How to mock network i/o for command line scripts

### Save this as mock_network:
require "webmock"
require "vcr"

VCR.configure do |config|
  config.cassette_library_dir = Pathname(__dir__) + "vcr"
  config.hook_into :webmock
end

VCR.insert_cassette('network', :record => ENV["RECORD"] ? :new_episodes : :none)

END {
  VCR.eject_cassette
}

### Then do this in tests

system "ruby -r#{__dir__}/mock_network your_script arguments"

and `RECORD=1 rspec` first time or `rspec` later.