--- a/tests/test-check-format.t	Sun Aug 02 17:40:35 2020 +0200
+++ b/tests/test-check-format.t	Thu Aug 27 09:06:35 2020 +0200
@@ -1,4 +1,4 @@
-#require black
+#require black test-repo
 
   $ cd $RUNTESTDIR/..
   $ black --config=black.toml --check --diff `hg files 'set:(**.py + grep("^#!.*python")) - mercurial/thirdparty/**'`