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diff --git a/test/lisp/emacs-lisp/macroexp-tests.el b/test/lisp/emacs-lisp/macroexp-tests.el
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+;;; macroexp-tests.el --- Tests for macroexp.el      -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2021  Free Software Foundation, Inc.
+
+;; Author: Stefan Monnier <monnier@iro.umontreal.ca>
+;; Keywords:
+
+;; This program 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.
+
+;; This program 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 this program.  If not, see <https://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;;
+
+;;; Code:
+
+(ert-deftest macroexp--tests-fgrep ()
+  (should (equal (macroexp--fgrep '((x) (y)) '([x] z ((u))))
+                 '((x))))
+  (should (equal (macroexp--fgrep '((x) (y)) '#2=([y] ((y #2#))))
+                 '((y))))
+  (should (equal (macroexp--fgrep '((x) (y)) '#2=([r] ((a x)) a b c d . #2#))
+                 '((x)))))
+
+(defconst macroexp--tests-filename (macroexp-file-name))
+
+(defmacro macroexp--test-get-file-name () (macroexp-file-name))
+
+(ert-deftest macroexp--tests-file-name ()
+  (should (string-match
+           "\\`macroexp-tests.elc?\\'"
+           (file-name-nondirectory macroexp--tests-filename)))
+  (let ((rsrc-dir (expand-file-name
+                   "macroexp-resources"
+                   (file-name-directory macroexp--tests-filename))))
+    (with-current-buffer
+        (find-file-noselect (expand-file-name "m1.el" rsrc-dir))
+      (defvar macroexp--m1-tests-filename)
+      (declare-function macroexp--m1-tests-file-name "m1" ())
+      ;; `macroexp-file-name' should work with `eval-buffer'.
+      (eval-buffer)
+      (should (equal "m1.el"
+                     (file-name-nondirectory macroexp--m1-tests-filename)))
+      (should (equal "m1.el"
+                     (file-name-nondirectory (macroexp--m1-tests-file-name))))
+      (search-forward "macroexp--m1-tests-filename")
+      (makunbound 'macroexp--m1-tests-filename)
+      ;; `macroexp-file-name' should also work with `eval-defun'.
+      (eval-defun nil)
+      (should (equal "m1.el"
+                     (file-name-nondirectory macroexp--m1-tests-filename))))
+
+    ;; Test the case where we load a file which byte-compiles another.
+    (defvar macroexp--m1-tests-comp-filename)
+    (makunbound 'macroexp--m1-tests-comp-filename)
+    (load (expand-file-name "m2.el" rsrc-dir))
+    (should (equal "m1.el"
+                   (file-name-nondirectory macroexp--m1-tests-comp-filename)))))
+
+
+(provide 'macroexp-tests)
+;;; macroexp-tests.el ends here