add test for default-push.
new file mode 100755
--- /dev/null
+++ b/tests/test-default-push
@@ -0,0 +1,18 @@
+#!/bin/sh
+
+hg init a
+echo a > a/a
+hg --cwd a ci -Ama
+
+hg clone a c
+
+hg clone a b
+echo b >> b/a
+hg --cwd b ci -mb
+
+echo % push should push to default when default-push not set
+hg --cwd b push | sed 's/pushing to.*/pushing/'
+
+echo % push should push to default-push when set
+echo 'default-push = ../c' >> b/.hg/hgrc
+hg --cwd b push | sed 's/pushing to.*/pushing/'
new file mode 100644
--- /dev/null
+++ b/tests/test-default-push.out
@@ -0,0 +1,17 @@
+adding a
+1 files updated, 0 files merged, 0 files removed, 0 files unresolved
+1 files updated, 0 files merged, 0 files removed, 0 files unresolved
+% push should push to default when default-push not set
+pushing
+searching for changes
+adding changesets
+adding manifests
+adding file changes
+added 1 changesets with 1 changes to 1 files
+% push should push to default-push when set
+pushing
+searching for changes
+adding changesets
+adding manifests
+adding file changes
+added 1 changesets with 1 changes to 1 files