twitter: test fetching source data from direct image with referer.

test/unit/sources/twitter_test.rb

@@ -123,6 +123,21 @@ module Sources
       end
     end
 
+    context "The source site for a direct image and a referer" do
+      setup do
+        @site = Sources::Site.new("https://pbs.twimg.com/media/B4HSEP5CUAA4xyu.png:large", referer_url: "https://twitter.com/nounproject/status/540944400767922176")
+        @site.get
+      end
+
+      should "get the artist name" do
+        assert_equal("Noun Project", @site.artist_name)
+      end
+
+      should "get the image url" do
+        assert_equal("https://pbs.twimg.com/media/B4HSEP5CUAA4xyu.png:orig", @site.image_url)
+      end
+    end
+
     context "A tweet" do
       setup do
         @site = Sources::Site.new("https://twitter.com/noizave/status/875768175136317440")