source 'https://rubygems.org'

gemfile_url = File.join(File.dirname(__FILE__), 'spec/dummy/Gemfile')
gemfile_content = File.open(gemfile_url, "rb")  { |f| f.read }
eval_gemfile gemfile_url, gemfile_content.gsub(/(gem 'dune-api'.+)/, '').gsub(/(gem 'rspec-rails'.+)/, '')

gemspec