cassette_library_dir

The cassette_library_dir configuration option sets a directory where VCR saves each cassette.

Note: When using Rails, avoid using the test/fixtures directory to store the cassettes. Rails treats any YAML file in the fixtures directory as an ActiveRecord fixture. This will cause an ActiveRecord::Fixture::FormatError to be raised.

cassette_library_dir

Given a file named "cassette_library_dir.rb" with:

$server = start_sinatra_app do
  get('/') { "Hello" }
end

require 'vcr'

VCR.configure do |c|
  c.cassette_library_dir = 'vcr/cassettes'
  c.hook_into :webmock
end

VCR.use_cassette('localhost') do
  Net::HTTP.get_response('localhost', '/', $server.port)
end

And the directory "vcr/cassettes" does not exist

When I run ruby cassette_library_dir.rb

Then the file "vcr/cassettes/localhost.yml" should exist.