1 files changed, 60 insertions, 0 deletions
diff --git a/js/src/tests/test262/intl402/Segmenter/prototype/segment/containing/unbreakable-input.js b/js/src/tests/test262/intl402/Segmenter/prototype/segment/containing/unbreakable-input.js
new file mode 100644
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+++ b/js/src/tests/test262/intl402/Segmenter/prototype/segment/containing/unbreakable-input.js
@@ -0,0 +1,60 @@
+// |reftest| skip-if(!Intl.Segmenter) -- Intl.Segmenter is not enabled unconditionally
+// Copyright 2020 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-%segmentsprototype%.containing
+description: Verifies the cases which the input is unbreakable.
+info: |
+    %Segments.prototype%.containing ( index )
+
+    8. Let startIndex be ! FindBoundary(segmenter, string, n, before).
+    9. Let endIndex be ! FindBoundary(segmenter, string, n, after).
+
+features: [Intl.Segmenter]
+---*/
+
+const granularities = [undefined, "grapheme", "word", "sentence"];
+// The following all contains only one segment in any granularity.
+const inputs = [
+    "a",
+    " ",
+    "\ud800\udc00", // surrogate
+    "\ud800", // only leading surrogate
+    "\udc00", // only trailing surrogate
+    "台", // a Han character
+    "\u0301", // a modifier
+    "a\u0301", // ASCII + a modifier
+    "ซิ่", // a Thai cluster
+    "𐂰",  // a Surrogate pair
+    "\uD83D\uDC4B\uD83C\uDFFB", // Emoji short sequence: waving_hand_light_skin_tone
+    "\uD83D\uDC68\uD83C\uDFFB\u200D\uD83E\uDDB0", // Emoji long sequence: man_light_skin_tone_red_hair
+    "\u1102",  // Jamo L
+    "\u1162",  // Jamo V
+    "\u11A9",  // Jamo T
+    "\u1102\u1162",  // Jamo LV
+    "\u1102\u1162\u11A9",  // Jamo LVT
+    "\u1102\u1102",  // Jamo L L
+    "\u1102\u1102\u1162",  // Jamo L L V
+    "\u1102\u1102\u1162\u11A9",  // Jamo L L V T
+    "\u1162\u1162",  // Jamo V V
+    "\u1162\u11A9",  // Jamo V T
+    "\u1102\u1162\u1162",  // Jamo V V
+    "\u11A9\u11A9",  // Jamo T T
+    "\u1102\u1162\u11A9\u11A9",  // Jamo LVT T
+];
+
+granularities.forEach(
+    function(granularity) {
+      const segmenter = new Intl.Segmenter(undefined, {granularity});
+      inputs.forEach(function(input) {
+        const segment = segmenter.segment(input);
+        for (let index = 0; index < input.length; index++) {
+          const result = segment.containing(index);
+          assert.sameValue(0, result.index);
+          assert.sameValue(input, result.input);
+          assert.sameValue(input, result.segment);
+        }
+      });
+    });
+
+reportCompare(0, 0);