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require 'rails'

module EnvHelpers
  private

  def with_rails_env(env)
    Rails.instance_variable_set :@_env, nil
    switch_env 'RAILS_ENV', env do
      switch_env 'RACK_ENV', nil do
        yield
      end
    end
  end

  def switch_env(key, value)
    old, ENV[key] = ENV[key], value
    yield
  ensure
    ENV[key] = old
  end
end