From: Lars Ingebrigtsen <larsi@gnus.org>
Date: Mon, 24 Jan 2022 14:10:18 +0000 (+0100)
Subject: Add derived-mode test for bug#24176
X-Git-Tag: emacs-29.0.90~2790
X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=79d9f3982fe6e558327584099f2efc96e51485a1;p=emacs.git

Add derived-mode test for bug#24176
---

diff --git a/test/lisp/emacs-lisp/derived-tests.el b/test/lisp/emacs-lisp/derived-tests.el
index d867a181832..0589819ccc1 100644
--- a/test/lisp/emacs-lisp/derived-tests.el
+++ b/test/lisp/emacs-lisp/derived-tests.el
@@ -40,4 +40,22 @@
       (derived-tests--child-mode)
       (should (equal (buffer-string) "PB CB MH AFP=S AFC=S ")))))
 
+(ert-deftest test-add-font-lock ()
+  (define-derived-mode mode-a fundamental-mode "mode-a"
+    (font-lock-add-keywords nil `(("a" 0 'font-lock-keyword-face))))
+  (define-derived-mode mode-b mode-a "mode-b"
+    (font-lock-add-keywords nil `(("b" 0 'font-lock-builtin-face))))
+  (define-derived-mode mode-c mode-b "mode-c"
+    (font-lock-add-keywords nil `(("c" 0 'font-lock-constant-face))))
+
+  (with-temp-buffer
+    (mode-c)
+    (should (equal font-lock-keywords
+                   '(t (("c" 0 'font-lock-constant-face)
+                        ("b" 0 'font-lock-builtin-face)
+                        ("a" 0 'font-lock-keyword-face))
+                       ("c" (0 'font-lock-constant-face))
+                       ("b" (0 'font-lock-builtin-face))
+                       ("a" (0 'font-lock-keyword-face)))))))
+
 ;;; derived-tests.el ends here