Prevent a todo-mode test from running with 'make check'

* test/lisp/calendar/todo-mode-tests.el
(todo-test-add-and-delete-file): Tag this test as unstable, since
it has been reported to fail unreproducibly (bug#58473) or
reproducibly only on the ZFS filesystem (bug#76381) and the causes
are still unknown.

1 files changed, 4 insertions, 0 deletions

diff --git a/test/lisp/calendar/todo-mode-tests.el b/test/lisp/calendar/todo-mode-tests.el
index 0d10cc60547..157a4c3168c 100644
--- a/test/lisp/calendar/todo-mode-tests.el
+++ b/test/lisp/calendar/todo-mode-tests.el
@@ -825,6 +825,10 @@ automatic testing."
 Calling todo-show should display the last current todo file, not
 necessarily the new file.  After deleting the new file, todo-show
 should display the previously current (or default) todo file."
+  ;; This test has been reported to fail unreproducibly (bug#58473) or
+  ;; reproducibly only on the ZFS filesystem (bug#76381).  Since the
+  ;; causes are still unknown, don't run it with 'make check'.
+  :tags '(:unstable)
   (with-todo-test
    (todo-show)
    (should (equal todo-current-todo-file todo-test-file-1))