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diff --git a/test/lisp/emacs-lisp/find-func-tests.el b/test/lisp/emacs-lisp/find-func-tests.el
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+++ b/test/lisp/emacs-lisp/find-func-tests.el
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+;;; find-func-tests.el --- Unit tests for find-func.el  -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2020 Free Software Foundation, Inc.
+
+;; Author: Stefan Monnier <monnier@iro.umontreal.ca>
+;; Keywords:
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs is free software: you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; GNU Emacs is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;;
+
+;;; Code:
+
+(require 'ert-x)                        ;For `ert-run-keys'.
+
+(ert-deftest find-func-tests--library-completion () ;bug#43393
+  ;; FIXME: How can we make this work in batch (see also
+  ;; `mule-cmds--test-universal-coding-system-argument')?
+  ;; (skip-unless (not noninteractive))
+  ;; Check that `partial-completion' works when completing library names.
+  (should (equal "org/org"
+                 (ert-simulate-keys
+                     (kbd "o / o r g TAB RET")
+                   (read-library-name))))
+  ;; Check that absolute file names also work.
+  (should (equal (expand-file-name "nxml/" data-directory)
+                 (ert-simulate-keys
+                     (concat data-directory (kbd "n x / TAB RET"))
+                   (read-library-name)))))
+
+(provide 'find-func-tests)
+;;; find-func-tests.el ends here