Make Twitter::User#profile_background_image_uri methods return a URI

lib/twitter/user.rb

@@ -34,6 +34,7 @@ class User < Twitter::BasicUser
                           :profile_use_background_image, :suspended, :verified
     define_predicate_method :translator, :is_translator
     define_predicate_method :translation_enabled, :is_translation_enabled
+    uri_attr_reader :profile_background_image_uri, :profile_background_image_uri_https
 
     class << self
     private

spec/twitter/user_spec.rb

@@ -107,6 +107,30 @@
     end
   end
 
+  describe '#profile_background_image_uri' do
+    it 'returns the URI to the user' do
+      user = Twitter::User.new(:id => 7_505_382, :profile_background_image_url => 'http://pbs.twimg.com/profile_background_images/677717672/bb0b3653dcf0644e344823e0a2eb3382.png')
+      expect(user.profile_background_image_uri).to be_an Addressable::URI
+      expect(user.profile_background_image_uri.to_s).to eq('http://pbs.twimg.com/profile_background_images/677717672/bb0b3653dcf0644e344823e0a2eb3382.png')
+    end
+    it 'returns nil when the screen name is not set' do
+      user = Twitter::User.new(:id => 7_505_382)
+      expect(user.profile_background_image_uri).to be_nil
+    end
+  end
+
+  describe '#profile_background_image_uri_https' do
+    it 'returns the URI to the user' do
+      user = Twitter::User.new(:id => 7_505_382, :profile_background_image_url_https => 'https://pbs.twimg.com/profile_background_images/677717672/bb0b3653dcf0644e344823e0a2eb3382.png')
+      expect(user.profile_background_image_uri_https).to be_an Addressable::URI
+      expect(user.profile_background_image_uri_https.to_s).to eq('https://pbs.twimg.com/profile_background_images/677717672/bb0b3653dcf0644e344823e0a2eb3382.png')
+    end
+    it 'returns nil when the screen name is not set' do
+      user = Twitter::User.new(:id => 7_505_382)
+      expect(user.profile_background_image_uri_https).to be_nil
+    end
+  end
+
   describe '#profile_banner_uri' do
     it 'accepts utf8 urls' do
       user = Twitter::User.new(:id => 7_505_382, :profile_banner_url => 'https://si0.twimg.com/profile_banners/7_505_382/1348266581©_normal.png')