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diff --git a/dom/localstorage/test/unit/test_stringLength2.js b/dom/localstorage/test/unit/test_stringLength2.js
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index 0000000000..830890fff7
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+++ b/dom/localstorage/test/unit/test_stringLength2.js
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+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+/**
+ * This test is mainly to verify that string length is correctly computed for
+ * database values containing NULs. See bug 1541681.
+ */
+
+async function testSteps() {
+  const principal = getPrincipal("http://example.org");
+
+  const data = {};
+  data.key = "foobar";
+  data.secondKey = "foobaz";
+  data.value = {
+    length: 19253,
+  };
+  data.usage = data.key.length + data.value.length;
+
+  async function checkUsage(expectedUsage) {
+    info("Checking usage");
+
+    // This forces any pending changes to be flushed to disk.  It also forces
+    // data to be reloaded from disk at next localStorage API call.
+    request = resetOrigin(principal);
+    await requestFinished(request);
+
+    request = getOriginUsage(principal);
+    await requestFinished(request);
+
+    is(request.result.usage, expectedUsage, "Correct usage");
+  }
+
+  info("Setting pref");
+
+  Services.prefs.setBoolPref("dom.storage.next_gen", true);
+
+  info("Stage 1 - Checking usage after profile installation");
+
+  info("Clearing");
+
+  let request = clear();
+  await requestFinished(request);
+
+  info("Installing package");
+
+  // The profile contains storage.sqlite and webappsstore.sqlite.
+  installPackage("stringLength2_profile");
+
+  await checkUsage(0);
+
+  info("Stage 2 - Checking usage after archived data migration");
+
+  info("Opening database");
+
+  let storage = getLocalStorage(principal);
+  storage.open();
+
+  await checkUsage(data.usage);
+
+  info("Stage 3 - Checking usage after copying the value");
+
+  info("Adding a second copy of the value");
+
+  let value = storage.getItem(data.key);
+  storage.setItem(data.secondKey, value);
+
+  await checkUsage(2 * data.usage);
+
+  info("Stage 4 - Checking length of the copied value");
+
+  value = storage.getItem(data.secondKey);
+  ok(value.length === data.value.length, "Correct string length");
+}