FIX: Allow expanding posts when anonymous, add specs

spec/controllers/posts_controller_spec.rb

@@ -490,4 +490,21 @@ describe PostsController do
 
   end
 
+  describe 'expandable embedded posts' do
+    let(:post) { Fabricate(:post) }
+
+    it "raises an error when you can't see the post" do
+      Guardian.any_instance.expects(:can_see?).with(post).returns(false)
+      xhr :get, :expand_embed, id: post.id
+      response.should_not be_success
+    end
+
+    it "retrieves the body when you can see the post" do
+      Guardian.any_instance.expects(:can_see?).with(post).returns(true)
+      TopicEmbed.expects(:expanded_for).with(post).returns("full content")
+      xhr :get, :expand_embed, id: post.id
+      response.should be_success
+      ::JSON.parse(response.body)['cooked'].should == "full content"
+    end
+  end
 end