--- a/tests/test-evolve.t	Wed Apr 24 16:35:01 2019 +0800
+++ b/tests/test-evolve.t	Wed Apr 24 17:02:27 2019 +0800
@@ -924,7 +924,7 @@
   1 files updated, 0 files merged, 0 files removed, 0 files unresolved
   $ hg amend -m 'a1_'
   2 new orphan changesets
-  $ hg evolve
+  $ hg evolve --rev 'first(orphan())'
   move:[4] a2
   atop:[6] a1_
   $ hg evolve
@@ -972,7 +972,7 @@
   $ ls .hg/bookmarks*
   .hg/bookmarks
   .hg/bookmarks.* (glob)
-  $ hg evolve
+  $ hg evolve --rev 'first(orphan())'
   move:[7] a2
   atop:[9] a1__
   (leaving bookmark testbookmark)