add test for custom contents

test/test_content/customzipped.control

@@ -0,0 +1 @@
+- "{'customzippedname:': ''}"

test/test_content/customzipped.source

@@ -0,0 +1,4 @@
+- addsongdir:
+    path: "datadir_sort"
+    content:
+        - customzippedname:

test/test_content/datadir/python/content/customzipedplugin.py

@@ -0,0 +1,15 @@
+"""Fake plugin for test purposes."""
+
+from patacrep.content import ContentItem, ContentList, validate_parser_argument
+
+class FakeContent(ContentItem):
+    """Fake content."""
+
+    def file_entry(self):
+        return {'customzippedname:':''}
+
+def parse(keyword, argument, config):
+    return ContentList([FakeContent()])
+
+CONTENT_PLUGINS = {'customzipedname': parse}
+

test/test_content/test_content.py

@@ -101,7 +101,7 @@ class FileTest(unittest.TestCase, metaclass=dynamic.DynamicTest):
 
         # Load the default songbook config
         config = prepare_songbook(
-            {'book':{'datadir':'datadir'}, 'content': sbcontent},
+            {'book':{'datadir':['datadir', 'datadir_zippedcontent']}, 'content': sbcontent},
             outputdir,
             base,
             outputdir