v/vlib/builtin/string_test.v

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import strings
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// Copyright (c) 2019-2022 Alexander Medvednikov. All rights reserved.
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// 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
}
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fn test_add() {
mut a := 'a'
a += 'b'
assert a == ('ab')
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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 ''.len_utf8() == 2
assert 'Слово'.len_utf8() == 5
assert 'Λέξη'.len_utf8() == 4
}
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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
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}
fn test_between() {
s := 'hello [man] how you doing'
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assert s.find_between('[', ']') == 'man'
}
fn test_compare() {
a := 'Music'
b := 'src'
assert b >= a
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}
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fn test_lt() {
a := ''
b := 'a'
c := 'a'
d := 'b'
e := 'aa'
f := 'ab'
assert a < b
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assert !(b < c)
assert c < d
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assert !(d < e)
assert c < e
assert e < f
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}
fn test_ge() {
a := 'aa'
b := 'aa'
c := 'ab'
d := 'abc'
e := 'aaa'
assert b >= a
assert c >= b
assert d >= c
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assert !(c >= d)
assert e >= a
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}
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
}
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fn test_sort() {
mut vals := [
'arr',
'an',
'a',
'any',
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]
len := vals.len
vals.sort()
assert len == vals.len
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assert vals[0] == 'a'
assert vals[1] == 'an'
assert vals[2] == 'any'
assert vals[3] == 'arr'
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}
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'
}
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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..]?
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}
fn ranges_propagate_last(s string) ?string {
return s[..20]?
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}
fn ranges_propagate_both(s string) ?string {
return s[1..20]?
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}
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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
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}
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)'
}
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fn test_split() {
mut s := 'volt/twitch.v:34'
mut vals := s.split(':')
assert vals.len == 2
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assert vals[0] == 'volt/twitch.v'
assert vals[1] == '34'
// /////////
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s = '2018-01-01z13:01:02'
vals = s.split('z')
assert vals.len == 2
assert vals[0] == '2018-01-01'
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assert vals[1] == '13:01:02'
// //////////
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s = '4627a862c3dec29fb3182a06b8965e0025759e18___1530207969___blue'
vals = s.split('___')
assert vals.len == 3
assert vals[0] == '4627a862c3dec29fb3182a06b8965e0025759e18'
assert vals[1] == '1530207969'
assert vals[2] == 'blue'
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// /////////
s = 'lalala'
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vals = s.split('a')
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assert vals.len == 4
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assert vals[0] == 'l'
assert vals[1] == 'l'
assert vals[2] == 'l'
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assert vals[3] == ''
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// /////////
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] == ''
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}
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']
}
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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']
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mut s := strings.join(' ')
assert s == 'a b c'
strings = [
'one
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two ',
'three!
four!',
]
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s = strings.join(' ')
assert s.contains('one') && s.contains('two ') && s.contains('four')
empty := []string{len: 0}
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assert empty.join('A') == ''
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}
fn test_clone() {
mut a := 'a'
a += 'a'
a += 'a'
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b := a
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c := a.clone()
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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!')
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b = b.replace('!', '')
assert b == ('hello world')
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b = b.replace('h', 'H')
assert b == ('Hello world')
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b = b.replace('foo', 'bar')
assert b == ('Hello world')
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s := 'hey man how are you'
assert s.replace('man ', '') == 'hey how are you'
lol := 'lol lol lol'
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assert lol.replace('lol', 'LOL') == 'LOL LOL LOL'
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b = 'oneBtwoBBthree'
assert b.replace('B', '') == 'onetwothree'
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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'
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}
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fn test_replace_each() {
s := 'hello man man :)'
q := s.replace_each([
'man',
'dude',
'hello',
'hey',
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])
assert q == 'hey dude dude :)'
bb := '[b]bold[/b] [code]code[/code]'
assert bb.replace_each([
'[b]',
'<b>',
'[/b]',
'</b>',
'[code]',
'<code>',
'[/code]',
'</code>',
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]) == '<b>bold</b> <code>code</code>'
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bb2 := '[b]cool[/b]'
assert bb2.replace_each([
'[b]',
'<b>',
'[/b]',
'</b>',
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]) == '<b>cool</b>'
t := 'aaaaaaaa'
y := t.replace_each([
'aa',
'b',
])
assert y == 'bbbb'
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s2 := 'hello_world hello'
assert s2.replace_each(['hello_world', 'aaa', 'hello', 'bbb']) == 'aaa bbb'
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}
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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
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u := s.runes()
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assert u.len == 6
assert s2.substr(1, 4).len == 3
assert s2.substr(1, 4) == 'riv'
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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'
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assert u[1..4].string().len == 6
assert u[1..4].string() == 'рив'
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assert s2.substr(1, 2) == 'r'
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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
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}
fn test_contains() {
s := 'view.v'
assert s.contains('vi')
assert !s.contains('random')
assert ''.contains('')
assert 'abc'.contains('')
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}
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_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([''])
}
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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'
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assert s.int() == 7
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assert s.u8() == 7
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assert s.u64() == 7
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f := '71.5 hasdf'
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// QTODO
assert f.f32() == 71.5
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vals := ['9']
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assert vals[0].int() == 9
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big := '93993993939322'
assert big.u64() == 93993993939322
assert big.i64() == 93993993939322
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}
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fn test_inter_format_string() {
float_num := 1.52345
float_num_string := '-${float_num:.3f}-'
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assert float_num_string == '-1.523-'
int_num := 7
int_num_string := '-${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-'
}
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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
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}
fn test_trim() {
assert 'banana'.trim('bna') == ''
assert 'abc'.trim('ac') == 'b'
assert 'aaabccc'.trim('ac') == 'b'
}
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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'
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assert s.trim_left('ban') == ''
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}
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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'
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assert s.trim_right('ban') == ''
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}
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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
}
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fn test_all_after() {
s := 'fn hello'
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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'
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}
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fn test_reverse() {
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assert 'hello'.reverse() == 'olleh'
assert ''.reverse() == ''
assert 'a'.reverse() == 'a'
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}
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fn test_bytes_to_string() {
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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'
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bytes := [u8(`h`), `e`, `l`, `l`, `o`]
assert bytes.bytestr() == 'hello'
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}
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
}
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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'
}
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fn test_capitalize() {
mut s := 'hello'
assert !s.is_capital()
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assert s.capitalize() == 'Hello'
s = 'test'
assert !s.is_capital()
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assert s.capitalize() == 'Test'
s = 'i am ray'
assert !s.is_capital()
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assert s.capitalize() == 'I am ray'
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s = ''
assert !s.is_capital()
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assert s.capitalize() == ''
s = 'TEST IT'
assert !s.is_capital()
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assert s.capitalize() == 'TEST IT'
s = 'Test it'
assert s.is_capital()
assert s.capitalize() == 'Test it'
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assert 'GameMission_t'.capitalize() == 'GameMission_t'
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}
fn test_title() {
mut s := 'hello world'
assert !s.is_title()
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assert s.title() == 'Hello World'
s = 'HELLO WORLD'
assert !s.is_title()
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assert s.title() == 'HELLO WORLD'
s = 'Hello World'
assert s.is_title()
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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]
}
}
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fn test_quote() {
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a := `'`
println('testing double quotes')
b := 'hi'
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assert b == 'hi'
assert a.str() == "'"
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}
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fn test_limit() {
s := 'hello'
assert s.limit(2) == 'he'
assert s.limit(9) == s
assert s.limit(0) == ''
// assert s.limit(-1) == ''
}
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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
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}
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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'
}
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fn test_raw() {
raw := r'raw\nstring'
lines := raw.split('\n')
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println(lines)
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assert lines.len == 1
println('raw string: "$raw"')
raw2 := r'Hello V\0'
assert raw2[7] == `\\`
assert raw2[8] == `0`
raw3 := r'Hello V\x00'
assert raw3[7] == `\\`
assert raw3[8] == `x`
assert raw3[9] == `0`
assert raw3[10] == `0`
}
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fn test_raw_with_quotes() {
raw := r"some'" + r'"thing' // " should be escaped in the generated C code
assert raw[0] == `s`
assert raw[5] == `"`
assert raw[6] == `t`
}
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fn test_escape() {
a := 10
println("\"$a")
assert "\"$a" == '"10'
}
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fn test_atoi() {
assert '234232'.int() == 234232
assert '-9009'.int() == -9009
assert '0'.int() == 0
for n in -10000 .. 100000 {
s := n.str()
assert s.int() == n
}
}
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fn test_raw_inter() {
world := 'world'
println(world)
s := r'hello\n$world'
assert s == r'hello\n$world'
assert s.contains('$')
}
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fn test_c_r() {
// This used to break because of r'' and c''
c := 42
println('$c')
r := 50
println('$r')
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}
fn test_inter_before_comptime_if() {
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s := '123'
// This used to break ('123 $....')
$if linux {
println(s)
}
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assert s == '123'
}
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fn test_double_quote_inter() {
a := 1
b := 2
println('$a $b')
assert '$a $b' == '1 2'
assert '$a $b' == '1 2'
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}
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fn foo(b u8) u8 {
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return b - 10
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}
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fn filter(b u8) bool {
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return b != `a`
}
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fn test_split_into_lines() {
line_content := 'Line'
text_crlf := '$line_content\r\n$line_content\r\n$line_content'
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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'
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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'
}
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/*
type MyString = string
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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
},
]
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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"'
}
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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
}
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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() {
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assert '\x00'.bytes() == [u8(0)]
}