add spec for raw_email action

spec/controllers/posts_controller_spec.rb

@@ -68,6 +68,36 @@ describe PostsController do
     end
   end
 
+  describe 'raw_email' do
+    include_examples "action requires login", :get, :raw_email, id: 2
+
+    describe "when logged in" do
+      let(:user) {log_in}
+      let(:post) {Fabricate(:post, user: user, raw_email: 'email_content')}
+
+      it "raises an error if the user doesn't have permission to view raw email" do
+        Guardian.any_instance.expects(:can_view_raw_email?).returns(false)
+
+        xhr :get, :raw_email, id: post.id
+
+        response.should be_forbidden
+      end
+
+      it "can view raw email" do
+        Guardian.any_instance.expects(:can_view_raw_email?).returns(true)
+
+        xhr :get, :raw_email, id: post.id
+
+        response.should be_success
+        json = ::JSON.parse(response.body)
+        json.should be_present
+        json['raw_email'].should == 'email_content'
+      end
+
+    end
+
+  end
+
   describe 'show' do
     include_examples 'finding and showing post' do
       let(:action) { :show }