--- a/tests/test-purge.t	Fri May 07 22:06:25 2021 -0400
+++ b/tests/test-purge.t	Mon May 03 20:04:19 2021 +0200
@@ -1,3 +1,11 @@
+#testcases dirstate-v1 dirstate-v1-tree
+
+#if dirstate-v1-tree
+#require rust
+  $ echo '[experimental]' >> $HGRCPATH
+  $ echo 'dirstate-tree.in-memory=1' >> $HGRCPATH
+#endif
+
 init
 
   $ hg init t