use std::borrow::Cow;
use std::cmp::Ordering::{Equal, Greater, Less};
use std::str::from_utf8;
#[test]
fn test_le() {
assert!("" <= "");
assert!("" <= "foo");
assert!("foo" <= "foo");
assert_ne!("foo", "bar");
}
#[test]
fn test_find() {
assert_eq!("hello".find('l'), Some(2));
assert_eq!("hello".find(|c: char| c == 'o'), Some(4));
assert!("hello".find('x').is_none());
assert!("hello".find(|c: char| c == 'x').is_none());
assert_eq!("ประเทศไทย中华Việt Nam".find('华'), Some(30));
assert_eq!("ประเทศไทย中华Việt Nam".find(|c: char| c == '华'), Some(30));
}
#[test]
fn test_rfind() {
assert_eq!("hello".rfind('l'), Some(3));
assert_eq!("hello".rfind(|c: char| c == 'o'), Some(4));
assert!("hello".rfind('x').is_none());
assert!("hello".rfind(|c: char| c == 'x').is_none());
assert_eq!("ประเทศไทย中华Việt Nam".rfind('华'), Some(30));
assert_eq!("ประเทศไทย中华Việt Nam".rfind(|c: char| c == '华'), Some(30));
}
#[test]
fn test_collect() {
let empty = "";
let s: String = empty.chars().collect();
assert_eq!(empty, s);
let data = "ประเทศไทย中";
let s: String = data.chars().collect();
assert_eq!(data, s);
}
#[test]
fn test_into_bytes() {
let data = String::from("asdf");
let buf = data.into_bytes();
assert_eq!(buf, b"asdf");
}
#[test]
fn test_find_str() {
// byte positions
assert_eq!("".find(""), Some(0));
assert!("banana".find("apple pie").is_none());
let data = "abcabc";
assert_eq!(data[0..6].find("ab"), Some(0));
assert_eq!(data[2..6].find("ab"), Some(3 - 2));
assert!(data[2..4].find("ab").is_none());
let string = "ประเทศไทย中华Việt Nam";
let mut data = String::from(string);
data.push_str(string);
assert!(data.find("ไท华").is_none());
assert_eq!(data[0..43].find(""), Some(0));
assert_eq!(data[6..43].find(""), Some(6 - 6));
assert_eq!(data[0..43].find("ประ"), Some(0));
assert_eq!(data[0..43].find("ทศไ"), Some(12));
assert_eq!(data[0..43].find("ย中"), Some(24));
assert_eq!(data[0..43].find("iệt"), Some(34));
assert_eq!(data[0..43].find("Nam"), Some(40));
assert_eq!(data[43..86].find("ประ"), Some(43 - 43));
assert_eq!(data[43..86].find("ทศไ"), Some(55 - 43));
assert_eq!(data[43..86].find("ย中"), Some(67 - 43));
assert_eq!(data[43..86].find("iệt"), Some(77 - 43));
assert_eq!(data[43..86].find("Nam"), Some(83 - 43));
// find every substring -- assert that it finds it, or an earlier occurrence.
let string = "Việt Namacbaabcaabaaba";
for (i, ci) in string.char_indices() {
let ip = i + ci.len_utf8();
for j in string[ip..].char_indices().map(|(i, _)| i).chain(Some(string.len() - ip)) {
let pat = &string[i..ip + j];
assert!(match string.find(pat) {
None => false,
Some(x) => x <= i,
});
assert!(match string.rfind(pat) {
None => false,
Some(x) => x >= i,
});
}
}
}
fn s(x: &str) -> String {
x.to_string()
}
macro_rules! test_concat {
($expected: expr, $string: expr) => {{
let s: String = $string.concat();
assert_eq!($expected, s);
}};
}
#[test]
fn test_concat_for_different_types() {
test_concat!("ab", vec![s("a"), s("b")]);
test_concat!("ab", vec!["a", "b"]);
}
#[test]
fn test_concat_for_different_lengths() {
let empty: &[&str] = &[];
test_concat!("", empty);
test_concat!("a", ["a"]);
test_concat!("ab", ["a", "b"]);
test_concat!("abc", ["", "a", "bc"]);
}
macro_rules! test_join {
($expected: expr, $string: expr, $delim: expr) => {{
let s = $string.join($delim);
assert_eq!($expected, s);
}};
}
#[test]
fn test_join_for_different_types() {
test_join!("a-b", ["a", "b"], "-");
let hyphen = "-".to_string();
test_join!("a-b", [s("a"), s("b")], &*hyphen);
test_join!("a-b", vec!["a", "b"], &*hyphen);
test_join!("a-b", &*vec!["a", "b"], "-");
test_join!("a-b", vec![s("a"), s("b")], "-");
}
#[test]
fn test_join_for_different_lengths() {
let empty: &[&str] = &[];
test_join!("", empty, "-");
test_join!("a", ["a"], "-");
test_join!("a-b", ["a", "b"], "-");
test_join!("-a-bc", ["", "a", "bc"], "-");
}
// join has fast paths for small separators up to 4 bytes
// this tests the slow paths.
#[test]
fn test_join_for_different_lengths_with_long_separator() {
assert_eq!("～～～～～".len(), 15);
let empty: &[&str] = &[];
test_join!("", empty, "～～～～～");
test_join!("a", ["a"], "～～～～～");
test_join!("a～～～～～b", ["a", "b"], "～～～～～");
test_join!("～～～～～a～～～～～bc", ["", "a", "bc"], "～～～～～");
}
#[test]
#[cfg_attr(miri, ignore)] // Miri is too slow
fn test_unsafe_slice() {
assert_eq!("ab", unsafe { "abc".get_unchecked(0..2) });
assert_eq!("bc", unsafe { "abc".get_unchecked(1..3) });
assert_eq!("", unsafe { "abc".get_unchecked(1..1) });
fn a_million_letter_a() -> String {
let mut i = 0;
let mut rs = String::new();
while i < 100000 {
rs.push_str("aaaaaaaaaa");
i += 1;
}
rs
}
fn half_a_million_letter_a() -> String {
let mut i = 0;
let mut rs = String::new();
while i < 100000 {
rs.push_str("aaaaa");
i += 1;
}
rs
}
let letters = a_million_letter_a();
assert_eq!(half_a_million_letter_a(), unsafe { letters.get_unchecked(0..500000) });
}
#[test]
fn test_starts_with() {
assert!("".starts_with(""));
assert!("abc".starts_with(""));
assert!("abc".starts_with("a"));
assert!(!"a".starts_with("abc"));
assert!(!"".starts_with("abc"));
assert!(!"ödd".starts_with("-"));
assert!("ödd".starts_with("öd"));
}
#[test]
fn test_ends_with() {
assert!("".ends_with(""));
assert!("abc".ends_with(""));
assert!("abc".ends_with("c"));
assert!(!"a".ends_with("abc"));
assert!(!"".ends_with("abc"));
assert!(!"ddö".ends_with("-"));
assert!("ddö".ends_with("dö"));
}
#[test]
fn test_is_empty() {
assert!("".is_empty());
assert!(!"a".is_empty());
}
#[test]
fn test_replacen() {
assert_eq!("".replacen('a', "b", 5), "");
assert_eq!("acaaa".replacen("a", "b", 3), "bcbba");
assert_eq!("aaaa".replacen("a", "b", 0), "aaaa");
let test = "test";
assert_eq!(" test test ".replacen(test, "toast", 3), " toast toast ");
assert_eq!(" test test ".replacen(test, "toast", 0), " test test ");
assert_eq!(" test test ".replacen(test, "", 5), " ");
assert_eq!("qwer123zxc789".replacen(char::is_numeric, "", 3), "qwerzxc789");
}
#[test]
fn test_replace() {
let a = "a";
assert_eq!("".replace(a, "b"), "");
assert_eq!("a".replace(a, "b"), "b");
assert_eq!("ab".replace(a, "b"), "bb");
let test = "test";
assert_eq!(" test test ".replace(test, "toast"), " toast toast ");
assert_eq!(" test test ".replace(test, ""), " ");
}
#[test]
fn test_replace_2a() {
let data = "ประเทศไทย中华";
let repl = "دولة الكويت";
let a = "ประเ";
let a2 = "دولة الكويتทศไทย中华";
assert_eq!(data.replace(a, repl), a2);
}
#[test]
fn test_replace_2b() {
let data = "ประเทศไทย中华";
let repl = "دولة الكويت";
let b = "ะเ";
let b2 = "ปรدولة الكويتทศไทย中华";
assert_eq!(data.replace(b, repl), b2);
}
#[test]
fn test_replace_2c() {
let data = "ประเทศไทย中华";
let repl = "دولة الكويت";
let c = "中华";
let c2 = "ประเทศไทยدولة الكويت";
assert_eq!(data.replace(c, repl), c2);
}
#[test]
fn test_replace_2d() {
let data = "ประเทศไทย中华";
let repl = "دولة الكويت";
let d = "ไท华";
assert_eq!(data.replace(d, repl), data);
}
#[test]
fn test_replace_pattern() {
let data = "abcdαβγδabcdαβγδ";
assert_eq!(data.replace("dαβ", "😺😺😺"), "abc😺😺😺γδabc😺😺😺γδ");
assert_eq!(data.replace('γ', "😺😺😺"), "abcdαβ😺😺😺δabcdαβ😺😺😺δ");
assert_eq!(data.replace(&['a', 'γ'] as &[_], "😺😺😺"), "😺😺😺bcdαβ😺😺😺δ😺😺😺bcdαβ😺😺😺δ");
assert_eq!(data.replace(|c| c == 'γ', "😺😺😺"), "abcdαβ😺😺😺δabcdαβ😺😺😺δ");
}
// The current implementation of SliceIndex fails to handle methods
// orthogonally from range types; therefore, it is worth testing
// all of the indexing operations on each input.
mod slice_index {
// Test a slicing operation **that should succeed,**
// testing it on all of the indexing methods.
//
// This is not suitable for testing failure on invalid inputs.
macro_rules! assert_range_eq {
($s:expr, $range:expr, $expected:expr) => {
let mut s: String = $s.to_owned();
let mut expected: String = $expected.to_owned();
{
let s: &str = &s;
let expected: &str = &expected;
assert_eq!(&s[$range], expected, "(in assertion for: index)");
assert_eq!(s.get($range), Some(expected), "(in assertion for: get)");
unsafe {
assert_eq!(
s.get_unchecked($range),
expected,
"(in assertion for: get_unchecked)",
);
}
}
{
let s: &mut str = &mut s;
let expected: &mut str = &mut expected;
assert_eq!(&mut s[$range], expected, "(in assertion for: index_mut)",);
assert_eq!(
s.get_mut($range),
Some(&mut expected[..]),
"(in assertion for: get_mut)",
);
unsafe {
assert_eq!(
s.get_unchecked_mut($range),
expected,
"(in assertion for: get_unchecked_mut)",
);
}
}
};
}
// Make sure the macro can actually detect bugs,
// because if it can't, then what are we even doing here?
//
// (Be aware this only demonstrates the ability to detect bugs
// in the FIRST method that panics, as the macro is not designed
// to be used in `should_panic`)
#[test]
#[should_panic(expected = "out of bounds")]
fn assert_range_eq_can_fail_by_panic() {
assert_range_eq!("abc", 0..5, "abc");
}
// (Be aware this only demonstrates the ability to detect bugs
// in the FIRST method it calls, as the macro is not designed
// to be used in `should_panic`)
#[test]
#[should_panic(expected = "==")]
fn assert_range_eq_can_fail_by_inequality() {
assert_range_eq!("abc", 0..2, "abc");
}
// Generates test cases for bad index operations.
//
// This generates `should_panic` test cases for Index/IndexMut
// and `None` test cases for get/get_mut.
macro_rules! panic_cases {
($(
in mod $case_name:ident {
data: $data:expr;
// optional:
//
// a similar input for which DATA[input] succeeds, and the corresponding
// output str. This helps validate "critical points" where an input range
// straddles the boundary between valid and invalid.
// (such as the input `len..len`, which is just barely valid)
$(
good: data[$good:expr] == $output:expr;
)*
bad: data[$bad:expr];
message: $expect_msg:expr; // must be a literal
}
)*) => {$(
mod $case_name {
#[test]
fn pass() {
let mut v: String = $data.into();
$( assert_range_eq!(v, $good, $output); )*
{
let v: &str = &v;
assert_eq!(v.get($bad), None, "(in None assertion for get)");
}
{
let v: &mut str = &mut v;
assert_eq!(v.get_mut($bad), None, "(in None assertion for get_mut)");
}
}
#[test]
#[should_panic(expected = $expect_msg)]
fn index_fail() {
let v: String = $data.into();
let v: &str = &v;
let _v = &v[$bad];
}
#[test]
#[should_panic(expected = $expect_msg)]
fn index_mut_fail() {
let mut v: String = $data.into();
let v: &mut str = &mut v;
let _v = &mut v[$bad];
}
}
)*};
}
#[test]
fn simple_ascii() {
assert_range_eq!("abc", .., "abc");
assert_range_eq!("abc", 0..2, "ab");
assert_range_eq!("abc", 0..=1, "ab");
assert_range_eq!("abc", ..2, "ab");
assert_range_eq!("abc", ..=1, "ab");
assert_range_eq!("abc", 1..3, "bc");
assert_range_eq!("abc", 1..=2, "bc");
assert_range_eq!("abc", 1..1, "");
assert_range_eq!("abc", 1..=0, "");
}
#[test]
fn simple_unicode() {
// 日本
assert_range_eq!("\u{65e5}\u{672c}", .., "\u{65e5}\u{672c}");
assert_range_eq!("\u{65e5}\u{672c}", 0..3, "\u{65e5}");
assert_range_eq!("\u{65e5}\u{672c}", 0..=2, "\u{65e5}");
assert_range_eq!("\u{65e5}\u{672c}", ..3, "\u{65e5}");
assert_range_eq!("\u{65e5}\u{672c}", ..=2, "\u{65e5}");
assert_range_eq!("\u{65e5}\u{672c}", 3..6, "\u{672c}");
assert_range_eq!("\u{65e5}\u{672c}", 3..=5, "\u{672c}");
assert_range_eq!("\u{65e5}\u{672c}", 3.., "\u{672c}");
let data = "ประเทศไทย中华";
assert_range_eq!(data, 0..3, "ป");
assert_range_eq!(data, 3..6, "ร");
assert_range_eq!(data, 3..3, "");
assert_range_eq!(data, 30..33, "华");
/*0: 中
3: 华
6: V
7: i
8: ệ
11: t
12:
13: N
14: a
15: m */
let ss = "中华Việt Nam";
assert_range_eq!(ss, 3..6, "华");
assert_range_eq!(ss, 6..16, "Việt Nam");
assert_range_eq!(ss, 6..=15, "Việt Nam");
assert_range_eq!(ss, 6.., "Việt Nam");
assert_range_eq!(ss, 0..3, "中");
assert_range_eq!(ss, 3..7, "华V");
assert_range_eq!(ss, 3..=6, "华V");
assert_range_eq!(ss, 3..3, "");
assert_range_eq!(ss, 3..=2, "");
}
#[test]
#[cfg_attr(target_os = "emscripten", ignore)] // hits an OOM
#[cfg_attr(miri, ignore)] // Miri is too slow
fn simple_big() {
fn a_million_letter_x() -> String {
let mut i = 0;
let mut rs = String::new();
while i < 100000 {
rs.push_str("华华华华华华华华华华");
i += 1;
}
rs
}
fn half_a_million_letter_x() -> String {
let mut i = 0;
let mut rs = String::new();
while i < 100000 {
rs.push_str("华华华华华");
i += 1;
}
rs
}
let letters = a_million_letter_x();
assert_range_eq!(letters, 0..3 * 500000, half_a_million_letter_x());
}
#[test]
#[should_panic]
fn test_slice_fail() {
&"中华Việt Nam"[0..2];
}
panic_cases! {
in mod rangefrom_len {
data: "abcdef";
good: data[6..] == "";
bad: data[7..];
message: "out of bounds";
}
in mod rangeto_len {
data: "abcdef";
good: data[..6] == "abcdef";
bad: data[..7];
message: "out of bounds";
}
in mod rangetoinclusive_len {
data: "abcdef";
good: data[..=5] == "abcdef";
bad: data[..=6];
message: "out of bounds";
}
in mod range_len_len {
data: "abcdef";
good: data[6..6] == "";
bad: data[7..7];
message: "out of bounds";
}
in mod rangeinclusive_len_len {
data: "abcdef";
good: data[6..=5] == "";
bad: data[7..=6];
message: "out of bounds";
}
}
panic_cases! {
in mod range_neg_width {
data: "abcdef";
good: data[4..4] == "";
bad: data[4..3];
message: "begin <= end (4 <= 3)";
}
in mod rangeinclusive_neg_width {
data: "abcdef";
good: data[4..=3] == "";
bad: data[4..=2];
message: "begin <= end (4 <= 3)";
}
}
mod overflow {
panic_cases! {
in mod rangeinclusive {
data: "hello";
// note: using 0 specifically ensures that the result of overflowing is 0..0,
// so that `get` doesn't simply return None for the wrong reason.
bad: data[0..=usize::MAX];
message: "maximum usize";
}
in mod rangetoinclusive {
data: "hello";
bad: data[..=usize::MAX];
message: "maximum usize";
}
}
}
mod boundary {
const DATA: &str = "abcαβγ";
const BAD_START: usize = 4;
const GOOD_START: usize = 3;
const BAD_END: usize = 6;
const GOOD_END: usize = 7;
const BAD_END_INCL: usize = BAD_END - 1;
const GOOD_END_INCL: usize = GOOD_END - 1;
// it is especially important to test all of the different range types here
// because some of the logic may be duplicated as part of micro-optimizations
// to dodge unicode boundary checks on half-ranges.
panic_cases! {
in mod range_1 {
data: super::DATA;
bad: data[super::BAD_START..super::GOOD_END];
message:
"byte index 4 is not a char boundary; it is inside 'α' (bytes 3..5) of";
}
in mod range_2 {
data: super::DATA;
bad: data[super::GOOD_START..super::BAD_END];
message:
"byte index 6 is not a char boundary; it is inside 'β' (bytes 5..7) of";
}
in mod rangefrom {
data: super::DATA;
bad: data[super::BAD_START..];
message:
"byte index 4 is not a char boundary; it is inside 'α' (bytes 3..5) of";
}
in mod rangeto {
data: super::DATA;
bad: data[..super::BAD_END];
message:
"byte index 6 is not a char boundary; it is inside 'β' (bytes 5..7) of";
}
in mod rangeinclusive_1 {
data: super::DATA;
bad: data[super::BAD_START..=super::GOOD_END_INCL];
message:
"byte index 4 is not a char boundary; it is inside 'α' (bytes 3..5) of";
}
in mod rangeinclusive_2 {
data: super::DATA;
bad: data[super::GOOD_START..=super::BAD_END_INCL];
message:
"byte index 6 is not a char boundary; it is inside 'β' (bytes 5..7) of";
}
in mod rangetoinclusive {
data: super::DATA;
bad: data[..=super::BAD_END_INCL];
message:
"byte index 6 is not a char boundary; it is inside 'β' (bytes 5..7) of";
}
}
}
const LOREM_PARAGRAPH: &str = "\
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Suspendisse quis lorem \
sit amet dolor ultricies condimentum. Praesent iaculis purus elit, ac malesuada \
quam malesuada in. Duis sed orci eros. Suspendisse sit amet magna mollis, mollis \
nunc luctus, imperdiet mi. Integer fringilla non sem ut lacinia. Fusce varius \
tortor a risus porttitor hendrerit. Morbi mauris dui, ultricies nec tempus vel, \
gravida nec quam.";
// check the panic includes the prefix of the sliced string
#[test]
#[should_panic(expected = "byte index 1024 is out of bounds of `Lorem ipsum dolor sit amet")]
fn test_slice_fail_truncated_1() {
&LOREM_PARAGRAPH[..1024];
}
// check the truncation in the panic message
#[test]
#[should_panic(expected = "luctus, im`[...]")]
fn test_slice_fail_truncated_2() {
&LOREM_PARAGRAPH[..1024];
}
}
#[test]
fn test_str_slice_rangetoinclusive_ok() {
let s = "abcαβγ";
assert_eq!(&s[..=2], "abc");
assert_eq!(&s[..=4], "abcα");
}
#[test]
#[should_panic]
fn test_str_slice_rangetoinclusive_notok() {
let s = "abcαβγ";
&s[..=3];
}
#[test]
fn test_str_slicemut_rangetoinclusive_ok() {
let mut s = "abcαβγ".to_owned();
let s: &mut str = &mut s;
assert_eq!(&mut s[..=2], "abc");
assert_eq!(&mut s[..=4], "abcα");
}
#[test]
#[should_panic]
fn test_str_slicemut_rangetoinclusive_notok() {
let mut s = "abcαβγ".to_owned();
let s: &mut str = &mut s;
&mut s[..=3];
}
#[test]
fn test_is_char_boundary() {
let s = "ศไทย中华Việt Nam β-release 🐱123";
assert!(s.is_char_boundary(0));
assert!(s.is_char_boundary(s.len()));
assert!(!s.is_char_boundary(s.len() + 1));
for (i, ch) in s.char_indices() {
// ensure character locations are boundaries and continuation bytes are not
assert!(s.is_char_boundary(i), "{} is a char boundary in {:?}", i, s);
for j in 1..ch.len_utf8() {
assert!(
!s.is_char_boundary(i + j),
"{} should not be a char boundary in {:?}",
i + j,
s
);
}
}
}
#[test]
fn test_trim_start_matches() {
let v: &[char] = &[];
assert_eq!(" *** foo *** ".trim_start_matches(v), " *** foo *** ");
let chars: &[char] = &['*', ' '];
assert_eq!(" *** foo *** ".trim_start_matches(chars), "foo *** ");
assert_eq!(" *** *** ".trim_start_matches(chars), "");
assert_eq!("foo *** ".trim_start_matches(chars), "foo *** ");
assert_eq!("11foo1bar11".trim_start_matches('1'), "foo1bar11");
let chars: &[char] = &['1', '2'];
assert_eq!("12foo1bar12".trim_start_matches(chars), "foo1bar12");
assert_eq!("123foo1bar123".trim_start_matches(|c: char| c.is_numeric()), "foo1bar123");
}
#[test]
fn test_trim_end_matches() {
let v: &[char] = &[];
assert_eq!(" *** foo *** ".trim_end_matches(v), " *** foo *** ");
let chars: &[char] = &['*', ' '];
assert_eq!(" *** foo *** ".trim_end_matches(chars), " *** foo");
assert_eq!(" *** *** ".trim_end_matches(chars), "");
assert_eq!(" *** foo".trim_end_matches(chars), " *** foo");
assert_eq!("11foo1bar11".trim_end_matches('1'), "11foo1bar");
let chars: &[char] = &['1', '2'];
assert_eq!("12foo1bar12".trim_end_matches(chars), "12foo1bar");
assert_eq!("123foo1bar123".trim_end_matches(|c: char| c.is_numeric()), "123foo1bar");
}
#[test]
fn test_trim_matches() {
let v: &[char] = &[];
assert_eq!(" *** foo *** ".trim_matches(v), " *** foo *** ");
let chars: &[char] = &['*', ' '];
assert_eq!(" *** foo *** ".trim_matches(chars), "foo");
assert_eq!(" *** *** ".trim_matches(chars), "");
assert_eq!("foo".trim_matches(chars), "foo");
assert_eq!("11foo1bar11".trim_matches('1'), "foo1bar");
let chars: &[char] = &['1', '2'];
assert_eq!("12foo1bar12".trim_matches(chars), "foo1bar");
assert_eq!("123foo1bar123".trim_matches(|c: char| c.is_numeric()), "foo1bar");
}
#[test]
fn test_trim_start() {
assert_eq!("".trim_start(), "");
assert_eq!("a".trim_start(), "a");
assert_eq!(" ".trim_start(), "");
assert_eq!(" blah".trim_start(), "blah");
assert_eq!(" \u{3000} wut".trim_start(), "wut");
assert_eq!("hey ".trim_start(), "hey ");
}
#[test]
fn test_trim_end() {
assert_eq!("".trim_end(), "");
assert_eq!("a".trim_end(), "a");
assert_eq!(" ".trim_end(), "");
assert_eq!("blah ".trim_end(), "blah");
assert_eq!("wut \u{3000} ".trim_end(), "wut");
assert_eq!(" hey".trim_end(), " hey");
}
#[test]
fn test_trim() {
assert_eq!("".trim(), "");
assert_eq!("a".trim(), "a");
assert_eq!(" ".trim(), "");
assert_eq!(" blah ".trim(), "blah");
assert_eq!("\nwut \u{3000} ".trim(), "wut");
assert_eq!(" hey dude ".trim(), "hey dude");
}
#[test]
fn test_is_whitespace() {
assert!("".chars().all(|c| c.is_whitespace()));
assert!(" ".chars().all(|c| c.is_whitespace()));
assert!("\u{2009}".chars().all(|c| c.is_whitespace())); // Thin space
assert!(" \n\t ".chars().all(|c| c.is_whitespace()));
assert!(!" _ ".chars().all(|c| c.is_whitespace()));
}
#[test]
fn test_is_utf8() {
// deny overlong encodings
assert!(from_utf8(&[0xc0, 0x80]).is_err());
assert!(from_utf8(&[0xc0, 0xae]).is_err());
assert!(from_utf8(&[0xe0, 0x80, 0x80]).is_err());
assert!(from_utf8(&[0xe0, 0x80, 0xaf]).is_err());
assert!(from_utf8(&[0xe0, 0x81, 0x81]).is_err());
assert!(from_utf8(&[0xf0, 0x82, 0x82, 0xac]).is_err());
assert!(from_utf8(&[0xf4, 0x90, 0x80, 0x80]).is_err());
// deny surrogates
assert!(from_utf8(&[0xED, 0xA0, 0x80]).is_err());
assert!(from_utf8(&[0xED, 0xBF, 0xBF]).is_err());
assert!(from_utf8(&[0xC2, 0x80]).is_ok());
assert!(from_utf8(&[0xDF, 0xBF]).is_ok());
assert!(from_utf8(&[0xE0, 0xA0, 0x80]).is_ok());
assert!(from_utf8(&[0xED, 0x9F, 0xBF]).is_ok());
assert!(from_utf8(&[0xEE, 0x80, 0x80]).is_ok());
assert!(from_utf8(&[0xEF, 0xBF, 0xBF]).is_ok());
assert!(from_utf8(&[0xF0, 0x90, 0x80, 0x80]).is_ok());
assert!(from_utf8(&[0xF4, 0x8F, 0xBF, 0xBF]).is_ok());
}
#[test]
fn from_utf8_mostly_ascii() {
// deny invalid bytes embedded in long stretches of ascii
for i in 32..64 {
let mut data = [0; 128];
data[i] = 0xC0;
assert!(from_utf8(&data).is_err());
data[i] = 0xC2;
assert!(from_utf8(&data).is_err());
}
}
#[test]
fn from_utf8_error() {
macro_rules! test {
($input: expr, $expected_valid_up_to: expr, $expected_error_len: expr) => {
let error = from_utf8($input).unwrap_err();
assert_eq!(error.valid_up_to(), $expected_valid_up_to);
assert_eq!(error.error_len(), $expected_error_len);
};
}
test!(b"A\xC3\xA9 \xFF ", 4, Some(1));
test!(b"A\xC3\xA9 \x80 ", 4, Some(1));
test!(b"A\xC3\xA9 \xC1 ", 4, Some(1));
test!(b"A\xC3\xA9 \xC1", 4, Some(1));
test!(b"A\xC3\xA9 \xC2", 4, None);
test!(b"A\xC3\xA9 \xC2 ", 4, Some(1));
test!(b"A\xC3\xA9 \xC2\xC0", 4, Some(1));
test!(b"A\xC3\xA9 \xE0", 4, None);
test!(b"A\xC3\xA9 \xE0\x9F", 4, Some(1));
test!(b"A\xC3\xA9 \xE0\xA0", 4, None);
test!(b"A\xC3\xA9 \xE0\xA0\xC0", 4, Some(2));
test!(b"A\xC3\xA9 \xE0\xA0 ", 4, Some(2));
test!(b"A\xC3\xA9 \xED\xA0\x80 ", 4, Some(1));
test!(b"A\xC3\xA9 \xF1", 4, None);
test!(b"A\xC3\xA9 \xF1\x80", 4, None);
test!(b"A\xC3\xA9 \xF1\x80\x80", 4, None);
test!(b"A\xC3\xA9 \xF1 ", 4, Some(1));
test!(b"A\xC3\xA9 \xF1\x80 ", 4, Some(2));
test!(b"A\xC3\xA9 \xF1\x80\x80 ", 4, Some(3));
}
#[test]
fn test_as_bytes() {
// no null
let v = [
224, 184, 168, 224, 185, 132, 224, 184, 151, 224, 184, 162, 228, 184, 173, 229, 141, 142,
86, 105, 225, 187, 135, 116, 32, 78, 97, 109,
];
let b: &[u8] = &[];
assert_eq!("".as_bytes(), b);
assert_eq!("abc".as_bytes(), b"abc");
assert_eq!("ศไทย中华Việt Nam".as_bytes(), v);
}
#[test]
#[should_panic]
fn test_as_bytes_fail() {
// Don't double free. (I'm not sure if this exercises the
// original problem code path anymore.)
let s = String::from("");
let _bytes = s.as_bytes();
panic!();
}
#[test]
fn test_as_ptr() {
let buf = "hello".as_ptr();
unsafe {
assert_eq!(*buf.offset(0), b'h');
assert_eq!(*buf.offset(1), b'e');
assert_eq!(*buf.offset(2), b'l');
assert_eq!(*buf.offset(3), b'l');
assert_eq!(*buf.offset(4), b'o');
}
}
#[test]
fn vec_str_conversions() {
let s1: String = String::from("All mimsy were the borogoves");
let v: Vec<u8> = s1.as_bytes().to_vec();
let s2: String = String::from(from_utf8(&v).unwrap());
let mut i = 0;
let n1 = s1.len();
let n2 = v.len();
assert_eq!(n1, n2);
while i < n1 {
let a: u8 = s1.as_bytes()[i];
let b: u8 = s2.as_bytes()[i];
assert_eq!(a, b);
i += 1;
}
}
#[test]
fn test_contains() {
assert!("abcde".contains("bcd"));
assert!("abcde".contains("abcd"));
assert!("abcde".contains("bcde"));
assert!("abcde".contains(""));
assert!("".contains(""));
assert!(!"abcde".contains("def"));
assert!(!"".contains("a"));
let data = "ประเทศไทย中华Việt Nam";
assert!(data.contains("ประเ"));
assert!(data.contains("ะเ"));
assert!(data.contains("中华"));
assert!(!data.contains("ไท华"));
}
#[test]
fn test_contains_char() {
assert!("abc".contains('b'));
assert!("a".contains('a'));
assert!(!"abc".contains('d'));
assert!(!"".contains('a'));
}
#[test]
fn test_split_at() {
let s = "ศไทย中华Việt Nam";
for (index, _) in s.char_indices() {
let (a, b) = s.split_at(index);
assert_eq!(&s[..a.len()], a);
assert_eq!(&s[a.len()..], b);
}
let (a, b) = s.split_at(s.len());
assert_eq!(a, s);
assert_eq!(b, "");
}
#[test]
fn test_split_at_mut() {
let mut s = "Hello World".to_string();
{
let (a, b) = s.split_at_mut(5);
a.make_ascii_uppercase();
b.make_ascii_lowercase();
}
assert_eq!(s, "HELLO world");
}
#[test]
#[should_panic]
fn test_split_at_boundscheck() {
let s = "ศไทย中华Việt Nam";
s.split_at(1);
}
#[test]
fn test_escape_unicode() {
assert_eq!("abc".escape_unicode().to_string(), "\\u{61}\\u{62}\\u{63}");
assert_eq!("a c".escape_unicode().to_string(), "\\u{61}\\u{20}\\u{63}");
assert_eq!("\r\n\t".escape_unicode().to_string(), "\\u{d}\\u{a}\\u{9}");
assert_eq!("'\"\\".escape_unicode().to_string(), "\\u{27}\\u{22}\\u{5c}");
assert_eq!("\x00\x01\u{fe}\u{ff}".escape_unicode().to_string(), "\\u{0}\\u{1}\\u{fe}\\u{ff}");
assert_eq!("\u{100}\u{ffff}".escape_unicode().to_string(), "\\u{100}\\u{ffff}");
assert_eq!("\u{10000}\u{10ffff}".escape_unicode().to_string(), "\\u{10000}\\u{10ffff}");
assert_eq!("ab\u{fb00}".escape_unicode().to_string(), "\\u{61}\\u{62}\\u{fb00}");
assert_eq!("\u{1d4ea}\r".escape_unicode().to_string(), "\\u{1d4ea}\\u{d}");
}
#[test]
fn test_escape_debug() {
// Note that there are subtleties with the number of backslashes
// on the left- and right-hand sides. In particular, Unicode code points
// are usually escaped with two backslashes on the right-hand side, as
// they are escaped. However, when the character is unescaped (e.g., for
// printable characters), only a single backslash appears (as the character
// itself appears in the debug string).
assert_eq!("abc".escape_debug().to_string(), "abc");
assert_eq!("a c".escape_debug().to_string(), "a c");
assert_eq!("éèê".escape_debug().to_string(), "éèê");
assert_eq!("\r\n\t".escape_debug().to_string(), "\\r\\n\\t");
assert_eq!("'\"\\".escape_debug().to_string(), "\\'\\\"\\\\");
assert_eq!("\u{7f}\u{ff}".escape_debug().to_string(), "\\u{7f}\u{ff}");
assert_eq!("\u{100}\u{ffff}".escape_debug().to_string(), "\u{100}\\u{ffff}");
assert_eq!("\u{10000}\u{10ffff}".escape_debug().to_string(), "\u{10000}\\u{10ffff}");
assert_eq!("ab\u{200b}".escape_debug().to_string(), "ab\\u{200b}");
assert_eq!("\u{10d4ea}\r".escape_debug().to_string(), "\\u{10d4ea}\\r");
assert_eq!(
"\u{301}a\u{301}bé\u{e000}".escape_debug().to_string(),
"\\u{301}a\u{301}bé\\u{e000}"
);
}
#[test]
fn test_escape_default() {
assert_eq!("abc".escape_default().to_string(), "abc");
assert_eq!("a c".escape_default().to_string(), "a c");
assert_eq!("éèê".escape_default().to_string(), "\\u{e9}\\u{e8}\\u{ea}");
assert_eq!("\r\n\t".escape_default().to_string(), "\\r\\n\\t");
assert_eq!("'\"\\".escape_default().to_string(), "\\'\\\"\\\\");
assert_eq!("\u{7f}\u{ff}".escape_default().to_string(), "\\u{7f}\\u{ff}");
assert_eq!("\u{100}\u{ffff}".escape_default().to_string(), "\\u{100}\\u{ffff}");
assert_eq!("\u{10000}\u{10ffff}".escape_default().to_string(), "\\u{10000}\\u{10ffff}");
assert_eq!("ab\u{200b}".escape_default().to_string(), "ab\\u{200b}");
assert_eq!("\u{10d4ea}\r".escape_default().to_string(), "\\u{10d4ea}\\r");
}
#[test]
fn test_total_ord() {
assert_eq!("1234".cmp("123"), Greater);
assert_eq!("123".cmp("1234"), Less);
assert_eq!("1234".cmp("1234"), Equal);
assert_eq!("12345555".cmp("123456"), Less);
assert_eq!("22".cmp("1234"), Greater);
}
#[test]
fn test_iterator() {
let s = "ศไทย中华Việt Nam";
let v = ['ศ', 'ไ', 'ท', 'ย', '中', '华', 'V', 'i', 'ệ', 't', ' ', 'N', 'a', 'm'];
let mut pos = 0;
let it = s.chars();
for c in it {
assert_eq!(c, v[pos]);
pos += 1;
}
assert_eq!(pos, v.len());
assert_eq!(s.chars().count(), v.len());
}
#[test]
fn test_rev_iterator() {
let s = "ศไทย中华Việt Nam";
let v = ['m', 'a', 'N', ' ', 't', 'ệ', 'i', 'V', '华', '中', 'ย', 'ท', 'ไ', 'ศ'];
let mut pos = 0;
let it = s.chars().rev();
for c in it {
assert_eq!(c, v[pos]);
pos += 1;
}
assert_eq!(pos, v.len());
}
#[test]
#[cfg_attr(miri, ignore)] // Miri is too slow
fn test_chars_decoding() {
let mut bytes = [0; 4];
for c in (0..0x110000).filter_map(std::char::from_u32) {
let s = c.encode_utf8(&mut bytes);
if Some(c) != s.chars().next() {
panic!("character {:x}={} does not decode correctly", c as u32, c);
}
}
}
#[test]
#[cfg_attr(miri, ignore)] // Miri is too slow
fn test_chars_rev_decoding() {
let mut bytes = [0; 4];
for c in (0..0x110000).filter_map(std::char::from_u32) {
let s = c.encode_utf8(&mut bytes);
if Some(c) != s.chars().rev().next() {
panic!("character {:x}={} does not decode correctly", c as u32, c);
}
}
}
#[test]
fn test_iterator_clone() {
let s = "ศไทย中华Việt Nam";
let mut it = s.chars();
it.next();
assert!(it.clone().zip(it).all(|(x, y)| x == y));
}
#[test]
fn test_iterator_last() {
let s = "ศไทย中华Việt Nam";
let mut it = s.chars();
it.next();
assert_eq!(it.last(), Some('m'));
}
#[test]
fn test_chars_debug() {
let s = "ศไทย中华Việt Nam";
let c = s.chars();
assert_eq!(
format!("{:?}", c),
r#"Chars(['ศ', 'ไ', 'ท', 'ย', '中', '华', 'V', 'i', 'ệ', 't', ' ', 'N', 'a', 'm'])"#
);
}
#[test]
fn test_bytesator() {
let s = "ศไทย中华Việt Nam";
let v = [
224, 184, 168, 224, 185, 132, 224, 184, 151, 224, 184, 162, 228, 184, 173, 229, 141, 142,
86, 105, 225, 187, 135, 116, 32, 78, 97, 109,
];
let mut pos = 0;
for b in s.bytes() {
assert_eq!(b, v[pos]);
pos += 1;
}
}
#[test]
fn test_bytes_revator() {
let s = "ศไทย中华Việt Nam";
let v = [
224, 184, 168, 224, 185, 132, 224, 184, 151, 224, 184, 162, 228, 184, 173, 229, 141, 142,
86, 105, 225, 187, 135, 116, 32, 78, 97, 109,
];
let mut pos = v.len();
for b in s.bytes().rev() {
pos -= 1;
assert_eq!(b, v[pos]);
}
}
#[test]
fn test_bytesator_nth() {
let s = "ศไทย中华Việt Nam";
let v = [
224, 184, 168, 224, 185, 132, 224, 184, 151, 224, 184, 162, 228, 184, 173, 229, 141, 142,
86, 105, 225, 187, 135, 116, 32, 78, 97, 109,
];
let mut b = s.bytes();
assert_eq!(b.nth(2).unwrap(), v[2]);
assert_eq!(b.nth(10).unwrap(), v[10]);
assert_eq!(b.nth(200), None);
}
#[test]
fn test_bytesator_count() {
let s = "ศไทย中华Việt Nam";
let b = s.bytes();
assert_eq!(b.count(), 28)
}
#[test]
fn test_bytesator_last() {
let s = "ศไทย中华Việt Nam";
let b = s.bytes();
assert_eq!(b.last().unwrap(), 109)
}
#[test]
fn test_char_indicesator() {
let s = "ศไทย中华Việt Nam";
let p = [0, 3, 6, 9, 12, 15, 18, 19, 20, 23, 24, 25, 26, 27];
let v = ['ศ', 'ไ', 'ท', 'ย', '中', '华', 'V', 'i', 'ệ', 't', ' ', 'N', 'a', 'm'];
let mut pos = 0;
let it = s.char_indices();
for c in it {
assert_eq!(c, (p[pos], v[pos]));
pos += 1;
}
assert_eq!(pos, v.len());
assert_eq!(pos, p.len());
}
#[test]
fn test_char_indices_revator() {
let s = "ศไทย中华Việt Nam";
let p = [27, 26, 25, 24, 23, 20, 19, 18, 15, 12, 9, 6, 3, 0];
let v = ['m', 'a', 'N', ' ', 't', 'ệ', 'i', 'V', '华', '中', 'ย', 'ท', 'ไ', 'ศ'];
let mut pos = 0;
let it = s.char_indices().rev();
for c in it {
assert_eq!(c, (p[pos], v[pos]));
pos += 1;
}
assert_eq!(pos, v.len());
assert_eq!(pos, p.len());
}
#[test]
fn test_char_indices_last() {
let s = "ศไทย中华Việt Nam";
let mut it = s.char_indices();
it.next();
assert_eq!(it.last(), Some((27, 'm')));
}
#[test]
fn test_splitn_char_iterator() {
let data = "\nMäry häd ä little lämb\nLittle lämb\n";
let split: Vec<&str> = data.splitn(4, ' ').collect();
assert_eq!(split, ["\nMäry", "häd", "ä", "little lämb\nLittle lämb\n"]);
let split: Vec<&str> = data.splitn(4, |c: char| c == ' ').collect();
assert_eq!(split, ["\nMäry", "häd", "ä", "little lämb\nLittle lämb\n"]);
// Unicode
let split: Vec<&str> = data.splitn(4, 'ä').collect();
assert_eq!(split, ["\nM", "ry h", "d ", " little lämb\nLittle lämb\n"]);
let split: Vec<&str> = data.splitn(4, |c: char| c == 'ä').collect();
assert_eq!(split, ["\nM", "ry h", "d ", " little lämb\nLittle lämb\n"]);
}
#[test]
fn test_split_char_iterator_no_trailing() {
let data = "\nMäry häd ä little lämb\nLittle lämb\n";
let split: Vec<&str> = data.split('\n').collect();
assert_eq!(split, ["", "Märy häd ä little lämb", "Little lämb", ""]);
let split: Vec<&str> = data.split_terminator('\n').collect();
assert_eq!(split, ["", "Märy häd ä little lämb", "Little lämb"]);
}
#[test]
fn test_split_char_iterator_inclusive() {
let data = "\nMäry häd ä little lämb\nLittle lämb\n";
let split: Vec<&str> = data.split_inclusive('\n').collect();
assert_eq!(split, ["\n", "Märy häd ä little lämb\n", "Little lämb\n"]);
let uppercase_separated = "SheePSharKTurtlECaT";
let mut first_char = true;
let split: Vec<&str> = uppercase_separated
.split_inclusive(|c: char| {
let split = !first_char && c.is_uppercase();
first_char = split;
split
})
.collect();
assert_eq!(split, ["SheeP", "SharK", "TurtlE", "CaT"]);
}
#[test]
fn test_split_char_iterator_inclusive_rev() {
let data = "\nMäry häd ä little lämb\nLittle lämb\n";
let split: Vec<&str> = data.split_inclusive('\n').rev().collect();
assert_eq!(split, ["Little lämb\n", "Märy häd ä little lämb\n", "\n"]);
// Note that the predicate is stateful and thus dependent
// on the iteration order.
// (A different predicate is needed for reverse iterator vs normal iterator.)
// Not sure if anything can be done though.
let uppercase_separated = "SheePSharKTurtlECaT";
let mut term_char = true;
let split: Vec<&str> = uppercase_separated
.split_inclusive(|c: char| {
let split = term_char && c.is_uppercase();
term_char = c.is_uppercase();
split
})
.rev()
.collect();
assert_eq!(split, ["CaT", "TurtlE", "SharK", "SheeP"]);
}
#[test]
fn test_rsplit() {
let data = "\nMäry häd ä little lämb\nLittle lämb\n";
let split: Vec<&str> = data.rsplit(' ').collect();
assert_eq!(split, ["lämb\n", "lämb\nLittle", "little", "ä", "häd", "\nMäry"]);
let split: Vec<&str> = data.rsplit("lämb").collect();
assert_eq!(split, ["\n", "\nLittle ", "\nMäry häd ä little "]);
let split: Vec<&str> = data.rsplit(|c: char| c == 'ä').collect();
assert_eq!(split, ["mb\n", "mb\nLittle l", " little l", "d ", "ry h", "\nM"]);
}
#[test]
fn test_rsplitn() {
let data = "\nMäry häd ä little lämb\nLittle lämb\n";
let split: Vec<&str> = data.rsplitn(2, ' ').collect();
assert_eq!(split, ["lämb\n", "\nMäry häd ä little lämb\nLittle"]);
let split: Vec<&str> = data.rsplitn(2, "lämb").collect();
assert_eq!(split, ["\n", "\nMäry häd ä little lämb\nLittle "]);
let split: Vec<&str> = data.rsplitn(2, |c: char| c == 'ä').collect();
assert_eq!(split, ["mb\n", "\nMäry häd ä little lämb\nLittle l"]);
}
#[test]
fn test_split_once() {
assert_eq!("".split_once("->"), None);
assert_eq!("-".split_once("->"), None);
assert_eq!("->".split_once("->"), Some(("", "")));
assert_eq!("a->".split_once("->"), Some(("a", "")));
assert_eq!("->b".split_once("->"), Some(("", "b")));
assert_eq!("a->b".split_once("->"), Some(("a", "b")));
assert_eq!("a->b->c".split_once("->"), Some(("a", "b->c")));
assert_eq!("---".split_once("--"), Some(("", "-")));
}
#[test]
fn test_rsplit_once() {
assert_eq!("".rsplit_once("->"), None);
assert_eq!("-".rsplit_once("->"), None);
assert_eq!("->".rsplit_once("->"), Some(("", "")));
assert_eq!("a->".rsplit_once("->"), Some(("a", "")));
assert_eq!("->b".rsplit_once("->"), Some(("", "b")));
assert_eq!("a->b".rsplit_once("->"), Some(("a", "b")));
assert_eq!("a->b->c".rsplit_once("->"), Some(("a->b", "c")));
assert_eq!("---".rsplit_once("--"), Some(("-", "")));
}
#[test]
fn test_split_whitespace() {
let data = "\n \tMäry häd\tä little lämb\nLittle lämb\n";
let words: Vec<&str> = data.split_whitespace().collect();
assert_eq!(words, ["Märy", "häd", "ä", "little", "lämb", "Little", "lämb"])
}
#[test]
fn test_lines() {
let data = "\nMäry häd ä little lämb\n\r\nLittle lämb\n";
let lines: Vec<&str> = data.lines().collect();
assert_eq!(lines, ["", "Märy häd ä little lämb", "", "Little lämb"]);
let data = "\r\nMäry häd ä little lämb\n\nLittle lämb"; // no trailing \n
let lines: Vec<&str> = data.lines().collect();
assert_eq!(lines, ["", "Märy häd ä little lämb", "", "Little lämb"]);
}
#[test]
fn test_splitator() {
fn t(s: &str, sep: &str, u: &[&str]) {
let v: Vec<&str> = s.split(sep).collect();
assert_eq!(v, u);
}
t("--1233345--", "12345", &["--1233345--"]);
t("abc::hello::there", "::", &["abc", "hello", "there"]);
t("::hello::there", "::", &["", "hello", "there"]);
t("hello::there::", "::", &["hello", "there", ""]);
t("::hello::there::", "::", &["", "hello", "there", ""]);
t("ประเทศไทย中华Việt Nam", "中华", &["ประเทศไทย", "Việt Nam"]);
t("zzXXXzzYYYzz", "zz", &["", "XXX", "YYY", ""]);
t("zzXXXzYYYz", "XXX", &["zz", "zYYYz"]);
t(".XXX.YYY.", ".", &["", "XXX", "YYY", ""]);
t("", ".", &[""]);
t("zz", "zz", &["", ""]);
t("ok", "z", &["ok"]);
t("zzz", "zz", &["", "z"]);
t("zzzzz", "zz", &["", "", "z"]);
}
#[test]
fn test_str_default() {
use std::default::Default;
fn t<S: Default + AsRef<str>>() {
let s: S = Default::default();
assert_eq!(s.as_ref(), "");
}
t::<&str>();
t::<String>();
t::<&mut str>();
}
#[test]
fn test_str_container() {
fn sum_len(v: &[&str]) -> usize {
v.iter().map(|x| x.len()).sum()
}
let s = "01234";
assert_eq!(5, sum_len(&["012", "", "34"]));
assert_eq!(5, sum_len(&["01", "2", "34", ""]));
assert_eq!(5, sum_len(&[s]));
}
#[test]
fn test_str_from_utf8() {
let xs = b"hello";
assert_eq!(from_utf8(xs), Ok("hello"));
let xs = "ศไทย中华Việt Nam".as_bytes();
assert_eq!(from_utf8(xs), Ok("ศไทย中华Việt Nam"));
let xs = b"hello\xFF";
assert!(from_utf8(xs).is_err());
}
#[test]
fn test_pattern_deref_forward() {
let data = "aabcdaa";
assert!(data.contains("bcd"));
assert!(data.contains(&"bcd"));
assert!(data.contains(&"bcd".to_string()));
}
#[test]
fn test_empty_match_indices() {
let data = "aä中!";
let vec: Vec<_> = data.match_indices("").collect();
assert_eq!(vec, [(0, ""), (1, ""), (3, ""), (6, ""), (7, "")]);
}
#[test]
fn test_bool_from_str() {
assert_eq!("true".parse().ok(), Some(true));
assert_eq!("false".parse().ok(), Some(false));
assert_eq!("not even a boolean".parse::<bool>().ok(), None);
}
fn check_contains_all_substrings(s: &str) {
assert!(s.contains(""));
for i in 0..s.len() {
for j in i + 1..=s.len() {
assert!(s.contains(&s[i..j]));
}
}
}
#[test]
#[cfg_attr(miri, ignore)] // Miri is too slow
fn strslice_issue_16589() {
assert!("bananas".contains("nana"));
// prior to the fix for #16589, x.contains("abcdabcd") returned false
// test all substrings for good measure
check_contains_all_substrings("012345678901234567890123456789bcdabcdabcd");
}
#[test]
fn strslice_issue_16878() {
assert!(!"1234567ah012345678901ah".contains("hah"));
assert!(!"00abc01234567890123456789abc".contains("bcabc"));
}
#[test]
#[cfg_attr(miri, ignore)] // Miri is too slow
fn test_strslice_contains() {
let x = "There are moments, Jeeves, when one asks oneself, 'Do trousers matter?'";
check_contains_all_substrings(x);
}
#[test]
fn test_rsplitn_char_iterator() {
let data = "\nMäry häd ä little lämb\nLittle lämb\n";
let mut split: Vec<&str> = data.rsplitn(4, ' ').collect();
split.reverse();
assert_eq!(split, ["\nMäry häd ä", "little", "lämb\nLittle", "lämb\n"]);
let mut split: Vec<&str> = data.rsplitn(4, |c: char| c == ' ').collect();
split.reverse();
assert_eq!(split, ["\nMäry häd ä", "little", "lämb\nLittle", "lämb\n"]);
// Unicode
let mut split: Vec<&str> = data.rsplitn(4, 'ä').collect();
split.reverse();
assert_eq!(split, ["\nMäry häd ", " little l", "mb\nLittle l", "mb\n"]);
let mut split: Vec<&str> = data.rsplitn(4, |c: char| c == 'ä').collect();
split.reverse();
assert_eq!(split, ["\nMäry häd ", " little l", "mb\nLittle l", "mb\n"]);
}
#[test]
fn test_split_char_iterator() {
let data = "\nMäry häd ä little lämb\nLittle lämb\n";
let split: Vec<&str> = data.split(' ').collect();
assert_eq!(split, ["\nMäry", "häd", "ä", "little", "lämb\nLittle", "lämb\n"]);
let mut rsplit: Vec<&str> = data.split(' ').rev().collect();
rsplit.reverse();
assert_eq!(rsplit, ["\nMäry", "häd", "ä", "little", "lämb\nLittle", "lämb\n"]);
let split: Vec<&str> = data.split(|c: char| c == ' ').collect();
assert_eq!(split, ["\nMäry", "häd", "ä", "little", "lämb\nLittle", "lämb\n"]);
let mut rsplit: Vec<&str> = data.split(|c: char| c == ' ').rev().collect();
rsplit.reverse();
assert_eq!(rsplit, ["\nMäry", "häd", "ä", "little", "lämb\nLittle", "lämb\n"]);
// Unicode
let split: Vec<&str> = data.split('ä').collect();
assert_eq!(split, ["\nM", "ry h", "d ", " little l", "mb\nLittle l", "mb\n"]);
let mut rsplit: Vec<&str> = data.split('ä').rev().collect();
rsplit.reverse();
assert_eq!(rsplit, ["\nM", "ry h", "d ", " little l", "mb\nLittle l", "mb\n"]);
let split: Vec<&str> = data.split(|c: char| c == 'ä').collect();
assert_eq!(split, ["\nM", "ry h", "d ", " little l", "mb\nLittle l", "mb\n"]);
let mut rsplit: Vec<&str> = data.split(|c: char| c == 'ä').rev().collect();
rsplit.reverse();
assert_eq!(rsplit, ["\nM", "ry h", "d ", " little l", "mb\nLittle l", "mb\n"]);
}
#[test]
fn test_rev_split_char_iterator_no_trailing() {
let data = "\nMäry häd ä little lämb\nLittle lämb\n";
let mut split: Vec<&str> = data.split('\n').rev().collect();
split.reverse();
assert_eq!(split, ["", "Märy häd ä little lämb", "Little lämb", ""]);
let mut split: Vec<&str> = data.split_terminator('\n').rev().collect();
split.reverse();
assert_eq!(split, ["", "Märy häd ä little lämb", "Little lämb"]);
}
#[test]
fn test_utf16_code_units() {
assert_eq!("é\u{1F4A9}".encode_utf16().collect::<Vec<u16>>(), [0xE9, 0xD83D, 0xDCA9])
}
#[test]
fn starts_with_in_unicode() {
assert!(!"├── Cargo.toml".starts_with("# "));
}
#[test]
fn starts_short_long() {
assert!(!"".starts_with("##"));
assert!(!"##".starts_with("####"));
assert!("####".starts_with("##"));
assert!(!"##ä".starts_with("####"));
assert!("####ä".starts_with("##"));
assert!(!"##".starts_with("####ä"));
assert!("##ä##".starts_with("##ä"));
assert!("".starts_with(""));
assert!("ä".starts_with(""));
assert!("#ä".starts_with(""));
assert!("##ä".starts_with(""));
assert!("ä###".starts_with(""));
assert!("#ä##".starts_with(""));
assert!("##ä#".starts_with(""));
}
#[test]
fn contains_weird_cases() {
assert!("* \t".contains(' '));
assert!(!"* \t".contains('?'));
assert!(!"* \t".contains('\u{1F4A9}'));
}
#[test]
fn trim_ws() {
assert_eq!(" \t a \t ".trim_start_matches(|c: char| c.is_whitespace()), "a \t ");
assert_eq!(" \t a \t ".trim_end_matches(|c: char| c.is_whitespace()), " \t a");
assert_eq!(" \t a \t ".trim_start_matches(|c: char| c.is_whitespace()), "a \t ");
assert_eq!(" \t a \t ".trim_end_matches(|c: char| c.is_whitespace()), " \t a");
assert_eq!(" \t a \t ".trim_matches(|c: char| c.is_whitespace()), "a");
assert_eq!(" \t \t ".trim_start_matches(|c: char| c.is_whitespace()), "");
assert_eq!(" \t \t ".trim_end_matches(|c: char| c.is_whitespace()), "");
assert_eq!(" \t \t ".trim_start_matches(|c: char| c.is_whitespace()), "");
assert_eq!(" \t \t ".trim_end_matches(|c: char| c.is_whitespace()), "");
assert_eq!(" \t \t ".trim_matches(|c: char| c.is_whitespace()), "");
}
#[test]
fn to_lowercase() {
assert_eq!("".to_lowercase(), "");
assert_eq!("AÉDžaé ".to_lowercase(), "aédžaé ");
// https://github.com/rust-lang/rust/issues/26035
assert_eq!("ΑΣ".to_lowercase(), "ας");
assert_eq!("Α'Σ".to_lowercase(), "α'ς");
assert_eq!("Α''Σ".to_lowercase(), "α''ς");
assert_eq!("ΑΣ Α".to_lowercase(), "ας α");
assert_eq!("Α'Σ Α".to_lowercase(), "α'ς α");
assert_eq!("Α''Σ Α".to_lowercase(), "α''ς α");
assert_eq!("ΑΣ' Α".to_lowercase(), "ας' α");
assert_eq!("ΑΣ'' Α".to_lowercase(), "ας'' α");
assert_eq!("Α'Σ' Α".to_lowercase(), "α'ς' α");
assert_eq!("Α''Σ'' Α".to_lowercase(), "α''ς'' α");
assert_eq!("Α Σ".to_lowercase(), "α σ");
assert_eq!("Α 'Σ".to_lowercase(), "α 'σ");
assert_eq!("Α ''Σ".to_lowercase(), "α ''σ");
assert_eq!("Σ".to_lowercase(), "σ");
assert_eq!("'Σ".to_lowercase(), "'σ");
assert_eq!("''Σ".to_lowercase(), "''σ");
assert_eq!("ΑΣΑ".to_lowercase(), "ασα");
assert_eq!("ΑΣ'Α".to_lowercase(), "ασ'α");
assert_eq!("ΑΣ''Α".to_lowercase(), "ασ''α");
}
#[test]
fn to_uppercase() {
assert_eq!("".to_uppercase(), "");
assert_eq!("aéDžßfiᾀ".to_uppercase(), "AÉDŽSSFIἈΙ");
}
#[test]
fn test_into_string() {
// The only way to acquire a Box<str> in the first place is through a String, so just
// test that we can round-trip between Box<str> and String.
let string = String::from("Some text goes here");
assert_eq!(string.clone().into_boxed_str().into_string(), string);
}
#[test]
fn test_box_slice_clone() {
let data = String::from("hello HELLO hello HELLO yes YES 5 中ä华!!!");
let data2 = data.clone().into_boxed_str().clone().into_string();
assert_eq!(data, data2);
}
#[test]
fn test_cow_from() {
let borrowed = "borrowed";
let owned = String::from("owned");
match (Cow::from(owned.clone()), Cow::from(borrowed)) {
(Cow::Owned(o), Cow::Borrowed(b)) => assert!(o == owned && b == borrowed),
_ => panic!("invalid `Cow::from`"),
}
}
#[test]
fn test_repeat() {
assert_eq!("".repeat(3), "");
assert_eq!("abc".repeat(0), "");
assert_eq!("α".repeat(3), "ααα");
}
mod pattern {
use std::str::pattern::SearchStep::{self, Done, Match, Reject};
use std::str::pattern::{Pattern, ReverseSearcher, Searcher};
macro_rules! make_test {
($name:ident, $p:expr, $h:expr, [$($e:expr,)*]) => {
#[allow(unused_imports)]
mod $name {
use std::str::pattern::SearchStep::{Match, Reject};
use super::{cmp_search_to_vec};
#[test]
fn fwd() {
cmp_search_to_vec(false, $p, $h, vec![$($e),*]);
}
#[test]
fn bwd() {
cmp_search_to_vec(true, $p, $h, vec![$($e),*]);
}
}
}
}
fn cmp_search_to_vec<'a>(
rev: bool,
pat: impl Pattern<'a, Searcher: ReverseSearcher<'a>>,
haystack: &'a str,
right: Vec<SearchStep>,
) {
let mut searcher = pat.into_searcher(haystack);
let mut v = vec![];
loop {
match if !rev { searcher.next() } else { searcher.next_back() } {
Match(a, b) => v.push(Match(a, b)),
Reject(a, b) => v.push(Reject(a, b)),
Done => break,
}
}
if rev {
v.reverse();
}
let mut first_index = 0;
let mut err = None;
for (i, e) in right.iter().enumerate() {
match *e {
Match(a, b) | Reject(a, b) if a <= b && a == first_index => {
first_index = b;
}
_ => {
err = Some(i);
break;
}
}
}
if let Some(err) = err {
panic!("Input skipped range at {}", err);
}
if first_index != haystack.len() {
panic!("Did not cover whole input");
}
assert_eq!(v, right);
}
make_test!(
str_searcher_ascii_haystack,
"bb",
"abbcbbd",
[Reject(0, 1), Match(1, 3), Reject(3, 4), Match(4, 6), Reject(6, 7),]
);
make_test!(
str_searcher_ascii_haystack_seq,
"bb",
"abbcbbbbd",
[Reject(0, 1), Match(1, 3), Reject(3, 4), Match(4, 6), Match(6, 8), Reject(8, 9),]
);
make_test!(
str_searcher_empty_needle_ascii_haystack,
"",
"abbcbbd",
[
Match(0, 0),
Reject(0, 1),
Match(1, 1),
Reject(1, 2),
Match(2, 2),
Reject(2, 3),
Match(3, 3),
Reject(3, 4),
Match(4, 4),
Reject(4, 5),
Match(5, 5),
Reject(5, 6),
Match(6, 6),
Reject(6, 7),
Match(7, 7),
]
);
make_test!(
str_searcher_multibyte_haystack,
" ",
"├──",
[Reject(0, 3), Reject(3, 6), Reject(6, 9),]
);
make_test!(
str_searcher_empty_needle_multibyte_haystack,
"",
"├──",
[
Match(0, 0),
Reject(0, 3),
Match(3, 3),
Reject(3, 6),
Match(6, 6),
Reject(6, 9),
Match(9, 9),
]
);
make_test!(str_searcher_empty_needle_empty_haystack, "", "", [Match(0, 0),]);
make_test!(str_searcher_nonempty_needle_empty_haystack, "├", "", []);
make_test!(
char_searcher_ascii_haystack,
'b',
"abbcbbd",
[
Reject(0, 1),
Match(1, 2),
Match(2, 3),
Reject(3, 4),
Match(4, 5),
Match(5, 6),
Reject(6, 7),
]
);
make_test!(
char_searcher_multibyte_haystack,
' ',
"├──",
[Reject(0, 3), Reject(3, 6), Reject(6, 9),]
);
make_test!(
char_searcher_short_haystack,
'\u{1F4A9}',
"* \t",
[Reject(0, 1), Reject(1, 2), Reject(2, 3),]
);
}
macro_rules! generate_iterator_test {
{
$name:ident {
$(
($($arg:expr),*) -> [$($t:tt)*];
)*
}
with $fwd:expr, $bwd:expr;
} => {
#[test]
fn $name() {
$(
{
let res = vec![$($t)*];
let fwd_vec: Vec<_> = ($fwd)($($arg),*).collect();
assert_eq!(fwd_vec, res);
let mut bwd_vec: Vec<_> = ($bwd)($($arg),*).collect();
bwd_vec.reverse();
assert_eq!(bwd_vec, res);
}
)*
}
};
{
$name:ident {
$(
($($arg:expr),*) -> [$($t:tt)*];
)*
}
with $fwd:expr;
} => {
#[test]
fn $name() {
$(
{
let res = vec![$($t)*];
let fwd_vec: Vec<_> = ($fwd)($($arg),*).collect();
assert_eq!(fwd_vec, res);
}
)*
}
}
}
generate_iterator_test! {
double_ended_split {
("foo.bar.baz", '.') -> ["foo", "bar", "baz"];
("foo::bar::baz", "::") -> ["foo", "bar", "baz"];
}
with str::split, str::rsplit;
}
generate_iterator_test! {
double_ended_split_terminator {
("foo;bar;baz;", ';') -> ["foo", "bar", "baz"];
}
with str::split_terminator, str::rsplit_terminator;
}
generate_iterator_test! {
double_ended_matches {
("a1b2c3", char::is_numeric) -> ["1", "2", "3"];
}
with str::matches, str::rmatches;
}
generate_iterator_test! {
double_ended_match_indices {
("a1b2c3", char::is_numeric) -> [(1, "1"), (3, "2"), (5, "3")];
}
with str::match_indices, str::rmatch_indices;
}
generate_iterator_test! {
not_double_ended_splitn {
("foo::bar::baz", 2, "::") -> ["foo", "bar::baz"];
}
with str::splitn;
}
generate_iterator_test! {
not_double_ended_rsplitn {
("foo::bar::baz", 2, "::") -> ["baz", "foo::bar"];
}
with str::rsplitn;
}
#[test]
fn different_str_pattern_forwarding_lifetimes() {
use std::str::pattern::Pattern;
fn foo<'a, P>(p: P)
where
for<'b> &'b P: Pattern<'a>,
{
for _ in 0..3 {
"asdf".find(&p);
}
}
foo::<&str>("x");
}
#[test]
fn test_str_multiline() {
let a: String = "this \
is a test"
.to_string();
let b: String = "this \
is \
another \
test"
.to_string();
assert_eq!(a, "this is a test".to_string());
assert_eq!(b, "this is another test".to_string());
}
#[test]
fn test_str_escapes() {
let x = "\\\\\
";
assert_eq!(x, r"\\"); // extraneous whitespace stripped
}