fix: classic template did not pass base_url to macro

Fixes #734

share/jupyter/voila/templates/classic/index.html.j2

@@ -43,6 +43,6 @@
 {% endblock body_header %}
 
 {% block footer_js %}
-{{ voila_setup() }}
+{{ voila_setup(resources.base_url, resources.nbextensions) }}
 {% endblock footer_js %}
 

tests/app/template_sanity_test.py

@@ -0,0 +1,19 @@
+# tests basic things the templates should have
+import pytest
+
+import os
+
+BASE_DIR = os.path.dirname(__file__)
+
+
+@pytest.fixture(params=['lab', 'classic'])
+def voila_args_extra(request):
+    return [f'--template={request.param}']
+
+
+async def test_lists_extension(http_server_client, base_url, voila_app):
+    response = await http_server_client.fetch(base_url)
+    assert response.code == 200
+    html_text = response.body.decode('utf-8')
+    assert f'/voila/templates/{voila_app.voila_configuration.template}/static/voila.js' in html_text
+    assert '/voila/static/require.min.js' in html_text