--- a/tests/testlib/ext-sidedata.py	Mon Apr 19 11:22:24 2021 +0200
+++ b/tests/testlib/ext-sidedata.py	Mon Apr 19 11:22:24 2021 +0200
@@ -12,7 +12,6 @@
 
 from mercurial.node import nullrev
 from mercurial import (
-    changegroup,
     extensions,
     requirements,
     revlog,
@@ -88,7 +87,7 @@
         )
         dstrepo.register_wanted_sidedata(b"whatever")
 
-    return changegroup.get_sidedata_helpers(srcrepo, dstrepo._wanted_sidedata)
+    return sidedata.get_sidedata_helpers(srcrepo, dstrepo._wanted_sidedata)
 
 
 def extsetup(ui):