Add test for site downloader gallery

bulkredditdownloader/tests/downloaders/test_gallery.py

@@ -0,0 +1,22 @@
+#!/usr/bin/env python3
+# coding=utf-8
+
+import praw
+import praw.models
+import pytest
+
+from bulkredditdownloader.resource import Resource
+from bulkredditdownloader.site_downloaders.gallery import Gallery
+
+
+@pytest.fixture()
+def reddit_submission() -> praw.models.Submission:
+    rd = praw.Reddit(client_id='U-6gk4ZCh3IeNQ', client_secret='7CZHY6AmKweZME5s50SfDGylaPg', user_agent='test')
+    return rd.submission(id='ljyy27')
+
+
+def test_gallery(reddit_submission: praw.models.Submission):
+    gallery = Gallery(reddit_submission)
+    results = gallery.download()
+    assert len(results) == 4
+    assert all([isinstance(result, Resource) for result in results])