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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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+/**
+ * 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.
+ */
+
+add_task(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.enable_unsupported_legacy_implementation",
+ false
+ );
+
+ 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");
+});