diff --git a/tests/test-excessive-merge b/tests/test-excessive-merge
new file mode 100755
--- /dev/null
+++ b/tests/test-excessive-merge
@@ -0,0 +1,46 @@
+#!/bin/sh
+
+hg init
+
+echo foo > a
+echo foo > b
+hg add a b
+
+hg ci -m "test" -d "0 0"
+
+echo blah > a
+
+hg ci -m "branch a" -d "0 0"
+
+hg co 0
+
+echo blah > b
+
+hg ci -m "branch b" -d "0 0"
+HGMERGE=true hg up -m 1
+
+hg ci -m "merge b/a -> blah" -d "0 0"
+
+hg co 1
+HGMERGE=true hg up -m 2
+hg ci -m "merge a/b -> blah" -d "0 0"
+
+hg log
+hg debugindex .hg/00changelog.i
+
+echo
+
+echo 1
+hg manifest 1
+echo 2
+hg manifest 2
+echo 3
+hg manifest 3
+echo 4
+hg manifest 4
+
+echo
+
+hg debugindex .hg/data/a.i
+
+hg verify
\ No newline at end of file