Use different image in test_show_image
Use different image in test_show_image

This should cover line 247of `show_image`
``ruby
246    @votes = @image.image_votes.sort_by do |v|
247      (v.anonymous ? :anonymous.l : v.user.unique_text_name).downcase
  ```

MushroomObserver/mushroom-observer,MushroomObserver/mushroom-observer,MushroomObserver/mushroom-observer,MushroomObserver/mushroom-observer,MushroomObserver/mushroom-observer,MushroomObserver/mushroom-observer,MushroomObserver/mushroom-observer