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diff --git a/comm/mailnews/base/test/unit/test_folderLookupService.js b/comm/mailnews/base/test/unit/test_folderLookupService.js
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/**
+ * This tests that nsIFolderLookupService works according to specification.
+ */
+var { AppConstants } = ChromeUtils.importESModule(
+  "resource://gre/modules/AppConstants.sys.mjs"
+);
+var kRootURI = "mailbox://nobody@Local%20Folders";
+
+add_task(async function test_fls_basics() {
+  let fls = Cc["@mozilla.org/mail/folder-lookup;1"].getService(
+    Ci.nsIFolderLookupService
+  );
+
+  // Make sure that the local mail account exists.
+  localAccountUtils.loadLocalMailAccount();
+
+  // There should exist an inbox.
+  Assert.equal(
+    fls.getFolderForURL(kRootURI + "/Inbox"),
+    localAccountUtils.inboxFolder
+  );
+
+  // Can we get the root folder?
+  let root = localAccountUtils.rootFolder;
+  Assert.equal(fls.getFolderForURL(kRootURI), root);
+
+  // The child folder Child doesn't exist yet... make sure that fls doesn't
+  // return it yet
+  Assert.equal(fls.getFolderForURL(kRootURI + "/Child"), null);
+
+  // Create the Child folder, and test we can find it.
+  // (NOTE: createSubFolder() can be async for IMAP folders. But for now
+  // we know we're using local folders and it'll happen right away).
+  root.createSubfolder("Child", null);
+  Assert.equal(
+    fls.getFolderForURL(kRootURI + "/Child"),
+    root.getChildNamed("Child")
+  );
+
+  // Try it again... it should load from cache this time.
+  Assert.equal(
+    fls.getFolderForURL(kRootURI + "/Child"),
+    root.getChildNamed("Child")
+  );
+
+  // Now delete the folder; we should be unable to find it
+  root.propagateDelete(root.getChildNamed("Child"), true);
+  Assert.equal(fls.getFolderForURL(kRootURI + "/Child"), null);
+
+  Assert.equal(fls.getFolderForURL(kRootURI + "/"), null);
+  Assert.equal(
+    fls.getFolderForURL("mailbox://idonotexist@Local%20Folders"),
+    null
+  );
+});
+
+add_task(async function test_unicode_uris() {
+  let fls = Cc["@mozilla.org/mail/folder-lookup;1"].getService(
+    Ci.nsIFolderLookupService
+  );
+  localAccountUtils.loadLocalMailAccount();
+  let root = localAccountUtils.rootFolder;
+
+  // Create a folder with non-ASCII characters.
+  // Unicode abuse - dotless letter i and a metal umlaut over the n.
+  let tapName = "Sp\u0131n\u0308al Tap";
+  root.createSubfolder(tapName, null);
+
+  // Make sure we can find it.
+  // (URI is percent-escaped utf-8)
+  let tapNameEscaped = "Sp%C4%B1n%CC%88al%20Tap";
+  if (AppConstants.platform == "win") {
+    // For !ConvertibleToNative(), folder name is hashed on Windows.
+    tapNameEscaped = "a2d874f7";
+  }
+  let tapURI = kRootURI + "/" + tapNameEscaped;
+  let tap = fls.getFolderForURL(tapURI);
+  Assert.equal(tap.URI, tapURI);
+});