Add tests for Gist & Tweet plugins

test/unit/plugins.js

@@ -117,5 +117,22 @@ describe('filter', function() {
             plugins);
         }));
 
+        it('should recognize gists', inject(function(plugins) {
+            expectTheseMessagesToContain([
+                'https://gist.github.com/lorenzhs/e8c1a7d56fa170320eb8',
+                'https://gist.github.com/e8c1a7d56fa170320eb8',
+            ],
+            'Gist',
+            plugins);
+        }));
+
+        it('should recognize tweets', inject(function(plugins) {
+            expectTheseMessagesToContain([
+                'https://twitter.com/DFB_Team_EN/statuses/488436782959448065',
+            ],
+            'Tweet',
+            plugins);
+        }));
+
     });
 });