Project: Vcr 2.7.0

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:

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

require 'vcr'

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

And

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

--- 
http_interactions: 
- request: 
    method: get
    uri: http://example.com/foo
    body: 
      encoding: UTF-8
      string: ""
    headers: {}
  response: 
    status: 
      code: 200
      message: OK
    headers: 
      Content-Length: 
      - "20"
    body: 
      encoding: UTF-8
      string: example.com response
    http_version: "1.1"
  recorded_at: Tue, 01 Nov 2011 04:58:44 GMT
recorded_with: VCR 2.0.0

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"

@exclude-jruby 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 "An HTTP request has been made that VCR does not know how to handle"

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 "Hello"

Last published about 5 years ago by myronmarston.

:once

Vcr settings