```ruby
# frozen_string_literal: true

RSpec.describe "double checking sources", :realworld => true do
  it "finds already-installed gems" do
    create_file("rails.gemspec", <<-RUBY)
      Gem::Specification.new do |s|
        s.name        = "rails"
        s.version     = "5.1.4"
        s.summary     = ""
        s.description = ""
        s.author      = ""
        s.add_dependency "actionpack", "5.1.4"
      end
    RUBY

    create_file("actionpack.gemspec", <<-RUBY)
      Gem::Specification.new do |s|
        s.name        = "actionpack"
        s.version     = "5.1.4"
        s.summary     = ""
        s.description = ""
        s.author      = ""
        s.add_dependency "rack", "~> 2.0.0"
      end
    RUBY

    cmd = <<-RUBY
      require "bundler"
      require #{File.expand_path("../../support/artifice/vcr.rb", __FILE__).dump}
      require "bundler/inline"
      gemfile(true) do
        source "https://rubygems.org"
        gem "rails", path: "."
      end
    RUBY

    ruby! cmd
    ruby! cmd
  end
end
```

Enable retries on flaky spec
user
```ruby
# frozen_string_literal: true

RSpec.describe "double checking sources", :realworld => true, :sometimes => true do
  it "finds already-installed gems" do
    create_file("rails.gemspec", <<-RUBY)
      Gem::Specification.new do |s|
        s.name        = "rails"
        s.version     = "5.1.4"
        s.summary     = ""
        s.description = ""
        s.author      = ""
        s.add_dependency "actionpack", "5.1.4"
      end
    RUBY

    create_file("actionpack.gemspec", <<-RUBY)
      Gem::Specification.new do |s|
        s.name        = "actionpack"
        s.version     = "5.1.4"
        s.summary     = ""
        s.description = ""
        s.author      = ""
        s.add_dependency "rack", "~> 2.0.0"
      end
    RUBY

    cmd = <<-RUBY
      require "bundler"
      require #{File.expand_path("../../support/artifice/vcr.rb", __FILE__).dump}
      require "bundler/inline"
      gemfile(true) do
        source "https://rubygems.org"
        gem "rails", path: "."
      end
    RUBY

    ruby! cmd
    ruby! cmd
  end
end
```
assistant