Recursive file system stubs for fakefs

fixture_helpers.rb

require 'fileutils'
require 'yaml'

module Tower
  module FixtureHelpers
    def self.fixture(fixture_name)
      fixtures[fixture_name] || fixture_not_found!(fixture_name)
    end

    def self.fixture_not_found!(fixture_name)
      raise "No fixture #{fixture_name.inspect} in #{fixtures.keys.inspect}"
    end

    def self.fixtures
      @fixtures ||= {}
    end

    def self.preload_fixtures
      fixtures_path = File.join(File.dirname(__FILE__), '..', 'fixtures', '*.yml')
      Dir.glob(fixtures_path).each do |fixture_path|
        fixture_key = File.basename(fixture_path).slice(/\A(.*)\./, 1).to_sym
        fixtures[fixture_key] = YAML.load_file(fixture_path)
      end
    end

    def stub_file_structure_from_fixture(fixture_name)
      FixtureHelpers.fixture(fixture_name).tap do |nodes|
        stub_tree '/', nodes
      end
    end

    private

    def create_file(path)
      FileUtils.mkpath File.dirname(path)
      FileUtils.touch path
    end

    def stub_tree(prefix, nodes)
      nodes.each do |node|
        if node.is_a?(String)
          create_file File.join(prefix, node)
        elsif node.is_a?(Hash)
          node.each do |directory, contents|
            stub_tree File.join(prefix, directory), contents
          end
        else
          raise "#{node.class.name} is not an accepted fixture node type: #{node.inspect}"
        end
      end
    end
  end
end