Dynamically creates the file structure and file naming for VCR cassettes with MiniTest::Spec

vcr_dynamic.rb

# Put this in your test helper

class MiniTest::Spec
  before :each do |example|
    if metadata[:vcr]
      test_info = example.class.name.split("::").map {|e| e.underscore}.reject(&:empty?)
      name = spec_name.underscore.gsub(/[^\w\/]+/, "_")
      path = "test/cassettes/" + [(test_info[0] + "_test"), test_info[1]].join("/")
      FileUtils.mkdir_p(path) unless File.exists?(path)
      VCR.configure do |c|
        c.cassette_library_dir = path
      end
      VCR.insert_cassette name
    end
  end

  after :each do
    if metadata[:vcr]
      VCR.eject_cassette
      VCR.configure do |c|
        c.cassette_library_dir = 'test/cassettes'
      end
    end
  end
  
  # And in you gemfile
  # gem "minispec-metadata"
  
  # Example: 
  
  describe Foo, vcr: true do
    describe "#random_method" do
      describe "with some other info" do
      before do
        # Do some setup
      end

      it "should be all awesome" do
        # Make assertations
      end
    end
  end
  
  # This will create
    # test -
      # cassettes -
        # foo_test -
          # #random_method -
            # should_be_all_awesome.yml

Very nice.