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diff --git a/js/src/tests/test262/built-ins/RegExp/CharacterClassEscapes/shell.js b/js/src/tests/test262/built-ins/RegExp/CharacterClassEscapes/shell.js
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index 0000000000..3c80817b09
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+++ b/js/src/tests/test262/built-ins/RegExp/CharacterClassEscapes/shell.js
@@ -0,0 +1,60 @@
+// GENERATED, DO NOT EDIT
+// file: regExpUtils.js
+// Copyright (C) 2017 Mathias Bynens.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+description: |
+    Collection of functions used to assert the correctness of RegExp objects.
+defines: [buildString, testPropertyEscapes, matchValidator]
+---*/
+
+function buildString({ loneCodePoints, ranges }) {
+  const CHUNK_SIZE = 10000;
+  let result = Reflect.apply(String.fromCodePoint, null, loneCodePoints);
+  for (let i = 0; i < ranges.length; i++) {
+    const range = ranges[i];
+    const start = range[0];
+    const end = range[1];
+    const codePoints = [];
+    for (let length = 0, codePoint = start; codePoint <= end; codePoint++) {
+      codePoints[length++] = codePoint;
+      if (length === CHUNK_SIZE) {
+        result += Reflect.apply(String.fromCodePoint, null, codePoints);
+        codePoints.length = length = 0;
+      }
+    }
+    result += Reflect.apply(String.fromCodePoint, null, codePoints);
+  }
+  return result;
+}
+
+function testPropertyEscapes(regex, string, expression) {
+  if (!regex.test(string)) {
+    for (const symbol of string) {
+      const hex = symbol
+        .codePointAt(0)
+        .toString(16)
+        .toUpperCase()
+        .padStart(6, "0");
+      assert(
+        regex.test(symbol),
+        `\`${ expression }\` should match U+${ hex } (\`${ symbol }\`)`
+      );
+    }
+  }
+}
+
+// Returns a function that will validate RegExp match result
+//
+// Example:
+//
+//    var validate = matchValidator(['b'], 1, 'abc');
+//    validate(/b/.exec('abc'));
+//
+function matchValidator(expectedEntries, expectedIndex, expectedInput) {
+  return function(match) {
+    assert.compareArray(match, expectedEntries, 'Match entries');
+    assert.sameValue(match.index, expectedIndex, 'Match index');
+    assert.sameValue(match.input, expectedInput, 'Match input');
+  }
+}