diff --git a/tests/venv/postBuild/postBuild b/tests/venv/postBuild/postBuild
new file mode 100755
index 00000000..28b840f0
--- /dev/null
+++ b/tests/venv/postBuild/postBuild
@@ -0,0 +1,2 @@
+#!/bin/bash
+jupyter nbextension enable --py --sys-prefix ipyleaflet
diff --git a/tests/venv/postBuild/requirements.txt b/tests/venv/postBuild/requirements.txt
new file mode 100644
index 00000000..5a2f5096
--- /dev/null
+++ b/tests/venv/postBuild/requirements.txt
@@ -0,0 +1 @@
+ipyleaflet
diff --git a/tests/venv/postBuild/verify b/tests/venv/postBuild/verify
new file mode 100755
index 00000000..dc618993
--- /dev/null
+++ b/tests/venv/postBuild/verify
@@ -0,0 +1,3 @@
+#!/bin/bash
+set -e
+jupyter nbextension list | grep 'jupyter-leaflet' | grep enabled