rspec - 加速 Chefspec 运行

Question

我有很多食谱，它们都经过了ChefSpec的严格测试。我有 800 多个规范，每次在提交代码之前运行它们已经成为一个问题，因为在我的机器上运行它们大约需要 20 分钟。这使得每个规范约 0.(6) 秒，虽然不多，但加起来会花费很长时间。

是否有可能并行运行 ChefSpec/RSpec 测试或以其他方式提高速度？

Answer 1

Update 4 Jan 2014: The following idea is now implemented inside ChefSpec (>= 3.1.2). See Faster Specs part in Readme.

================================

This is a excerpt from an blogpost that covers this topic with some more details.

RSpec allows to extend modules with your own methods and the idea is to write method similar to let, but which will cache the results across examples too. Create a *spec_helper.rb* file somewhere in your Chef project and add the following lines there:

module SpecHelper
  @@cache = {}
  def shared( name, &block )
    location = ancestors.first.metadata[:example_group][:location]
    define_method( name ) do
      @@cache[location + name.to_s] ||= instance_eval( &block )
    end
  end

  def shared!( name, &block )
    shared name, &block
    before { __send__ name }
  end
end

RSpec.configure do |config|
  config.extend SpecHelper
end

Values from @@cache are never deleted, and you can use same names with this block, so I also use location of the usage, which looks like that: "./cookbooks/my_cookbook/spec/default_spec.rb:3". Now change let( :chef_run ) into shared( :chef_run ) in your specs:

describe "example::default" do
  shared( :chef_run ) { ChefSpec::ChefRunner.new.converge described_recipe }
  [...]
end

And when running the tests you will now have to include the spec_helper.rb too:

rspec --include ./relative/path/spec_helper.rb cookbooks/*/spec/*_spec.rb