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make utf8_char_counts test faster in Miri #95532

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Apr 1, 2022
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make utf8_char_counts test faster in Miri #95532

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11 changes: 7 additions & 4 deletions library/alloc/tests/str.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -2234,11 +2234,14 @@ fn utf8_chars() {
#[test]
fn utf8_char_counts() {
let strs = [("e", 1), ("é", 1), ("€", 1), ("\u{10000}", 1), ("eé€\u{10000}", 4)];
let mut reps =
[8, 64, 256, 512, 1024].iter().copied().flat_map(|n| n - 8..=n + 8).collect::<Vec<usize>>();
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::<Vec<usize>>();
if cfg!(not(miri)) {
let big = 1 << 16;
reps.extend(big - 8..=big + 8);
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::<Vec<String>>();
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