diff --git a/tests/test-merge-halt.t b/tests/test-merge-halt.t
--- a/tests/test-merge-halt.t
+++ b/tests/test-merge-halt.t
@@ -73,3 +73,75 @@
   $ hg rebase --abort
   rebase aborted
 
+Check that successful tool with failed post-check halts the merge
+  $ echo onfailure=halt >> $HGRCPATH
+  $ cat <<EOS >> $HGRCPATH
+  > [merge-tools]
+  > true.check=changed
+  > EOS
+  $ hg rebase -s 1 -d 2 --tool true
+  rebasing 1:1f28a51c3c9b "c"
+  merging a
+  merging b
+   output file a appears unchanged
+  was merge successful (yn)? n
+  merging a failed!
+  merge halted after failed merge (see hg resolve)
+  [1]
+
+  $ hg resolve --list
+  U a
+  U b
+
+  $ hg rebase --abort
+  rebase aborted
+
+Check conflicts
+  $ cat <<EOS >> $HGRCPATH
+  > [merge-tools]
+  > true.check=conflicts
+  > true.premerge=keep
+  > EOS
+  $ hg rebase -s 1 -d 2 --tool true
+  rebasing 1:1f28a51c3c9b "c"
+  merging a
+  merging b
+  merging a failed!
+  merge halted after failed merge (see hg resolve)
+  [1]
+
+Check conflict prompts
+  $ hg rebase --abort
+  rebase aborted
+  $ hg rebase -s 1 -d 2 --tool true --config merge-tools.true.check=prompt
+  rebasing 1:1f28a51c3c9b "c"
+  merging a
+  merging b
+  was merge of 'a' successful (yn)? n
+  merging a failed!
+  merge halted after failed merge (see hg resolve)
+  [1]
+  $ hg rebase --abort
+  rebase aborted
+
+Check that a requested abort actually works
+  $ cat <<EOS | hg rebase -s 1 -d 2 --tool false --config ui.interactive=1
+  > n
+  > EOS
+  rebasing 1:1f28a51c3c9b "c"
+  merging a
+  merging b
+  merging a failed!
+  merge halted after failed merge (see hg resolve)
+  [1]
+
+  $ hg rebase --abort
+  rebase aborted
+
+Check that successful tool otherwise allows the merge to continue
+  $ hg rebase -s 1 -d 2 --tool echo --keep --config merge-tools.echo.premerge=keep
+  rebasing 1:1f28a51c3c9b "c"
+  merging a
+  merging b
+  $TESTTMP/repo/a *a~base* *a~other* (glob)
+  $TESTTMP/repo/b *b~base* *b~other* (glob)