#1866: Support deviantart source rewriting

* html work page -> full image
* thumbnail -> full image

test/unit/downloads/deviant_art_test.rb

@@ -0,0 +1,43 @@
+require 'test_helper'
+
+module Downloads
+  class DeviantArtTest < ActiveSupport::TestCase
+    context "a download for a deviant art html page" do
+      setup do
+        @source = "http://mochikko.deviantart.com/art/RESOLUTION-339610451"
+        @tempfile = Tempfile.new("danbooru-test")
+        @download = Downloads::File.new(@source, @tempfile.path)
+        VCR.use_cassette("download-deviant-art-html", :record => :new_episodes) do
+          @download.download!
+        end
+      end
+
+      should "set the direct image link as the source" do
+        assert_equal("http://fc03.deviantart.net/fs71/f/2012/330/e/7/resolution_by_mochikko-d5m713n.jpg", @download.source)
+      end
+
+      should "work" do
+        assert_equal(255_683, ::File.size(@tempfile.path))
+      end
+    end
+
+    context "a download for a deviant art thumbnail" do
+      setup do
+        @source = "http://fc03.deviantart.net/fs71/200H/f/2012/330/e/7/resolution_by_mochikko-d5m713n.jpg"
+        @tempfile = Tempfile.new("danbooru-test")
+        @download = Downloads::File.new(@source, @tempfile.path)
+        VCR.use_cassette("download-deviant-art-thumb", :record => :new_episodes) do
+          @download.download!
+        end
+      end
+
+      should "instead download the original version" do
+        assert_equal("http://fc03.deviantart.net/fs71/f/2012/330/e/7/resolution_by_mochikko-d5m713n.jpg", @download.source)
+      end
+
+      should "work" do
+        assert_equal(255_683, ::File.size(@tempfile.path))
+      end
+    end
+  end
+end