master 84276bf775: Tag an mml-sec test

[Glenn Morris]

branch: master
commit 84276bf775d42388ebc69683d093adef7fc0ed74
Author: Glenn Morris <rgm@gnu.org>
Commit: Glenn Morris <rgm@gnu.org>

    Tag an mml-sec test
    
    * test/lisp/gnus/mml-sec-tests.el (mml-secure-en-decrypt-3):
    Tag unstable on hydra.nixos.org due to repeated intermittent failures.
---
 test/lisp/gnus/mml-sec-tests.el | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/test/lisp/gnus/mml-sec-tests.el b/test/lisp/gnus/mml-sec-tests.el
index 182d82b961..f308a61764 100644
--- a/test/lisp/gnus/mml-sec-tests.el
+++ b/test/lisp/gnus/mml-sec-tests.el
@@ -605,6 +605,9 @@ In this test, the encryption key needs to fixed among 
multiple ones."
 (ert-deftest mml-secure-en-decrypt-3 ()
   "Encrypt message; then decrypt and test for expected result.
 In this test, encrypt-to-self variables are set to t."
+  ;; Random failures with "wrong-type-argument stringp nil".
+  ;; Seems unlikely to be specific to hydra.nixos.org...
+  :tags (if (getenv "EMACS_HYDRA_CI") '(:unstable))
   (skip-unless (test-conf))
   (skip-unless (ignore-errors (epg-find-configuration 'CMS)))
   ;; sub@example.org with multiple candidate keys,