bugish.yml

--- 
- !ruby/struct:VCR::HTTPInteraction 
  response: !ruby/struct:VCR::Response 
    body: &id002 !str 
      str: ""
      "@net_http_res": !ruby/object:Net::HTTPOK 
        body: *id002

yaml_test.rb

# We want to use YAML without VCR loaded, to isolate our testing to just YAML.
# However, the yaml files reference some VCR types, so we have to load them.
# Alternately, you can just copy the VCR struct definitions from:
# http://github.com/myronmarston/vcr/blob/v1.0.0/lib/vcr/structs.rb
$LOAD_PATH.unshift('path/to/vcr/lib/dir')
require 'vcr/structs'

times = 1000 # do this many times to expose any intermittent YAML errors
dir = 'path/to/vcr/cassettes'

case ENV['YAML']
  when 'rbyaml'
    require 'rubygems'
    require 'RbYAML'
    def load_yaml(content)
      RbYAML.load(content)
    end
  else
    require 'yaml'
    def load_yaml(content)
      YAML.load(content)
    end    
end

times.times do |i|
  Dir.glob("#{dir}/**/*.yml").each do |file|
    content = File.read(file)

    load_yaml(content)
    puts file    
  end

  puts "\n\n#{i}\n\n"
end