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-rw-r--r--test/lisp/gnus/mml-sec-tests.el3
1 files changed, 3 insertions, 0 deletions
diff --git a/test/lisp/gnus/mml-sec-tests.el b/test/lisp/gnus/mml-sec-tests.el
index 182d82b9618..f308a617645 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,