1 files changed, 57 insertions, 0 deletions
diff --git a/js/src/tests/non262/Intl/Segmenter/surrogate-pair-split.js b/js/src/tests/non262/Intl/Segmenter/surrogate-pair-split.js
new file mode 100644
index 0000000000..e7c9fcf727
--- /dev/null
+++ b/js/src/tests/non262/Intl/Segmenter/surrogate-pair-split.js
@@ -0,0 +1,57 @@
+// |reftest| skip-if(!this.hasOwnProperty('Intl')||!this.Intl.Segmenter)
+
+// Calling %Segments.prototype%.containing in the middle of a surrogate pair
+// doubles back to the lead surrogate.
+
+// Grapheme
+{
+  let segmenter = new Intl.Segmenter(undefined, {granularity: "grapheme"});
+
+  let string = "\u{1F925}";
+  let segments = segmenter.segment(string);
+
+  let data1 = segments.containing(0);
+  let data2 = segments.containing(1);
+  let data3 = segments.containing(2);
+
+  assertEq(data1.segment, string);
+  assertDeepEq(data1, data2);
+  assertEq(data3, undefined);
+}
+
+// Word
+{
+  let segmenter = new Intl.Segmenter(undefined, {granularity: "word"});
+
+  let prefix = "Nothing to see here! ";
+  let string = "\u{1F925}";
+  let segments = segmenter.segment(prefix + string);
+
+  let data1 = segments.containing(prefix.length + 0);
+  let data2 = segments.containing(prefix.length + 1);
+  let data3 = segments.containing(prefix.length + 2);
+
+  assertEq(data1.segment, string);
+  assertDeepEq(data1, data2);
+  assertEq(data3, undefined);
+}
+
+// Sentence
+{
+  let segmenter = new Intl.Segmenter(undefined, {granularity: "sentence"});
+
+  let prefix = "Nothing to see here! Please disperse. ";
+  let string = "\u{1F925}";
+  let segments = segmenter.segment(prefix + string);
+
+  let data1 = segments.containing(prefix.length + 0);
+  let data2 = segments.containing(prefix.length + 1);
+  let data3 = segments.containing(prefix.length + 2);
+
+  assertEq(data1.segment, string);
+  assertDeepEq(data1, data2);
+  assertEq(data3, undefined);
+}
+
+if (typeof reportCompare === "function")
+  reportCompare(0, 0);