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diff --git a/js/src/tests/test262/built-ins/RegExp/lookBehind/word-boundary.js b/js/src/tests/test262/built-ins/RegExp/lookBehind/word-boundary.js
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+++ b/js/src/tests/test262/built-ins/RegExp/lookBehind/word-boundary.js
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+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-assertion
+description: Word boundary
+info: |
+  The production Assertion :: (?<=Disjunction) evaluates as follows:
+    1. Evaluate Disjunction with -1 as its direction argument to obtain a Matcher m.
+    2. Return an internal Matcher closure that takes two arguments, a State x and a Continuation
+        c, and performs the following steps:
+      a. Let d be a Continuation that always returns its State argument as a successful MatchResult.
+      b. Call m(x, d) and let r be its result.
+      c. If r is failure, return failure.
+      d. Let y be r's State.
+      e. Let cap be y's captures List.
+      f. Let xe be x's endIndex.
+      g. Let z be the State (xe, cap).
+      h. Call c(z) and return its result.
+features: [regexp-lookbehind]
+includes: [compareArray.js]
+---*/
+
+// Word boundary matches.
+assert.compareArray("abc def".match(/(?<=\b)[d-f]{3}/), ["def"], "#1");
+assert.compareArray("ab cdef".match(/(?<=\B)\w{3}/), ["def"], "#2");
+assert.compareArray("ab cdef".match(/(?<=\B)(?<=c(?<=\w))\w{3}/), ["def"], "#3");
+assert.sameValue("abcdef".match(/(?<=\b)[d-f]{3}/), null, "#4");
+
+reportCompare(0, 0);