--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/testlib/graphviz_setup.sh	Tue Aug 29 16:42:40 2017 +0200
@@ -0,0 +1,17 @@
+. $TESTDIR/testlib/pythonpath.sh
+
+if ! test -z "${GRAPHVIZ_EXTENSION}"; then
+
+cat >> $HGRCPATH << EOF
+[extensions]
+graphviz=${GRAPHVIZ_EXTENSION}/hgext3rd/graphviz.py
+EOF
+
+else
+
+cat >> $HGRCPATH << EOF
+[alias]
+graphviz=log -r "0" -Tt
+EOF
+
+fi