new file mode 100755
--- /dev/null
+++ b/tests/test-demandimport
@@ -0,0 +1,47 @@
+#!/usr/bin/env python
+
+from mercurial import demandimport
+demandimport.enable()
+
+import re
+
+rsub = re.sub
+def f(obj):
+    l = repr(obj)
+    l = rsub("0x[0-9a-f]+", "0x?", l)
+    l = rsub("from '.*'", "from '?'", l)
+    return l
+
+import os
+
+print "os =", f(os)
+print "os.system =", f(os.system)
+print "os =", f(os)
+
+import mercurial.version
+
+print "mercurial.version =", f(mercurial.version)
+print "mercurial.version.get_version =", f(mercurial.version.get_version)
+print "mercurial.version =", f(mercurial.version)
+print "mercurial =", f(mercurial)
+
+from mercurial import util
+
+print "util =", f(util)
+print "util.system =", f(util.system)
+print "util =", f(util)
+print "util.system =", f(util.system)
+
+import re as fred
+print "fred =", f(fred)
+
+import sys as re
+print "re =", f(re)
+
+print "fred =", f(fred)
+print "fred.sub =", f(fred.sub)
+print "fred =", f(fred)
+
+print "re =", f(re)
+print "re.stdout =", f(re.stdout)
+print "re =", f(re)