapacityOverflow) = empty_string.try_reserve_exact(MAX_CAP).map_err(|e| e.kind())
|
||
{
|
||
panic!("isize::MAX shouldn't trigger an overflow!");
|
||
}
|
||
|
||
assert_matches!(
|
||
empty_string.try_reserve_exact(MAX_CAP + 1).map_err(|e| e.kind()),
|
||
Err(CapacityOverflow),
|
||
"isize::MAX + 1 should trigger an overflow!"
|
||
);
|
||
|
||
assert_matches!(
|
||
empty_string.try_reserve_exact(MAX_USIZE).map_err(|e| e.kind()),
|
||
Err(CapacityOverflow),
|
||
"usize::MAX should trigger an overflow!"
|
||
);
|
||
}
|
||
|
||
{
|
||
let mut ten_bytes: String = String::from("0123456789");
|
||
|
||
if let Err(CapacityOverflow) =
|
||
ten_bytes.try_reserve_exact(MAX_CAP - 10).map_err(|e| e.kind())
|
||
{
|
||
panic!("isize::MAX shouldn't trigger an overflow!");
|
||
}
|
||
if let Err(CapacityOverflow) =
|
||
ten_bytes.try_reserve_exact(MAX_CAP - 10).map_err(|e| e.kind())
|
||
{
|
||
panic!("isize::MAX shouldn't trigger an overflow!");
|
||
}
|
||
|
||
assert_matches!(
|
||
ten_bytes.try_reserve_exact(MAX_CAP - 9).map_err(|e| e.kind()),
|
||
Err(CapacityOverflow),
|
||
"isize::MAX + 1 should trigger an overflow!"
|
||
);
|
||
|
||
assert_matches!(
|
||
ten_bytes.try_reserve_exact(MAX_USIZE).map_err(|e| e.kind()),
|
||
Err(CapacityOverflow),
|
||
"usize::MAX should trigger an overflow!"
|
||
);
|
||
}
|
||
}
|
||
|
||
#[test]
|
||
fn test_from_char() {
|
||
assert_eq!(String::from('a'), 'a'.to_string());
|
||
let s: String = 'x'.into();
|
||
assert_eq!(s, 'x'.to_string());
|
||
}
|
||
|
||
#[test]
|
||
fn test_str_concat() {
|
||
let a: String = "hello".to_string();
|
||
let b: String = "world".to_string();
|
||
let s: String = format!("{a}{b}");
|
||
assert_eq!(s.as_bytes()[9], 'd' as u8);
|
||
}
|