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diff --git a/test/lisp/progmodes/project-tests.el b/test/lisp/progmodes/project-tests.el
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+++ b/test/lisp/progmodes/project-tests.el
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+;;; project-tests.el --- tests for project.el -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2021  Free Software Foundation, Inc.
+
+;; 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:
+
+;; Unit tests for progmodes/project.el.
+
+;;; Code:
+
+(require 'project)
+
+(require 'ert)
+
+(ert-deftest project/quoted-directory ()
+  "Check that `project-files' deals with quoted directory
+names (Bug#47799)."
+  (let ((directory (make-temp-file "project-tests-" :directory)))
+    (unwind-protect
+        (let ((project (cons 'transient (file-name-quote directory)))
+              (file (expand-file-name "file" directory)))
+          (make-empty-file file)
+          (should (equal (project-files project)
+                         (list (file-name-quote file)))))
+      (delete-directory directory :recursive))))
+
+;;; project-tests.el ends here