diff --git a/Makefile b/Makefile
--- a/Makefile
+++ b/Makefile
@@ -134,6 +134,7 @@
 	cd $(HGROOT)/rust/hg-cpython \
 		&& $(CARGO) test --quiet --all \
 			--no-default-features --features "$(py_feature)"
+	cd $(HGROOT)/rust/rhg && $(CARGO) test --quiet
 
 check-code:
 	hg manifest | xargs python contrib/check-code.py