return the proper atom and rss content types for the feeds

Signed-off-by: Brian S. Stephan <bss@incorporeal.org>

tests/test_feed.py

@@ -16,6 +16,7 @@ def test_atom_type_is_200(client):
     """Test that requesting an ATOM feed is found."""
     response = client.get('/feed/atom')
     assert response.status_code == 200
+    assert 'application/atom+xml' in response.content_type
     print(response.text)
 
 
@@ -23,6 +24,7 @@ def test_rss_type_is_200(client):
     """Test that requesting an RSS feed is found."""
     response = client.get('/feed/rss')
     assert response.status_code == 200
+    assert 'application/rss+xml' in response.content_type
     print(response.text)
 
 
@@ -30,13 +32,13 @@ def test_feed_generator_atom(app):
     """Test the root feed generator."""
     with app.test_request_context():
         content = serve_feed('atom')
-    assert b'<id>https://example.com/</id>' in content
-    assert b'<email>admin@example.com</email>' in content
-    assert b'<name>Test Name</name>' in content
+    assert b'<id>https://example.com/</id>' in content.data
+    assert b'<email>admin@example.com</email>' in content.data
+    assert b'<name>Test Name</name>' in content.data
 
 
 def test_feed_generator_rss(app):
     """Test the root feed generator."""
     with app.test_request_context():
         content = serve_feed('rss')
-    assert b'<author>admin@example.com (Test Name)</author>' in content
+    assert b'<author>admin@example.com (Test Name)</author>' in content.data