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diff --git a/deps/v8/test/mjsunit/es8/async-await-interleaved.js b/deps/v8/test/mjsunit/es8/async-await-interleaved.js
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+// Copyright 2018 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
+//       disclaimer in the documentation and/or other materials provided
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Check for correct interleaving of Promises and async/await
+(function () {
+  const iterations = 10;
+  let promiseCounter = iterations;
+  let awaitCounter = 0;
+
+  async function check(v) {
+    awaitCounter = v;
+    // The following checks ensure that "await" takes 3 ticks on the
+    // microtask queue. Note: this will change in the future
+    if (awaitCounter === 0) {
+      assertEquals(iterations, promiseCounter);
+    } else if (awaitCounter <= Math.floor(iterations / 3)) {
+      assertEquals(iterations - awaitCounter * 3, promiseCounter);
+    } else {
+      assertEquals(0, promiseCounter);
+    }
+  }
+
+  async function f() {
+    for (let i = 0; i < iterations; i++) {
+      await check(i);
+    }
+    return 0;
+  }
+
+  function countdown(v) {
+    promiseCounter = v;
+    if (v > 0) Promise.resolve(v - 1).then(countdown);
+  }
+
+  countdown(iterations);
+  f();
+})();