This patch fixing a build failure has been cherry-picked from upstream.
Originally submitted as pull request by Erik Šabič.
See also <https://github.com/Wilfred/helpful/pull/296>.
diff --git a/test/helpful-unit-test.el b/test/helpful-unit-test.el
index a07aa8e..8a95129 100644
--- a/test/helpful-unit-test.el
+++ b/test/helpful-unit-test.el
@@ -119,7 +119,9 @@ bar")))
   (should
    (equal
     (helpful--docstring #'test-foo-advised t)
-    "Docstring here too.")))
+    (if (version< emacs-version "28")
+        "Docstring here too."
+    "Docstring here too.\n\nThis function has :around advice: `ad-Advice-test-foo-advised'."))))
 
 (defun test-foo-no-docstring ()
   nil)
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<tr><td><span title='2021-10-25 21:01:21 +0200'>2021-10-25</span></td><td><a href='/guix/commit/gnu/packages/patches/flatpak-fix-path.patch?id=9c4244cc73db4d5c3adf6f8342f6b08b39dd3628'>gnu: flatpak: Add patch to fix paths.</a><span class='msg-avail'>...</span></td><td>John Kehayias</td></tr>