adds setting allow_images to specs

spec/shared/features/nested_imageable.rb

@@ -9,6 +9,9 @@ shared_examples "nested imageable" do |imageable_factory_name, path, imageable_p
   let!(:imageable)           { create(imageable_factory_name) }
 
   before do
+
+    Setting['feature.allow_images'] = true
+
     imageable_path_arguments&.each do |argument_name, path_to_value|
         arguments.merge!("#{argument_name}": imageable.send(path_to_value))
     end
@@ -16,6 +19,10 @@ shared_examples "nested imageable" do |imageable_factory_name, path, imageable_p
     imageable.update(author: user) if imageable.respond_to?(:author)
   end
 
+  after do
+    Setting['feature.allow_images'] = nil
+  end
+
   describe "at #{path}" do
 
     scenario "Should show new image link when imageable has not an associated image defined" do