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Add test for is_char_boundary #32869

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Apr 15, 2016
Merged

Add test for is_char_boundary #32869

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16 changes: 16 additions & 0 deletions src/libcollectionstest/str.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -346,6 +346,22 @@ fn test_slice_fail() {
&"中华Việt Nam"[0..2];
}


#[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);
}
}
}
const LOREM_PARAGRAPH: &'static 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 \
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