it "should not destroy notification for like on comment" do
  comment = FactoryGirl.create(:comment)
  like = FactoryGirl.create_list(:like, 2, likable: comment)
  like.first.destroy
  note = comment.user.notifications.find_by(notifiable: comment, from_comment: false)
  note.should_not be_nil
end

$ rails c test

it "should not destroy notification for like on comment" do
  comment = FactoryGirl.create(:comment)
  like = FactoryGirl.create_list(:like, 2, likable: comment)
debugger
  like.first.destroy
  note = comment.user.notifications.find_by(notifiable: comment, from_comment: false)
  note.should_not be_nil
end