--- a/tests/test-evolve-orphan-merge.t	Wed Mar 11 16:11:04 2020 +0700
+++ b/tests/test-evolve-orphan-merge.t	Thu Mar 12 06:18:44 2020 +0100
@@ -1,5 +1,6 @@
 ** Testing resolution of orphans by `hg evolve` when merges are involved **
 
+  $ . $TESTDIR/testlib/common.sh
   $ cat >> $HGRCPATH <<EOF
   > [ui]
   > interactive = True
@@ -585,3 +586,91 @@
   |   () draft
   o  0:8fa14d15e168 added hgignore
       () draft
+
+  $ cd ..
+  $ hg init pruned_merge_pruned_left
+  $ cd pruned_merge_pruned_left
+
+  $ mkcommit base
+  $ mkcommit a
+  $ hg up 0 -q
+  $ mkcommit b
+  created new head
+  $ hg up 1 -q
+  $ hg merge 2 -q
+  $ hg ci -m merge
+  $ mkcommit c
+
+  $ hg prune 3
+  1 changesets pruned
+  1 new orphan changesets
+  $ hg prune 2
+  1 changesets pruned
+
+  $ hg glog
+  @  4:a3a0811688b4 c
+  |   () draft
+  x    3:1ed5adcc2e8b merge
+  |\    () draft
+  | x  2:87fc619cd5f8 b
+  | |   () draft
+  o |  1:c604726e05fb a
+  |/    () draft
+  o  0:d20a80d4def3 base
+      () draft
+  $ hg evolve -r 4
+  move:[4] c
+  atop:[1] a
+  working directory is now at f8447023939d
+
+  $ hg glog
+  @  5:f8447023939d c
+  |   () draft
+  o  1:c604726e05fb a
+  |   () draft
+  o  0:d20a80d4def3 base
+      () draft
+
+  $ cd ..
+  $ hg init pruned_merge_pruned_right
+  $ cd pruned_merge_pruned_right
+
+  $ mkcommit base
+  $ mkcommit a
+  $ hg up 0 -q
+  $ mkcommit b
+  created new head
+  $ hg up 1 -q
+  $ hg merge 2 -q
+  $ hg ci -m merge
+  $ mkcommit c
+
+  $ hg prune 3
+  1 changesets pruned
+  1 new orphan changesets
+  $ hg prune 1
+  1 changesets pruned
+
+  $ hg glog
+  @  4:a3a0811688b4 c
+  |   () draft
+  x    3:1ed5adcc2e8b merge
+  |\    () draft
+  | o  2:87fc619cd5f8 b
+  | |   () draft
+  x |  1:c604726e05fb a
+  |/    () draft
+  o  0:d20a80d4def3 base
+      () draft
+  $ hg evolve -r 4
+  move:[4] c
+  atop:[2] b
+  working directory is now at fb87828da800
+
+  $ hg glog
+  @  5:fb87828da800 c
+  |   () draft
+  o  2:87fc619cd5f8 b
+  |   () draft
+  o  0:d20a80d4def3 base
+      () draft