--- a/tests/test-merge4.t	Fri Jan 10 17:46:10 2020 -0800
+++ b/tests/test-merge4.t	Wed Jan 29 11:30:35 2020 -0800
@@ -23,3 +23,37 @@
   abort: cannot commit merge with missing files
   [255]
 
+
+Test conflict*() revsets
+
+# Bad usage
+  $ hg log -r 'conflictlocal(foo)'
+  hg: parse error: conflictlocal takes no arguments
+  [255]
+  $ hg log -r 'conflictother(foo)'
+  hg: parse error: conflictother takes no arguments
+  [255]
+  $ hg co -C .
+  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
+# No merge parents when not merging
+  $ hg log -r 'conflictlocal() + conflictother()'
+# No merge parents when there is no conflict
+  $ hg merge 1
+  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
+  (branch merge, don't forget to commit)
+  $ hg log -r 'conflictlocal() + conflictother()'
+  $ hg co -C .
+  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
+  $ echo conflict > b
+  $ hg ci -Aqm 'conflicting change to b'
+  $ hg merge 1
+  merging b
+  warning: conflicts while merging b! (edit, then use 'hg resolve --mark')
+  0 files updated, 0 files merged, 0 files removed, 1 files unresolved
+  use 'hg resolve' to retry unresolved file merges or 'hg merge --abort' to abandon
+  [1]
+# Shows merge parents when there is a conflict
+  $ hg log -r 'conflictlocal()' -T '{rev} {desc}\n'
+  3 conflicting change to b
+  $ hg log -r 'conflictother()' -T '{rev} {desc}\n'
+  1 commit #1