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#lib/client.rb

require 'faraday_middleware'

module Client
  def connection
    @connection ||= Faraday.new url: APP_URL do |faraday|

=begin
      Some Faraday Builder's code
      ...
=end

      faraday.adapter *Faraday.default_adapter
    end
  end
end

#config/initializers/faraday_stubs.rb
require 'faraday'

stubs = Faraday::Adapter::Test::Stubs.new do |stub|
  stub.get('/resources') {
    [200, { }, { resources: Stubs::Resources }]
  }
end

Faraday.default_adapter = [:test, stubs]