Project: Vcr 1.7.0

Publisher: VCR

:once

The :once record mode will:

Replay previously recorded interactions.
Record new interactions if there is no cassette file.
Cause an error to be raised for new requests if there is a cassette file.

It is similar to the :new_episodes record mode, but will prevent new,
unexpected requests from being made (i.e. because the request URI changed
or whatever).

:once is the default record mode, used when you do not set one.

Background

Given

a file named "setup.rb" with:

require 'vcr_cucumber_helpers'

start_sinatra_app(:port => 7777) do
  get('/') { 'Hello' }
end

require 'vcr'

VCR.config do |c|
  c.stub_with                :fakeweb
  c.cassette_library_dir     = 'cassettes'
end

And

a previously recorded cassette file "cassettes/example.yml" with:

--- 
- !ruby/struct:VCR::HTTPInteraction 
  request: !ruby/struct:VCR::Request 
    method: :get
    uri: http://example.com:80/foo
    body: 
    headers: 
  response: !ruby/struct:VCR::Response 
    status: !ruby/struct:VCR::ResponseStatus 
      code: 200
      message: OK
    headers: 
      content-type: 
      - text/html;charset=utf-8
      content-length: 
      - "20"
    body: example.com response
    http_version: "1.1"

Scenarios

Previously recorded responses are replayed
New requests result in an error when the cassette file exists
New requests get recorded when there is no cassette file

Previously recorded responses are replayed

Given

a file named "replay_recorded_response.rb" with:

require 'setup'

VCR.use_cassette('example', :record => :once) do
  response = Net::HTTP.get_response('example.com', '/foo')
  puts "Response: #{response.body}"
end

When

I run "ruby replay_recorded_response.rb"

Then

it should pass with "Response: example.com response"

New requests result in an error when the cassette file exists

Given

a file named "error_for_new_requests_when_cassette_exists.rb" with:

require 'setup'

VCR.use_cassette('example', :record => :once) do
  response = Net::HTTP.get_response('localhost', '/', 7777)
  puts "Response: #{response.body}"
end

When

I run "ruby error_for_new_requests_when_cassette_exists.rb"

Then

it should fail with "Real HTTP connections are disabled"

New requests get recorded when there is no cassette file

Given

a file named "record_new_requests.rb" with:

require 'setup'

VCR.use_cassette('example', :record => :once) do
  response = Net::HTTP.get_response('localhost', '/', 7777)
  puts "Response: #{response.body}"
end

When

I remove the file "cassettes/example.yml"

And

I run "ruby record_new_requests.rb"

Then

it should pass with "Response: Hello"

And

the file "cassettes/example.yml" should contain "body: Hello"

Last published over 5 years ago by myronmarston.

:once

Vcr settings