diff --git a/tests/test-extension b/tests/test-extension
--- a/tests/test-extension
+++ b/tests/test-extension
@@ -7,9 +7,12 @@ from mercurial import commands
 
 def uisetup(ui):
     ui.write("uisetup called\\n")
+    ui.write("ui.parentui is%s None\\n" % (ui.parentui is not None
+                                           and "not" or ""))
 
 def reposetup(ui, repo):
     ui.write("reposetup called for %s\\n" % os.path.basename(repo.root))
+    ui.write("ui %s= repo.ui\\n" % (ui == repo.ui and "=" or "!"))
 
 def foo(ui, *args, **kwargs):
     ui.write("Foo\\n")