class ChefSpec::Renderer

def content_from_template(chef_run, template)
  cookbook_name = template.cookbook || template.cookbook_name
  template_location = cookbook_collection(chef_run.node)[cookbook_name].preferred_filename_on_disk_location(chef_run.node, :templates, template.source)
  if Chef::Mixin::Template.const_defined?(:TemplateContext) # Chef 11+
    template_context = Chef::Mixin::Template::TemplateContext.new([])
    template_context.update({
      node: chef_run.node,
      template_finder: template_finder(chef_run, cookbook_name),
    }.merge(template.variables))
    if template.respond_to?(:helper_modules) # Chef 11.4+
      template_context._extend_modules(template.helper_modules)
    end
    template_context.render_template(template_location)
  else
    template.provider.new(template, chef_run.run_context).send(:render_with_context, template_location) do |file|
      File.read(file.path)
    end
  end
end