Add a grapheme cluster test for emoji flags (#4781)

Fixed #4780.
unicode-org · Apr 8, 2024 · 16b770c · 16b770c
1 parent f0f6060
commit 16b770c
Showing 1 changed file with 8 additions and 0 deletions.
diff --git a/components/segmenter/src/grapheme.rs b/components/segmenter/src/grapheme.rs
@@ -268,3 +268,11 @@ fn empty_string() {
     let breaks: Vec<usize> = segmenter.segment_str("").collect();
     assert_eq!(breaks, [0]);
 }
+
+#[test]
+fn emoji_flags() {
+    // https://github.com/unicode-org/icu4x/issues/4780
+    let segmenter = GraphemeClusterSegmenter::new();
+    let breaks: Vec<usize> = segmenter.segment_str("🇺🇸🏴󠁧󠁢󠁥󠁮󠁧󠁿").collect();
+    assert_eq!(breaks, [0, 8, 36]);
+}