1 files changed, 70 insertions, 0 deletions
diff --git a/js/src/tests/test262/intl402/Segmenter/prototype/segment/containing/one-index.js b/js/src/tests/test262/intl402/Segmenter/prototype/segment/containing/one-index.js
new file mode 100644
index 0000000000..b23683ef99
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+++ b/js/src/tests/test262/intl402/Segmenter/prototype/segment/containing/one-index.js
@@ -0,0 +1,70 @@
+// |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 value of index turn into 1.
+info: |
+    %Segments.prototype%.containing ( index )
+
+    6. Let n be ? ToInteger(index).
+    7. If n < 0 or n ≥ len, return undefined.
+    8. Let startIndex be ! FindBoundary(segmenter, string, n, before).
+
+    ToInteger ( argument )
+    1. Let number be ? ToNumber(argument).
+    2. If number is NaN, +0, or -0, return +0.
+    4. Let integer be the Number value that is the same sign as number and whose magnitude is floor(abs(number)).
+    5. If integer is -0, return +0.
+    6. Return integer.
+
+    ToNumber ( argument )
+    Undefined | Return NaN.
+    Null      | Return +0.
+    Boolean   | If argument is true, return 1. If argument is false, return +0.
+
+features: [Intl.Segmenter]
+---*/
+
+const input = "a c";
+const granularities = [undefined, "grapheme", "word"];
+const index_to_one = [
+    1,
+    1.49,
+    14.9E-1,
+    14.9e-1,
+    "1.49",
+    "14.9E-1",
+    "14.9e-1",
+    true,
+    { toString(){ return "1"; } },
+    { valueOf(){ return 1; } },
+    { [Symbol.toPrimitive](){ return 1; } },
+];
+
+// Except granularity: "sentence", check the result.segment is " ".
+granularities.forEach(
+    function(granularity) {
+      const segmenter = new Intl.Segmenter(undefined, {granularity});
+      const segment = segmenter.segment(input);
+      index_to_one.forEach(function(index) {
+        const result = segment.containing(index);
+        const msg = "granularity: " + granularity + " index: " + index;
+        assert.sameValue(1, result.index, msg + " index");
+        assert.sameValue(" ", result.segment, msg + " segment");
+        assert.sameValue(input, result.input, msg + " input");
+      });
+    });
+
+// For granularity: "sentence", result.segment is input
+const segmenter = new Intl.Segmenter(undefined, {granularity: "sentence"});
+const segment = segmenter.segment(input);
+index_to_one.forEach(function(index) {
+  const result = segment.containing(index);
+  const msg = "granularity: sentence index: " + index;
+  assert.sameValue(0, result.index, msg + " index");
+  assert.sameValue(input, result.segment, msg + " segment");
+  assert.sameValue(input, result.input, msg + " input");
+});
+
+reportCompare(0, 0);