use std::assert_matches::assert_matches; use std::borrow::Cow; use std::cmp::Ordering::{Equal, Greater, Less}; use std::str::{from_utf8, from_utf8_unchecked}; #[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] fn test_join_issue_80335() { use core::{borrow::Borrow, cell::Cell}; struct WeirdBorrow { state: Cell, } impl Default for WeirdBorrow { fn default() -> Self { WeirdBorrow { state: Cell::new(false) } } } impl Borrow for WeirdBorrow { fn borrow(&self) -> &str { let state = self.state.get(); if state { "0" } else { self.state.set(true); "123456" } } } let arr: [WeirdBorrow; 3] = Default::default(); test_join!("0-0-0", arr, "-"); } #[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() { let _ = &"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 rangeinclusive_len { data: "abcdef"; good: data[0..=5] == "abcdef"; bad: data[0..=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 rangeinclusive_exhausted { data: "abcdef"; good: data[0..=5] == "abcdef"; good: data[{ let mut iter = 0..=5; iter.by_ref().count(); // exhaust it iter }] == ""; // 0..=6 is out of bounds before exhaustion, so it // stands to reason that it still would be after. bad: data[{ let mut iter = 0..=6; iter.by_ref().count(); // exhaust it iter }]; 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() { let _ = &LOREM_PARAGRAPH[..1024]; } // check the truncation in the panic message #[test] #[should_panic(expected = "luctus, im`[...]")] fn test_slice_fail_truncated_2() { let _ = &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"; let _ = &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; let _ = &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 test_const_is_utf8() { const _: () = { // 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 const_from_utf8_mostly_ascii() { const _: () = { // deny invalid bytes embedded in long stretches of ascii let mut i = 32; while i < 64 { let mut data = [0; 128]; data[i] = 0xC0; assert!(from_utf8(&data).is_err()); data[i] = 0xC2; assert!(from_utf8(&data).is_err()); i = i + 1; } }; } #[test] fn from_utf8_error() { macro_rules! test { ($input: expr, $expected_valid_up_to:pat, $expected_error_len:pat) => { let error = from_utf8($input).unwrap_err(); assert_matches!(error.valid_up_to(), $expected_valid_up_to); assert_matches!(error.error_len(), $expected_error_len); const _: () = { match from_utf8($input) { Err(error) => { let valid_up_to = error.valid_up_to(); let error_len = error.error_len(); assert!(matches!(valid_up_to, $expected_valid_up_to)); assert!(matches!(error_len, $expected_error_len)); } Ok(_) => unreachable!(), } }; }; } 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 = 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"; let _ = 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!("\0\r\n\t".escape_debug().to_string(), "\\0\\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] fn test_to_lowercase_rev_iterator() { let s = "AÖßÜ💩ΣΤΙΓΜΑΣDžfiİ"; let v = ['\u{307}', 'i', 'fi', 'dž', 'σ', 'α', 'μ', 'γ', 'ι', 'τ', 'σ', '💩', 'ü', 'ß', 'ö', 'a']; let mut pos = 0; let it = s.chars().flat_map(|c| c.to_lowercase()).rev(); for c in it { assert_eq!(c, v[pos]); pos += 1; } assert_eq!(pos, v.len()); } #[test] fn test_to_uppercase_rev_iterator() { let s = "aößü💩στιγμαςDžfiᾀ"; let v = ['Ι', 'Ἀ', 'I', 'F', 'DŽ', 'Σ', 'Α', 'Μ', 'Γ', 'Ι', 'Τ', 'Σ', '💩', 'Ü', 'S', 'S', 'Ö', 'A']; let mut pos = 0; let it = s.chars().flat_map(|c| c.to_uppercase()).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>() { let s: S = Default::default(); assert_eq!(s.as_ref(), ""); } t::<&str>(); t::(); 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::().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::>(), [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 in the first place is through a String, so just // test that we can round-trip between Box 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, ) { 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),] ); // See #85462 #[test] fn str_searcher_empty_needle_after_done() { // Empty needle and haystack { let mut searcher = "".into_searcher(""); assert_eq!(searcher.next(), SearchStep::Match(0, 0)); assert_eq!(searcher.next(), SearchStep::Done); assert_eq!(searcher.next(), SearchStep::Done); assert_eq!(searcher.next(), SearchStep::Done); let mut searcher = "".into_searcher(""); assert_eq!(searcher.next_back(), SearchStep::Match(0, 0)); assert_eq!(searcher.next_back(), SearchStep::Done); assert_eq!(searcher.next_back(), SearchStep::Done); assert_eq!(searcher.next_back(), SearchStep::Done); } // Empty needle and non-empty haystack { let mut searcher = "".into_searcher("a"); assert_eq!(searcher.next(), SearchStep::Match(0, 0)); assert_eq!(searcher.next(), SearchStep::Reject(0, 1)); assert_eq!(searcher.next(), SearchStep::Match(1, 1)); assert_eq!(searcher.next(), SearchStep::Done); assert_eq!(searcher.next(), SearchStep::Done); assert_eq!(searcher.next(), SearchStep::Done); let mut searcher = "".into_searcher("a"); assert_eq!(searcher.next_back(), SearchStep::Match(1, 1)); assert_eq!(searcher.next_back(), SearchStep::Reject(0, 1)); assert_eq!(searcher.next_back(), SearchStep::Match(0, 0)); assert_eq!(searcher.next_back(), SearchStep::Done); assert_eq!(searcher.next_back(), SearchStep::Done); assert_eq!(searcher.next_back(), SearchStep::Done); } } } 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 } #[test] fn const_str_ptr() { const A: [u8; 2] = ['h' as u8, 'i' as u8]; const B: &'static [u8; 2] = &A; const C: *const u8 = B as *const u8; // Miri does not deduplicate consts (https://github.com/rust-lang/miri/issues/131) #[cfg(not(miri))] { let foo = &A as *const u8; assert_eq!(foo, C); } unsafe { assert_eq!(from_utf8_unchecked(&A), "hi"); assert_eq!(*C, A[0]); assert_eq!(*(&B[0] as *const u8), A[0]); } } #[test] fn utf8() { let yen: char = '¥'; // 0xa5 let c_cedilla: char = 'ç'; // 0xe7 let thorn: char = 'þ'; // 0xfe let y_diaeresis: char = 'ÿ'; // 0xff let pi: char = 'Π'; // 0x3a0 assert_eq!(yen as isize, 0xa5); assert_eq!(c_cedilla as isize, 0xe7); assert_eq!(thorn as isize, 0xfe); assert_eq!(y_diaeresis as isize, 0xff); assert_eq!(pi as isize, 0x3a0); assert_eq!(pi as isize, '\u{3a0}' as isize); assert_eq!('\x0a' as isize, '\n' as isize); let bhutan: String = "འབྲུག་ཡུལ།".to_string(); let japan: String = "日本".to_string(); let uzbekistan: String = "Ўзбекистон".to_string(); let austria: String = "Österreich".to_string(); let bhutan_e: String = "\u{f60}\u{f56}\u{fb2}\u{f74}\u{f42}\u{f0b}\u{f61}\u{f74}\u{f63}\u{f0d}".to_string(); let japan_e: String = "\u{65e5}\u{672c}".to_string(); let uzbekistan_e: String = "\u{40e}\u{437}\u{431}\u{435}\u{43a}\u{438}\u{441}\u{442}\u{43e}\u{43d}".to_string(); let austria_e: String = "\u{d6}sterreich".to_string(); let oo: char = 'Ö'; assert_eq!(oo as isize, 0xd6); fn check_str_eq(a: String, b: String) { let mut i: isize = 0; for ab in a.bytes() { println!("{i}"); println!("{ab}"); let bb: u8 = b.as_bytes()[i as usize]; println!("{bb}"); assert_eq!(ab, bb); i += 1; } } check_str_eq(bhutan, bhutan_e); check_str_eq(japan, japan_e); check_str_eq(uzbekistan, uzbekistan_e); check_str_eq(austria, austria_e); } #[test] fn utf8_chars() { // Chars of 1, 2, 3, and 4 bytes let chs: Vec = vec!['e', 'é', '€', '\u{10000}']; let s: String = chs.iter().cloned().collect(); let schs: Vec = s.chars().collect(); assert_eq!(s.len(), 10); assert_eq!(s.chars().count(), 4); assert_eq!(schs.len(), 4); assert_eq!(schs.iter().cloned().collect::(), s); assert!((from_utf8(s.as_bytes()).is_ok())); // invalid prefix assert!((!from_utf8(&[0x80]).is_ok())); // invalid 2 byte prefix assert!((!from_utf8(&[0xc0]).is_ok())); assert!((!from_utf8(&[0xc0, 0x10]).is_ok())); // invalid 3 byte prefix assert!((!from_utf8(&[0xe0]).is_ok())); assert!((!from_utf8(&[0xe0, 0x10]).is_ok())); assert!((!from_utf8(&[0xe0, 0xff, 0x10]).is_ok())); // invalid 4 byte prefix assert!((!from_utf8(&[0xf0]).is_ok())); assert!((!from_utf8(&[0xf0, 0x10]).is_ok())); assert!((!from_utf8(&[0xf0, 0xff, 0x10]).is_ok())); assert!((!from_utf8(&[0xf0, 0xff, 0xff, 0x10]).is_ok())); } #[test] fn utf8_char_counts() { let strs = [("e", 1), ("é", 1), ("€", 1), ("\u{10000}", 1), ("eé€\u{10000}", 4)]; let spread = if cfg!(miri) { 4 } else { 8 }; let mut reps = [8, 64, 256, 512] .iter() .copied() .flat_map(|n| n - spread..=n + spread) .collect::>(); if cfg!(not(miri)) { reps.extend([1024, 1 << 16].iter().copied().flat_map(|n| n - spread..=n + spread)); } let counts = if cfg!(miri) { 0..1 } else { 0..8 }; let padding = counts.map(|len| " ".repeat(len)).collect::>(); for repeat in reps { for (tmpl_str, tmpl_char_count) in strs { for pad_start in &padding { for pad_end in &padding { // Create a string with padding... let with_padding = format!("{}{}{}", pad_start, tmpl_str.repeat(repeat), pad_end); // ...and then skip past that padding. This should ensure // that we test several different alignments for both head // and tail. let si = pad_start.len(); let ei = with_padding.len() - pad_end.len(); let target = &with_padding[si..ei]; assert!(!target.starts_with(" ") && !target.ends_with(" ")); let expected_count = tmpl_char_count * repeat; assert_eq!( expected_count, target.chars().count(), "wrong count for `{:?}.repeat({})` (padding: `{:?}`)", tmpl_str, repeat, (pad_start.len(), pad_end.len()), ); } } } } } #[test] fn floor_char_boundary() { fn check_many(s: &str, arg: impl IntoIterator, ret: usize) { for idx in arg { assert_eq!( s.floor_char_boundary(idx), ret, "{:?}.floor_char_boundary({:?}) != {:?}", s, idx, ret ); } } // edge case check_many("", [0, 1, isize::MAX as usize, usize::MAX], 0); // basic check check_many("x", [0], 0); check_many("x", [1, isize::MAX as usize, usize::MAX], 1); // 1-byte chars check_many("jp", [0], 0); check_many("jp", [1], 1); check_many("jp", 2..4, 2); // 2-byte chars check_many("ĵƥ", 0..2, 0); check_many("ĵƥ", 2..4, 2); check_many("ĵƥ", 4..6, 4); // 3-byte chars check_many("日本", 0..3, 0); check_many("日本", 3..6, 3); check_many("日本", 6..8, 6); // 4-byte chars check_many("🇯🇵", 0..4, 0); check_many("🇯🇵", 4..8, 4); check_many("🇯🇵", 8..10, 8); } #[test] fn ceil_char_boundary() { fn check_many(s: &str, arg: impl IntoIterator, ret: usize) { for idx in arg { assert_eq!( s.ceil_char_boundary(idx), ret, "{:?}.ceil_char_boundary({:?}) != {:?}", s, idx, ret ); } } // edge case check_many("", [0], 0); // basic check check_many("x", [0], 0); check_many("x", [1], 1); // 1-byte chars check_many("jp", [0], 0); check_many("jp", [1], 1); check_many("jp", [2], 2); // 2-byte chars check_many("ĵƥ", 0..=0, 0); check_many("ĵƥ", 1..=2, 2); check_many("ĵƥ", 3..=4, 4); // 3-byte chars check_many("日本", 0..=0, 0); check_many("日本", 1..=3, 3); check_many("日本", 4..=6, 6); // 4-byte chars check_many("🇯🇵", 0..=0, 0); check_many("🇯🇵", 1..=4, 4); check_many("🇯🇵", 5..=8, 8); } #[test] #[should_panic] fn ceil_char_boundary_above_len_panic() { let _ = "x".ceil_char_boundary(2); }