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-rw-r--r--src/liballoc/tests/string.rs723
1 files changed, 0 insertions, 723 deletions
diff --git a/src/liballoc/tests/string.rs b/src/liballoc/tests/string.rs
deleted file mode 100644
index d38655af78c..00000000000
--- a/src/liballoc/tests/string.rs
+++ /dev/null
@@ -1,723 +0,0 @@
-use std::borrow::Cow;
-use std::collections::TryReserveError::*;
-use std::mem::size_of;
-
-pub trait IntoCow<'a, B: ?Sized>
-where
- B: ToOwned,
-{
- fn into_cow(self) -> Cow<'a, B>;
-}
-
-impl<'a> IntoCow<'a, str> for String {
- fn into_cow(self) -> Cow<'a, str> {
- Cow::Owned(self)
- }
-}
-
-impl<'a> IntoCow<'a, str> for &'a str {
- fn into_cow(self) -> Cow<'a, str> {
- Cow::Borrowed(self)
- }
-}
-
-#[test]
-fn test_from_str() {
- let owned: Option<std::string::String> = "string".parse().ok();
- assert_eq!(owned.as_ref().map(|s| &**s), Some("string"));
-}
-
-#[test]
-fn test_from_cow_str() {
- assert_eq!(String::from(Cow::Borrowed("string")), "string");
- assert_eq!(String::from(Cow::Owned(String::from("string"))), "string");
-}
-
-#[test]
-fn test_unsized_to_string() {
- let s: &str = "abc";
- let _: String = (*s).to_string();
-}
-
-#[test]
-fn test_from_utf8() {
- let xs = b"hello".to_vec();
- assert_eq!(String::from_utf8(xs).unwrap(), String::from("hello"));
-
- let xs = "ศไทย中华Việt Nam".as_bytes().to_vec();
- assert_eq!(String::from_utf8(xs).unwrap(), String::from("ศไทย中华Việt Nam"));
-
- let xs = b"hello\xFF".to_vec();
- let err = String::from_utf8(xs).unwrap_err();
- assert_eq!(err.as_bytes(), b"hello\xff");
- let err_clone = err.clone();
- assert_eq!(err, err_clone);
- assert_eq!(err.into_bytes(), b"hello\xff".to_vec());
- assert_eq!(err_clone.utf8_error().valid_up_to(), 5);
-}
-
-#[test]
-fn test_from_utf8_lossy() {
- let xs = b"hello";
- let ys: Cow<'_, str> = "hello".into_cow();
- assert_eq!(String::from_utf8_lossy(xs), ys);
-
- let xs = "ศไทย中华Việt Nam".as_bytes();
- let ys: Cow<'_, str> = "ศไทย中华Việt Nam".into_cow();
- assert_eq!(String::from_utf8_lossy(xs), ys);
-
- let xs = b"Hello\xC2 There\xFF Goodbye";
- assert_eq!(
- String::from_utf8_lossy(xs),
- String::from("Hello\u{FFFD} There\u{FFFD} Goodbye").into_cow()
- );
-
- let xs = b"Hello\xC0\x80 There\xE6\x83 Goodbye";
- assert_eq!(
- String::from_utf8_lossy(xs),
- String::from("Hello\u{FFFD}\u{FFFD} There\u{FFFD} Goodbye").into_cow()
- );
-
- let xs = b"\xF5foo\xF5\x80bar";
- assert_eq!(
- String::from_utf8_lossy(xs),
- String::from("\u{FFFD}foo\u{FFFD}\u{FFFD}bar").into_cow()
- );
-
- let xs = b"\xF1foo\xF1\x80bar\xF1\x80\x80baz";
- assert_eq!(
- String::from_utf8_lossy(xs),
- String::from("\u{FFFD}foo\u{FFFD}bar\u{FFFD}baz").into_cow()
- );
-
- let xs = b"\xF4foo\xF4\x80bar\xF4\xBFbaz";
- assert_eq!(
- String::from_utf8_lossy(xs),
- String::from("\u{FFFD}foo\u{FFFD}bar\u{FFFD}\u{FFFD}baz").into_cow()
- );
-
- let xs = b"\xF0\x80\x80\x80foo\xF0\x90\x80\x80bar";
- assert_eq!(
- String::from_utf8_lossy(xs),
- String::from("\u{FFFD}\u{FFFD}\u{FFFD}\u{FFFD}foo\u{10000}bar").into_cow()
- );
-
- // surrogates
- let xs = b"\xED\xA0\x80foo\xED\xBF\xBFbar";
- assert_eq!(
- String::from_utf8_lossy(xs),
- String::from("\u{FFFD}\u{FFFD}\u{FFFD}foo\u{FFFD}\u{FFFD}\u{FFFD}bar").into_cow()
- );
-}
-
-#[test]
-fn test_from_utf16() {
- let pairs = [
- (
- String::from("𐍅𐌿𐌻𐍆𐌹𐌻𐌰\n"),
- vec![
- 0xd800, 0xdf45, 0xd800, 0xdf3f, 0xd800, 0xdf3b, 0xd800, 0xdf46, 0xd800, 0xdf39,
- 0xd800, 0xdf3b, 0xd800, 0xdf30, 0x000a,
- ],
- ),
- (
- String::from("𐐒𐑉𐐮𐑀𐐲𐑋 𐐏𐐲𐑍\n"),
- vec![
- 0xd801, 0xdc12, 0xd801, 0xdc49, 0xd801, 0xdc2e, 0xd801, 0xdc40, 0xd801, 0xdc32,
- 0xd801, 0xdc4b, 0x0020, 0xd801, 0xdc0f, 0xd801, 0xdc32, 0xd801, 0xdc4d, 0x000a,
- ],
- ),
- (
- String::from("𐌀𐌖𐌋𐌄𐌑𐌉·𐌌𐌄𐌕𐌄𐌋𐌉𐌑\n"),
- vec![
- 0xd800, 0xdf00, 0xd800, 0xdf16, 0xd800, 0xdf0b, 0xd800, 0xdf04, 0xd800, 0xdf11,
- 0xd800, 0xdf09, 0x00b7, 0xd800, 0xdf0c, 0xd800, 0xdf04, 0xd800, 0xdf15, 0xd800,
- 0xdf04, 0xd800, 0xdf0b, 0xd800, 0xdf09, 0xd800, 0xdf11, 0x000a,
- ],
- ),
- (
- String::from("𐒋𐒘𐒈𐒑𐒛𐒒 𐒕𐒓 𐒈𐒚𐒍 𐒏𐒜𐒒𐒖𐒆 𐒕𐒆\n"),
- vec![
- 0xd801, 0xdc8b, 0xd801, 0xdc98, 0xd801, 0xdc88, 0xd801, 0xdc91, 0xd801, 0xdc9b,
- 0xd801, 0xdc92, 0x0020, 0xd801, 0xdc95, 0xd801, 0xdc93, 0x0020, 0xd801, 0xdc88,
- 0xd801, 0xdc9a, 0xd801, 0xdc8d, 0x0020, 0xd801, 0xdc8f, 0xd801, 0xdc9c, 0xd801,
- 0xdc92, 0xd801, 0xdc96, 0xd801, 0xdc86, 0x0020, 0xd801, 0xdc95, 0xd801, 0xdc86,
- 0x000a,
- ],
- ),
- // Issue #12318, even-numbered non-BMP planes
- (String::from("\u{20000}"), vec![0xD840, 0xDC00]),
- ];
-
- for p in &pairs {
- let (s, u) = (*p).clone();
- let s_as_utf16 = s.encode_utf16().collect::<Vec<u16>>();
- let u_as_string = String::from_utf16(&u).unwrap();
-
- assert!(core::char::decode_utf16(u.iter().cloned()).all(|r| r.is_ok()));
- assert_eq!(s_as_utf16, u);
-
- assert_eq!(u_as_string, s);
- assert_eq!(String::from_utf16_lossy(&u), s);
-
- assert_eq!(String::from_utf16(&s_as_utf16).unwrap(), s);
- assert_eq!(u_as_string.encode_utf16().collect::<Vec<u16>>(), u);
- }
-}
-
-#[test]
-fn test_utf16_invalid() {
- // completely positive cases tested above.
- // lead + eof
- assert!(String::from_utf16(&[0xD800]).is_err());
- // lead + lead
- assert!(String::from_utf16(&[0xD800, 0xD800]).is_err());
-
- // isolated trail
- assert!(String::from_utf16(&[0x0061, 0xDC00]).is_err());
-
- // general
- assert!(String::from_utf16(&[0xD800, 0xd801, 0xdc8b, 0xD800]).is_err());
-}
-
-#[test]
-fn test_from_utf16_lossy() {
- // completely positive cases tested above.
- // lead + eof
- assert_eq!(String::from_utf16_lossy(&[0xD800]), String::from("\u{FFFD}"));
- // lead + lead
- assert_eq!(String::from_utf16_lossy(&[0xD800, 0xD800]), String::from("\u{FFFD}\u{FFFD}"));
-
- // isolated trail
- assert_eq!(String::from_utf16_lossy(&[0x0061, 0xDC00]), String::from("a\u{FFFD}"));
-
- // general
- assert_eq!(
- String::from_utf16_lossy(&[0xD800, 0xd801, 0xdc8b, 0xD800]),
- String::from("\u{FFFD}𐒋\u{FFFD}")
- );
-}
-
-#[test]
-fn test_push_bytes() {
- let mut s = String::from("ABC");
- unsafe {
- let mv = s.as_mut_vec();
- mv.extend_from_slice(&[b'D']);
- }
- assert_eq!(s, "ABCD");
-}
-
-#[test]
-fn test_push_str() {
- let mut s = String::new();
- s.push_str("");
- assert_eq!(&s[0..], "");
- s.push_str("abc");
- assert_eq!(&s[0..], "abc");
- s.push_str("ประเทศไทย中华Việt Nam");
- assert_eq!(&s[0..], "abcประเทศไทย中华Việt Nam");
-}
-
-#[test]
-fn test_add_assign() {
- let mut s = String::new();
- s += "";
- assert_eq!(s.as_str(), "");
- s += "abc";
- assert_eq!(s.as_str(), "abc");
- s += "ประเทศไทย中华Việt Nam";
- assert_eq!(s.as_str(), "abcประเทศไทย中华Việt Nam");
-}
-
-#[test]
-fn test_push() {
- let mut data = String::from("ประเทศไทย中");
- data.push('华');
- data.push('b'); // 1 byte
- data.push('¢'); // 2 byte
- data.push('€'); // 3 byte
- data.push('𤭢'); // 4 byte
- assert_eq!(data, "ประเทศไทย中华b¢€𤭢");
-}
-
-#[test]
-fn test_pop() {
- let mut data = String::from("ประเทศไทย中华b¢€𤭢");
- assert_eq!(data.pop().unwrap(), '𤭢'); // 4 bytes
- assert_eq!(data.pop().unwrap(), '€'); // 3 bytes
- assert_eq!(data.pop().unwrap(), '¢'); // 2 bytes
- assert_eq!(data.pop().unwrap(), 'b'); // 1 bytes
- assert_eq!(data.pop().unwrap(), '华');
- assert_eq!(data, "ประเทศไทย中");
-}
-
-#[test]
-fn test_split_off_empty() {
- let orig = "Hello, world!";
- let mut split = String::from(orig);
- let empty: String = split.split_off(orig.len());
- assert!(empty.is_empty());
-}
-
-#[test]
-#[should_panic]
-fn test_split_off_past_end() {
- let orig = "Hello, world!";
- let mut split = String::from(orig);
- let _ = split.split_off(orig.len() + 1);
-}
-
-#[test]
-#[should_panic]
-fn test_split_off_mid_char() {
- let mut orig = String::from("山");
- let _ = orig.split_off(1);
-}
-
-#[test]
-fn test_split_off_ascii() {
- let mut ab = String::from("ABCD");
- let cd = ab.split_off(2);
- assert_eq!(ab, "AB");
- assert_eq!(cd, "CD");
-}
-
-#[test]
-fn test_split_off_unicode() {
- let mut nihon = String::from("日本語");
- let go = nihon.split_off("日本".len());
- assert_eq!(nihon, "日本");
- assert_eq!(go, "語");
-}
-
-#[test]
-fn test_str_truncate() {
- let mut s = String::from("12345");
- s.truncate(5);
- assert_eq!(s, "12345");
- s.truncate(3);
- assert_eq!(s, "123");
- s.truncate(0);
- assert_eq!(s, "");
-
- let mut s = String::from("12345");
- let p = s.as_ptr();
- s.truncate(3);
- s.push_str("6");
- let p_ = s.as_ptr();
- assert_eq!(p_, p);
-}
-
-#[test]
-fn test_str_truncate_invalid_len() {
- let mut s = String::from("12345");
- s.truncate(6);
- assert_eq!(s, "12345");
-}
-
-#[test]
-#[should_panic]
-fn test_str_truncate_split_codepoint() {
- let mut s = String::from("\u{FC}"); // ü
- s.truncate(1);
-}
-
-#[test]
-fn test_str_clear() {
- let mut s = String::from("12345");
- s.clear();
- assert_eq!(s.len(), 0);
- assert_eq!(s, "");
-}
-
-#[test]
-fn test_str_add() {
- let a = String::from("12345");
- let b = a + "2";
- let b = b + "2";
- assert_eq!(b.len(), 7);
- assert_eq!(b, "1234522");
-}
-
-#[test]
-fn remove() {
- let mut s = "ศไทย中华Việt Nam; foobar".to_string();
- assert_eq!(s.remove(0), 'ศ');
- assert_eq!(s.len(), 33);
- assert_eq!(s, "ไทย中华Việt Nam; foobar");
- assert_eq!(s.remove(17), 'ệ');
- assert_eq!(s, "ไทย中华Vit Nam; foobar");
-}
-
-#[test]
-#[should_panic]
-fn remove_bad() {
- "ศ".to_string().remove(1);
-}
-
-#[test]
-fn test_retain() {
- let mut s = String::from("α_β_γ");
-
- s.retain(|_| true);
- assert_eq!(s, "α_β_γ");
-
- s.retain(|c| c != '_');
- assert_eq!(s, "αβγ");
-
- s.retain(|c| c != 'β');
- assert_eq!(s, "αγ");
-
- s.retain(|c| c == 'α');
- assert_eq!(s, "α");
-
- s.retain(|_| false);
- assert_eq!(s, "");
-}
-
-#[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 = vec![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]
-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]
-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_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
-#[cfg_attr(target_os = "android", ignore)] // Android used in CI has a broken dlmalloc
-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;
-
- // On 16/32-bit, we check that allocations don't exceed isize::MAX,
- // on 64-bit, we assume the OS will give an OOM for such a ridiculous size.
- // Any platform that succeeds for these requests is technically broken with
- // ptr::offset because LLVM is the worst.
- let guards_against_isize = size_of::<usize>() < 8;
-
- {
- // 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) {
- 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) {
- panic!("isize::MAX shouldn't trigger an overflow!");
- }
-
- if guards_against_isize {
- // Check isize::MAX + 1 does count as overflow
- if let Err(CapacityOverflow) = empty_string.try_reserve(MAX_CAP + 1) {
- } else {
- panic!("isize::MAX + 1 should trigger an overflow!")
- }
-
- // Check usize::MAX does count as overflow
- if let Err(CapacityOverflow) = empty_string.try_reserve(MAX_USIZE) {
- } else {
- panic!("usize::MAX should trigger an overflow!")
- }
- } else {
- // Check isize::MAX + 1 is an OOM
- if let Err(AllocError { .. }) = empty_string.try_reserve(MAX_CAP + 1) {
- } else {
- panic!("isize::MAX + 1 should trigger an OOM!")
- }
-
- // Check usize::MAX is an OOM
- if let Err(AllocError { .. }) = empty_string.try_reserve(MAX_USIZE) {
- } else {
- panic!("usize::MAX should trigger an OOM!")
- }
- }
- }
-
- {
- // 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) {
- panic!("isize::MAX shouldn't trigger an overflow!");
- }
- if let Err(CapacityOverflow) = ten_bytes.try_reserve(MAX_CAP - 10) {
- panic!("isize::MAX shouldn't trigger an overflow!");
- }
- if guards_against_isize {
- if let Err(CapacityOverflow) = ten_bytes.try_reserve(MAX_CAP - 9) {
- } else {
- panic!("isize::MAX + 1 should trigger an overflow!");
- }
- } else {
- if let Err(AllocError { .. }) = ten_bytes.try_reserve(MAX_CAP - 9) {
- } else {
- panic!("isize::MAX + 1 should trigger an OOM!")
- }
- }
- // Should always overflow in the add-to-len
- if let Err(CapacityOverflow) = ten_bytes.try_reserve(MAX_USIZE) {
- } else {
- panic!("usize::MAX should trigger an overflow!")
- }
- }
-}
-
-#[test]
-#[cfg_attr(miri, ignore)] // Miri does not support signalling OOM
-#[cfg_attr(target_os = "android", ignore)] // Android used in CI has a broken dlmalloc
-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 guards_against_isize = size_of::<usize>() < 8;
-
- {
- let mut empty_string: String = String::new();
-
- if let Err(CapacityOverflow) = empty_string.try_reserve_exact(MAX_CAP) {
- panic!("isize::MAX shouldn't trigger an overflow!");
- }
- if let Err(CapacityOverflow) = empty_string.try_reserve_exact(MAX_CAP) {
- panic!("isize::MAX shouldn't trigger an overflow!");
- }
-
- if guards_against_isize {
- if let Err(CapacityOverflow) = empty_string.try_reserve_exact(MAX_CAP + 1) {
- } else {
- panic!("isize::MAX + 1 should trigger an overflow!")
- }
-
- if let Err(CapacityOverflow) = empty_string.try_reserve_exact(MAX_USIZE) {
- } else {
- panic!("usize::MAX should trigger an overflow!")
- }
- } else {
- if let Err(AllocError { .. }) = empty_string.try_reserve_exact(MAX_CAP + 1) {
- } else {
- panic!("isize::MAX + 1 should trigger an OOM!")
- }
-
- if let Err(AllocError { .. }) = empty_string.try_reserve_exact(MAX_USIZE) {
- } else {
- panic!("usize::MAX should trigger an OOM!")
- }
- }
- }
-
- {
- let mut ten_bytes: String = String::from("0123456789");
-
- if let Err(CapacityOverflow) = ten_bytes.try_reserve_exact(MAX_CAP - 10) {
- panic!("isize::MAX shouldn't trigger an overflow!");
- }
- if let Err(CapacityOverflow) = ten_bytes.try_reserve_exact(MAX_CAP - 10) {
- panic!("isize::MAX shouldn't trigger an overflow!");
- }
- if guards_against_isize {
- if let Err(CapacityOverflow) = ten_bytes.try_reserve_exact(MAX_CAP - 9) {
- } else {
- panic!("isize::MAX + 1 should trigger an overflow!");
- }
- } else {
- if let Err(AllocError { .. }) = ten_bytes.try_reserve_exact(MAX_CAP - 9) {
- } else {
- panic!("isize::MAX + 1 should trigger an OOM!")
- }
- }
- if let Err(CapacityOverflow) = ten_bytes.try_reserve_exact(MAX_USIZE) {
- } else {
- panic!("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());
-}
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