fix: undefined variable

Closes #10

.gitignore

@@ -152,4 +152,5 @@ tags
 
 # IDE
 .idea/
-.c9/
+.c9/
+.vscode/

genrss/__init__.py

@@ -100,7 +100,7 @@ class GenRSS:
         channel_image = self.image
         if not channel_image and self.image_url:
             channel_image = Image(self.image_url, self.site_url, self.title)
-        if isinstance(image, Image):
+        if isinstance(channel_image, Image):
             channel.append(channel_image.to_element())
 
         for category in self.categories:

tests/test_rss.py

@@ -80,10 +80,15 @@ def test_feed_image_url():
     image_url = 'https://s3.smartfridge.me/image.jpg'
     feed = create_rss(image_url=image_url)
     xml = feed.xml()
+
     assert xml
-    assert (f'<image><url>{image_url}</url>'
+    assert (
+        '<image>'
+            f'<url>{image_url}</url>'
+            '<link>https://smartfridge.me/</link>'
             '<title><![CDATA[SmartFridge]]></title>'
-            '<link>https://smartfridge.me/</link></image>') in xml
+        '</image>'
+    ) in xml
 
 
 def test_feed_webmaster():