import strings // Copyright (c) 2019-2022 Alexander Medvednikov. All rights reserved. // Use of this source code is governed by an MIT license // that can be found in the LICENSE file. struct Foo { bar int mut: str string } fn test_add() { mut a := 'a' a += 'b' assert a == ('ab') a = 'a' for i := 1; i < 1000; i++ { a += 'b' } assert a.len == 1000 assert a.ends_with('bbbbb') a += '123' assert a.ends_with('3') } fn test_len_utf8() { assert 'Vlang'.len_utf8() == 5 assert 'María'.len_utf8() == 5 assert '姓名'.len_utf8() == 2 assert 'Слово'.len_utf8() == 5 assert 'Λέξη'.len_utf8() == 4 } fn test_ends_with() { a := 'browser.v' assert a.ends_with('.v') s := 'V Programming Language' assert s.ends_with('guage') == true assert s.ends_with('Language') == true assert s.ends_with('Programming Language') == true assert s.ends_with('V') == false } fn test_between() { s := 'hello [man] how you doing' assert s.find_between('[', ']') == 'man' } fn test_compare() { a := 'Music' b := 'src' assert b >= a } fn test_lt() { a := '' b := 'a' c := 'a' d := 'b' e := 'aa' f := 'ab' assert a < b assert !(b < c) assert c < d assert !(d < e) assert c < e assert e < f } fn test_ge() { a := 'aa' b := 'aa' c := 'ab' d := 'abc' e := 'aaa' assert b >= a assert c >= b assert d >= c assert !(c >= d) assert e >= a } fn test_compare_strings() { a := 'aa' b := 'aa' c := 'ab' d := 'abc' e := 'aaa' assert compare_strings(a, b) == 0 assert compare_strings(b, c) == -1 assert compare_strings(c, d) == -1 assert compare_strings(d, e) == 1 assert compare_strings(a, e) == -1 assert compare_strings(e, a) == 1 } fn test_sort() { mut vals := [ 'arr', 'an', 'a', 'any', ] len := vals.len vals.sort() assert len == vals.len assert vals[0] == 'a' assert vals[1] == 'an' assert vals[2] == 'any' assert vals[3] == 'arr' } fn test_sort_reverse() { mut vals := [ 'arr', 'an', 'a', 'any', ] len := vals.len vals.sort(b > a) assert len == vals.len assert vals[0] == 'a' assert vals[1] == 'an' assert vals[2] == 'any' assert vals[3] == 'arr' } fn test_ranges() { s := 'test' s1 := s[0..20] or { 'both' } s2 := s[..20] or { 'last' } s3 := s[10..] or { 'first' } s4 := ranges_propagate_both(s) or { 'both' } s5 := ranges_propagate_last(s) or { 'last' } s6 := ranges_propagate_first(s) or { 'first' } assert s1 == 'both' assert s2 == 'last' assert s3 == 'first' assert s4 == 'both' assert s5 == 'last' assert s6 == 'first' } fn ranges_propagate_first(s string) !string { return s[10..]! } fn ranges_propagate_last(s string) !string { return s[..20]! } fn ranges_propagate_both(s string) !string { return s[1..20]! } fn test_split_nth() { a := '1,2,3' assert a.split(',').len == 3 assert a.split_nth(',', -1).len == 3 assert a.split_nth(',', 0).len == 3 assert a.split_nth(',', 1).len == 1 assert a.split_nth(',', 2).len == 2 assert a.split_nth(',', 10).len == 3 b := '1::2::3' assert b.split('::').len == 3 assert b.split_nth('::', -1).len == 3 assert b.split_nth('::', 0).len == 3 assert b.split_nth('::', 1).len == 1 assert b.split_nth('::', 2).len == 2 assert b.split_nth('::', 10).len == 3 c := 'ABCDEF' println(c.split('').len) assert c.split('').len == 6 assert c.split_nth('', 3).len == 3 assert c.split_nth('BC', -1).len == 2 d := ',' assert d.split(',').len == 2 assert d.split_nth('', 3).len == 1 assert d.split_nth(',', -1).len == 2 assert d.split_nth(',', 3).len == 2 e := ',,,0,,,,,a,,b,' assert e.split(',,').len == 5 assert e.split_nth(',,', 3).len == 3 assert e.split_nth(',', -1).len == 12 assert e.split_nth(',', 3).len == 3 } fn test_split_nth_values() { line := 'CMD=eprintln(phase=1)' a0 := line.split_nth('=', 0) assert a0.len == 3 assert a0[0] == 'CMD' assert a0[1] == 'eprintln(phase' assert a0[2] == '1)' a1 := line.split_nth('=', 1) assert a1.len == 1 assert a1[0] == 'CMD=eprintln(phase=1)' a2 := line.split_nth('=', 2) assert a2.len == 2 assert a2[0] == 'CMD' assert a2[1] == 'eprintln(phase=1)' a3 := line.split_nth('=', 3) assert a3.len == 3 assert a3[0] == 'CMD' assert a3[1] == 'eprintln(phase' assert a3[2] == '1)' a4 := line.split_nth('=', 4) assert a4.len == 3 assert a4[0] == 'CMD' assert a4[1] == 'eprintln(phase' assert a4[2] == '1)' } fn test_split() { mut s := 'volt/twitch.v:34' mut vals := s.split(':') assert vals.len == 2 assert vals[0] == 'volt/twitch.v' assert vals[1] == '34' // ///////// s = '2018-01-01z13:01:02' vals = s.split('z') assert vals.len == 2 assert vals[0] == '2018-01-01' assert vals[1] == '13:01:02' // ////////// s = '4627a862c3dec29fb3182a06b8965e0025759e18___1530207969___blue' vals = s.split('___') assert vals.len == 3 assert vals[0] == '4627a862c3dec29fb3182a06b8965e0025759e18' assert vals[1] == '1530207969' assert vals[2] == 'blue' // ///////// s = 'lalala' vals = s.split('a') assert vals.len == 4 assert vals[0] == 'l' assert vals[1] == 'l' assert vals[2] == 'l' assert vals[3] == '' // ///////// s = 'awesome' a := s.split('') assert a.len == 7 assert a[0] == 'a' assert a[1] == 'w' assert a[2] == 'e' assert a[3] == 's' assert a[4] == 'o' assert a[5] == 'm' assert a[6] == 'e' // ///////// s = 'wavy turquoise bags' vals = s.split(' bags') assert vals.len == 2 assert vals[0] == 'wavy turquoise' assert vals[1] == '' } fn test_split_any() { assert 'ABC'.split_any('') == ['A', 'B', 'C'] assert ''.split_any(' ') == [] assert ' '.split_any(' ') == [''] assert ' '.split_any(' ') == ['', ''] assert 'Ciao come stai? '.split_any(' ') == ['Ciao', 'come', 'stai?'] assert 'Ciao+come*stai? '.split_any('+*') == ['Ciao', 'come', 'stai? '] assert 'Ciao+come*stai? '.split_any('+* ') == ['Ciao', 'come', 'stai?'] assert 'first row\nsecond row'.split_any(' \n') == ['first', 'row', 'second', 'row'] } fn test_trim_space() { a := ' a ' assert a.trim_space() == 'a' code := ' fn main() { println(2) } ' code_clean := 'fn main() { println(2) }' assert code.trim_space() == code_clean } fn test_join() { mut strings := ['a', 'b', 'c'] mut s := strings.join(' ') assert s == 'a b c' strings = [ 'one two ', 'three! four!', ] s = strings.join(' ') assert s.contains('one') && s.contains('two ') && s.contains('four') empty := []string{len: 0} assert empty.join('A') == '' } fn test_clone() { mut a := 'a' a += 'a' a += 'a' b := a c := a.clone() assert c == a assert c == 'aaa' assert b == 'aaa' } fn test_replace() { a := 'hello man!' mut b := a.replace('man', 'world') assert b == ('hello world!') b = b.replace('!', '') assert b == ('hello world') b = b.replace('h', 'H') assert b == ('Hello world') b = b.replace('foo', 'bar') assert b == ('Hello world') s := 'hey man how are you' assert s.replace('man ', '') == 'hey how are you' lol := 'lol lol lol' assert lol.replace('lol', 'LOL') == 'LOL LOL LOL' b = 'oneBtwoBBthree' assert b.replace('B', '') == 'onetwothree' b = '*charptr' assert b.replace('charptr', 'byteptr') == '*byteptr' c := 'abc' assert c.replace('', '-') == c v := 'a b c d' assert v.replace(' ', ' ') == 'a b c d' } fn test_replace_each() { s := 'hello man man :)' q := s.replace_each([ 'man', 'dude', 'hello', 'hey', ]) assert q == 'hey dude dude :)' bb := '[b]bold[/b] [code]code[/code]' assert bb.replace_each([ '[b]', '', '[/b]', '', '[code]', '', '[/code]', '', ]) == 'bold code' bb2 := '[b]cool[/b]' assert bb2.replace_each([ '[b]', '', '[/b]', '', ]) == 'cool' t := 'aaaaaaaa' y := t.replace_each([ 'aa', 'b', ]) assert y == 'bbbb' s2 := 'hello_world hello' assert s2.replace_each(['hello_world', 'aaa', 'hello', 'bbb']) == 'aaa bbb' } fn test_replace_char() { assert 'azert'.replace_char(`z`, `s`, 2) == 'assert' assert '\rHello!\r'.replace_char(`\r`, `\n`, 1) == '\nHello!\n' assert 'Hello!'.replace_char(`l`, `e`, 4) == 'Heeeeeeeeeo!' assert '1141'.replace_char(`1`, `8`, 2) == '8888488' } fn test_normalize_tabs() { assert '\t\tHello!'.normalize_tabs(4) == ' Hello!' assert '\t\tHello!\t; greeting'.normalize_tabs(1) == ' Hello! ; greeting' } fn test_itoa() { num := 777 assert num.str() == '777' big := 7779998 assert big.str() == '7779998' a := 3 assert a.str() == '3' b := 5555 assert b.str() == '5555' zero := 0 assert zero.str() == '0' neg := -7 assert neg.str() == '-7' } fn test_reassign() { a := 'hi' mut b := a b += '!' assert a == 'hi' assert b == 'hi!' } fn test_runes() { s := 'привет' assert s.len == 12 s2 := 'privet' assert s2.len == 6 u := s.runes() assert u.len == 6 assert s2.substr(1, 4).len == 3 assert s2.substr(1, 4) == 'riv' assert s2[1..4].len == 3 assert s2[1..4] == 'riv' assert s2[..4].len == 4 assert s2[..4] == 'priv' assert s2[2..].len == 4 assert s2[2..] == 'ivet' assert u[1..4].string().len == 6 assert u[1..4].string() == 'рив' assert s2.substr(1, 2) == 'r' assert u[1..2].string() == 'р' assert s2.runes()[1] == `r` assert u[1] == `р` first := u[0] last := u[u.len - 1] assert first.str().len == 2 assert last.str().len == 2 } fn test_contains() { s := 'view.v' assert s.contains('vi') assert !s.contains('random') assert ''.contains('') assert 'abc'.contains('') } fn test_contains_any() { assert !'team'.contains_any('i') assert 'fail'.contains_any('ui') assert 'ure'.contains_any('ui') assert 'failure'.contains_any('ui') assert !'foo'.contains_any('') assert !''.contains_any('') } fn test_contains_only() { assert '23885'.contains_only('0123456789') assert '23gg885'.contains_only('01g23456789') assert !'hello;'.contains_only('hello') assert !''.contains_only('') } fn test_contains_any_substr() { s := 'Some random text' assert s.contains_any_substr(['false', 'not', 'rand']) assert !s.contains_any_substr(['ABC', 'invalid']) assert ''.contains_any_substr([]) assert 'abc'.contains_any_substr(['']) } fn test_arr_contains() { a := ['a', 'b', 'c'] assert a.contains('b') ints := [1, 2, 3] assert ints.contains(2) } fn test_to_num() { s := '7' assert s.int() == 7 assert s.u8() == 7 assert s.u64() == 7 f := '71.5 hasdf' // QTODO assert f.f32() == 71.5 vals := ['9'] assert vals[0].int() == 9 big := '93993993939322' assert big.u64() == 93993993939322 assert big.i64() == 93993993939322 } fn test_inter_format_string() { float_num := 1.52345 float_num_string := '-${float_num:.3f}-' assert float_num_string == '-1.523-' int_num := 7 int_num_string := '-${int_num:03d}-' assert int_num_string == '-007-' ch := `a` ch_string := '-${ch:c}-' assert ch_string == '-a-' hex_n := 192 hex_n_string := '-${hex_n:x}-' assert hex_n_string == '-c0-' oct_n := 192 oct_n_string := '-${oct_n:o}-' assert oct_n_string == '-300-' str := 'abc' str_string := '-${str:s}-' assert str_string == '-abc-' } fn test_hash() { s := '10000' assert s.hash() == 46730161 s2 := '24640' assert s2.hash() == 47778736 s3 := 'Content-Type' assert s3.hash() == 949037134 s4 := 'bad_key' assert s4.hash() == -346636507 s5 := '24640' // From a map collision test assert s5.hash() % ((1 << 20) - 1) == s.hash() % ((1 << 20) - 1) assert s5.hash() % ((1 << 20) - 1) == 592861 } fn test_trim() { assert 'banana'.trim('bna') == '' assert 'abc'.trim('ac') == 'b' assert 'aaabccc'.trim('ac') == 'b' } fn test_trim_indexes() { mut left, mut right := 0, 0 left, right = '- -- - '.trim_indexes(' -') assert left == 0 && right == 0 left, right = '- hello-world!\t'.trim_indexes(' -\t') assert left == 2 && right == 14 left, right = 'abc'.trim_indexes('ac') assert left == 1 && right == 2 } fn test_trim_left() { mut s := 'module main' assert s.trim_left(' ') == 'module main' s = ' module main' assert s.trim_left(' ') == 'module main' // test cutset s = 'banana' assert s.trim_left('ba') == 'nana' assert s.trim_left('ban') == '' } fn test_trim_right() { mut s := 'module main' assert s.trim_right(' ') == 'module main' s = 'module main ' assert s.trim_right(' ') == 'module main' // test cutset s = 'banana' assert s.trim_right('na') == 'b' assert s.trim_right('ban') == '' } fn test_all_before() { s := 'fn hello fn' assert s.all_before(' ') == 'fn' assert s.all_before('2') == s assert s.all_before('') == s } fn test_all_before_last() { s := 'fn hello fn' assert s.all_before_last(' ') == 'fn hello' assert s.all_before_last('2') == s assert s.all_before_last('') == s } fn test_all_after() { s := 'fn hello' assert s.all_after('fn ') == 'hello' assert s.all_after('test') == s assert s.all_after('') == s assert s.after('e') == 'llo' x := s.after('e') assert x == 'llo' } fn test_reverse() { assert 'hello'.reverse() == 'olleh' assert ''.reverse() == '' assert 'a'.reverse() == 'a' } fn test_bytes_to_string() { mut buf := vcalloc(10) unsafe { buf[0] = `h` buf[1] = `e` buf[2] = `l` buf[3] = `l` buf[4] = `o` } assert unsafe { buf.vstring() } == 'hello' assert unsafe { buf.vstring_with_len(2) } == 'he' bytes := [u8(`h`), `e`, `l`, `l`, `o`] assert bytes.bytestr() == 'hello' } fn test_charptr() { foo := &char('VLANG'.str) println(typeof(foo).name) assert typeof(foo).name == '&char' assert unsafe { foo.vstring() } == 'VLANG' assert unsafe { foo.vstring_with_len(3) } == 'VLA' } fn test_count() { assert ''.count('') == 0 assert ''.count('a') == 0 assert 'a'.count('') == 0 assert 'aa'.count('a') == 2 assert 'aa'.count('aa') == 1 assert 'aabbaa'.count('aa') == 2 assert 'bbaabb'.count('aa') == 1 } fn test_lower() { mut s := 'A' assert !s.is_lower() assert s.to_lower() == 'a' assert s.to_lower().len == 1 s = 'HELLO' assert !s.is_lower() assert s.to_lower() == 'hello' assert s.to_lower().len == 5 s = 'Aloha' assert !s.is_lower() assert s.to_lower() == 'aloha' s = 'Have A nice Day!' assert !s.is_lower() assert s.to_lower() == 'have a nice day!' s = 'hi' assert s.is_lower() assert s.to_lower() == 'hi' assert 'aloha!'[0] == `a` assert 'aloha!'[5] == `!` } fn test_upper() { mut s := 'a' assert !s.is_upper() assert s.to_upper() == 'A' assert s.to_upper().len == 1 s = 'hello' assert !s.is_upper() assert s.to_upper() == 'HELLO' assert s.to_upper().len == 5 s = 'Aloha' assert !s.is_upper() assert s.to_upper() == 'ALOHA' s = 'have a nice day!' assert !s.is_upper() assert s.to_upper() == 'HAVE A NICE DAY!' s = 'HI' assert s.is_upper() assert s.to_upper() == 'HI' } fn test_capitalize() { mut s := 'hello' assert !s.is_capital() assert s.capitalize() == 'Hello' s = 'test' assert !s.is_capital() assert s.capitalize() == 'Test' s = 'i am ray' assert !s.is_capital() assert s.capitalize() == 'I am ray' s = '' assert !s.is_capital() assert s.capitalize() == '' s = 'TEST IT' assert !s.is_capital() assert s.capitalize() == 'TEST IT' s = 'Test it' assert s.is_capital() assert s.capitalize() == 'Test it' assert 'GameMission_t'.capitalize() == 'GameMission_t' } fn test_title() { mut s := 'hello world' assert !s.is_title() assert s.title() == 'Hello World' s = 'HELLO WORLD' assert !s.is_title() assert s.title() == 'HELLO WORLD' s = 'Hello World' assert s.is_title() assert s.title() == 'Hello World' } fn test_for_loop() { mut i := 0 s := 'abcd' for c in s { assert c == s[i] i++ } } fn test_for_loop_two() { s := 'abcd' for i, c in s { assert c == s[i] } } fn test_quote() { a := `'` println('testing double quotes') b := 'hi' assert b == 'hi' assert a.str() == "'" } fn test_limit() { s := 'hello' assert s.limit(2) == 'he' assert s.limit(9) == s assert s.limit(0) == '' // assert s.limit(-1) == '' } fn test_repeat() { s1 := 'V! ' assert s1.repeat(5) == 'V! V! V! V! V! ' assert s1.repeat(1) == s1 assert s1.repeat(0) == '' s2 := '' assert s2.repeat(5) == s2 assert s2.repeat(1) == s2 assert s2.repeat(0) == s2 // TODO Add test for negative values } fn test_starts_with() { s := 'V Programming Language' assert s.starts_with('V') == true assert s.starts_with('V Programming') == true assert s.starts_with('Language') == false } fn test_starts_with_capital() { assert 'A sentence'.starts_with_capital() assert 'A paragraph. It also does.'.starts_with_capital() assert ''.starts_with_capital() == false assert 'no'.starts_with_capital() == false assert ' No'.starts_with_capital() == false } fn test_trim_string_left() { s := 'V Programming Language' assert s.trim_string_left('V ') == 'Programming Language' assert s.trim_string_left('V Programming ') == 'Language' assert s.trim_string_left('Language') == s s2 := 'TestTestTest' assert s2.trim_string_left('Test') == 'TestTest' assert s2.trim_string_left('TestTest') == 'Test' s3 := '123Test123Test' assert s3.trim_string_left('123') == 'Test123Test' assert s3.trim_string_left('123Test') == '123Test' } fn test_trim_string_right() { s := 'V Programming Language' assert s.trim_string_right(' Language') == 'V Programming' assert s.trim_string_right(' Programming Language') == 'V' assert s.trim_string_right('V') == s s2 := 'TestTestTest' assert s2.trim_string_right('Test') == 'TestTest' assert s2.trim_string_right('TestTest') == 'Test' s3 := '123Test123Test' assert s3.trim_string_right('123') == s3 assert s3.trim_string_right('123Test') == '123Test' } fn test_raw() { raw := r'raw\nstring' lines := raw.split('\n') println(lines) assert lines.len == 1 println('raw string: "${raw}"') raw2 := r'Hello V\0' assert raw2[7] == `\\` assert raw2[8] == `0` raw3 := r'Hello V\x00' assert raw3[7] == `\\` assert raw3[8] == `x` assert raw3[9] == `0` assert raw3[10] == `0` } fn test_raw_with_quotes() { raw := r"some'" + r'"thing' // " should be escaped in the generated C code assert raw[0] == `s` assert raw[5] == `"` assert raw[6] == `t` } fn test_escape() { a := 10 println("\"${a}") assert "\"${a}" == '"10' } fn test_atoi() { assert '234232'.int() == 234232 assert '-9009'.int() == -9009 assert '0'.int() == 0 for n in -10000 .. 100000 { s := n.str() assert s.int() == n } } fn test_raw_inter() { world := 'world' println(world) s := r'hello\n$world' assert s == r'hello\n$world' assert s.contains('$') } fn test_c_r() { // This used to break because of r'' and c'' c := 42 println('${c}') r := 50 println('${r}') } fn test_inter_before_comptime_if() { s := '123' // This used to break ('123 $....') $if linux { println(s) } assert s == '123' } fn test_double_quote_inter() { a := 1 b := 2 println('${a} ${b}') assert '${a} ${b}' == '1 2' assert '${a} ${b}' == '1 2' } fn foo(b u8) u8 { return b - 10 } fn filter(b u8) bool { return b != `a` } fn test_split_into_lines() { line_content := 'Line' text_crlf := '${line_content}\r\n${line_content}\r\n${line_content}' lines_crlf := text_crlf.split_into_lines() assert lines_crlf.len == 3 for line in lines_crlf { assert line == line_content } text_lf := '${line_content}\n${line_content}\n${line_content}' lines_lf := text_lf.split_into_lines() assert lines_lf.len == 3 for line in lines_lf { assert line == line_content } } fn test_string_literal_with_backslash() { a := 'HelloWorld' assert a == 'HelloWorld' b := 'OneTwoThree' assert b == 'OneTwoThree' } /* type MyString = string fn test_string_alias() { s := MyString('hi') ss := s + '!' } */ // sort an array of structs, by their string field values struct Ka { s string i int } fn test_sorter() { mut arr := [ Ka{ s: 'bbb' i: 100 }, Ka{ s: 'aaa' i: 101 }, Ka{ s: 'ccc' i: 102 }, ] cmp := fn (a &Ka, b &Ka) int { return compare_strings(a.s, b.s) } arr.sort_with_compare(cmp) assert arr[0].s == 'aaa' assert arr[0].i == 101 assert arr[1].s == 'bbb' assert arr[1].i == 100 assert arr[2].s == 'ccc' assert arr[2].i == 102 } fn test_fields() { assert 'a bcde'.fields() == ['a', 'bcde'] assert ' sss \t ssss '.fields() == ['sss', 'ssss'] assert '\n xyz \t abc def'.fields() == ['xyz', 'abc', 'def'] assert 'hello'.fields() == ['hello'] assert ''.fields() == [] } fn test_interpolation_after_quoted_variable_still_works() { rr := 'abc' tt := 'xyz' // Basic interpolation, no internal quotes yy := 'Replacing ${rr} with ${tt}' assert yy == 'Replacing abc with xyz' // Interpolation after quoted variable ending with 'r'quote // that may be mistaken with the start of a raw string, // ensure that it is not. ss := 'Replacing "${rr}" with "${tt}"' assert ss == 'Replacing "abc" with "xyz"' zz := "Replacing '${rr}' with '${tt}'" assert zz == "Replacing 'abc' with 'xyz'" // Interpolation after quoted variable ending with 'c'quote // may be mistaken with the start of a c string, so // check it is not. cc := 'abc' ccc := "Replacing '${cc}' with '${tt}'" assert ccc == "Replacing 'abc' with 'xyz'" cccq := 'Replacing "${cc}" with "${tt}"' assert cccq == 'Replacing "abc" with "xyz"' } fn test_emoji_to_runes() { x := '👋' assert x.runes()[0] == `👋` } fn test_string_to_rune() { x := 'Hello World 👋' assert x.runes().len == 13 } fn test_index_any() { x := 'abcdefghij' assert x.index_any('ef') == 4 assert x.index_any('fe') == 4 } fn test_string_f64() { assert ''.f64() == 0 assert '123'.f64() == 123 assert '-123'.f64() == -123 assert '-123.456'.f64() == -123.456 } const f32_epsilon = 0.0000000001 fn test_string_f32() { assert ''.f32() - 0 <= f32_epsilon assert '123'.f32() - 123 < f32_epsilon assert '-123'.f32() - (-123) < f32_epsilon assert '-123.456'.f32() - (-123.456) <= f32_epsilon } fn test_string_is_ascii() { assert ''.is_ascii() == true assert ' '.is_ascii() == true assert '~~'.is_ascii() == true assert ' Az~'.is_ascii() == true assert ' Aö~'.is_ascii() == false assert '👋'.is_ascii() == false assert 'a👋bc'.is_ascii() == false } fn test_string_with_zero_byte_escape() { assert '\x00'.bytes() == [u8(0)] }