Edge cases on including the size attributes on the image.

lib/gravatar_image_tag.rb

@@ -66,7 +66,7 @@ def gravatar_image_tag(email, options = {})
       gravatar_overrides = options.delete(:gravatar)
       options[:src] = GravatarImageTag::gravatar_url(email, gravatar_overrides)
       options[:alt] ||= 'Gravatar'
-      options[:height] = options[:width] = "#{GravatarImageTag::gravatar_options(gravatar_overrides)[:size]}px" if GravatarImageTag.configuration.include_size_attributes
+      options[:height] = options[:width] = "#{GravatarImageTag::gravatar_options(gravatar_overrides)[:size] || 80}px" if GravatarImageTag.configuration.include_size_attributes
       tag 'img', options, false, false # Patch submitted to rails to allow image_tag here https://rails.lighthouseapp.com/projects/8994/tickets/2878-image_tag-doesnt-allow-escape-false-option-anymore
     end
 

spec/gravatar_image_tag_spec.rb

@@ -76,10 +76,24 @@
   end
 
   it 'should set the image tags height and width to avoid the page going all jiggy (technical term) when loading a page with lots of Gravatars' do
-    (!!view.gravatar_image_tag(email).match(/height="50px"/)).should be_true
-    (!!view.gravatar_image_tag(email).match(/width="50px"/)).should  be_true
+    GravatarImageTag.configure { |c| c.size = 30 }
+    (!!view.gravatar_image_tag(email).match(/height="30px"/)).should be_true
+    (!!view.gravatar_image_tag(email).match(/width="30px"/)).should  be_true
   end
 
+  it 'should set the image tags height and width attributes to 80px (gravatars default) if no size is given.' do
+    GravatarImageTag.configure { |c| c.size = nil }
+    (!!view.gravatar_image_tag(email).match(/height="80px"/)).should be_true
+    (!!view.gravatar_image_tag(email).match(/width="80px"/)).should  be_true
+  end
+
+  it 'should set the image tags height and width attributes from the overrides on the size' do
+    GravatarImageTag.configure { |c| c.size = 120 }
+    (!!view.gravatar_image_tag(email, :gravatar => { :size => 45 }).match(/height="45px"/)).should be_true
+    (!!view.gravatar_image_tag(email, :gravatar => { :size => 75 }).match(/width="75px"/)).should  be_true
+  end
+
+
   it 'should not include the height and width attributes on the image tag if it is turned off in the configuration' do
     GravatarImageTag.configure { |c| c.include_size_attributes = false }
     (!!view.gravatar_image_tag(email).match(/height=/)).should be_false