use separate template for testing preprocessor

tests/app/preprocessor_test.py

@@ -10,7 +10,7 @@ def voila_notebook(notebook_directory):
 
 @pytest.fixture
 def voila_args_extra():
-    return ['--template=test_template']
+    return ['--template=skip_template']
 
 
 async def test_markdown_preprocessor(http_server_client, base_url):

tests/skip_template/setup.py

@@ -0,0 +1,19 @@
+import os
+from setuptools import setup
+
+
+data_files = []
+for (dirpath, dirnames, filenames) in os.walk('share/jupyter/voila/templates'):
+    if filenames:
+        data_files.append((dirpath, [os.path.join(dirpath, filename) for filename in filenames]))
+
+
+setup(
+    name='voila_skip_template',
+    version="0.0.1",
+    description="Test template for Voilà",
+    data_files=data_files,
+    include_package_data=True,
+    author='Voilà Development team',
+    author_email='jupyter@googlegroups.com'
+)

tests/skip_template/share/jupyter/voila/templates/skip_template/conf.json

@@ -0,0 +1,10 @@
+{
+  "base_template": "classic",
+  "preprocessors": {
+    "100-remove-skip-voila-cells": {
+        "type": "nbconvert.preprocessors.tagremove.TagRemovePreprocessor",
+        "remove_cell_tags": ["skip-voila"],
+        "enabled": true
+    }
+  }
+}

tests/test_template/share/jupyter/voila/templates/test_template/conf.json

@@ -6,12 +6,5 @@
         "test_resource": "test resource from config file"
       }
     }
-  },
-  "preprocessors": {
-    "100-remove-skip-voila-cells": {
-        "type": "nbconvert.preprocessors.tagremove.TagRemovePreprocessor",
-        "remove_cell_tags": ["skip-voila"],
-        "enabled": true
-    }
   }
 }

tests/test_template/share/jupyter/voila/templates/test_template/index.html.j2

@@ -1,5 +1,3 @@
-{%- extends 'classic/index.html.j2' -%}
-
 Hi Voilà!
 This is a test template, obviously