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Project: Vcr 2.0.0.rc1

exclusive cassette

VCR allows cassettes to be nested. This is particularly useful in
a context like cucumber, where you may be using a cassette for an
entire scenario, and also using a cassette within a particular step
definition.

By default, both the inner and outer cassettes are active. On each
request, VCR will look for a matching HTTP interaction in the inner
cassette, and it will use the outer cassette as a fall back if none
can be found.

If you do not want the HTTP interactions of the outer cassette considered,
you can pass the :exclusive option, so that the inner cassette is
used exclusively.

Background
Given
a previously recorded cassette file "cassettes/outer.yml" with:
---
http_interactions:
- request:
    method: get
    uri: http://localhost:7777/outer
    body: ''
    headers: {}
  response:
    status:
      code: 200
      message: OK
    headers:
      Content-Length:
      - '18'
    body: Old outer response
    http_version: '1.1'
  recorded_at: Tue, 01 Nov 2011 04:58:44 GMT
recorded_with: VCR 2.0.0
And
a previously recorded cassette file "cassettes/inner.yml" with:
---
http_interactions:
- request:
    method: get
    uri: http://localhost:7777/inner
    body: ''
    headers: {}
  response:
    status:
      code: 200
      message: OK
    headers:
      Content-Length:
      - '18'
    body: Old inner response
    http_version: '1.1'
  recorded_at: Tue, 01 Nov 2011 04:58:44 GMT
recorded_with: VCR 2.0.0
And
a file named "setup.rb" with:
include_http_adapter_for("net/http")

start_sinatra_app(:port => 7777) do
  get('/:path') { "New #{params[:path]} response" }
end

require 'vcr'

VCR.configure do |c|
  c.hook_into :fakeweb
  c.cassette_library_dir = 'cassettes'
  c.default_cassette_options = { :record => :new_episodes }
end
Scenarios
Cassettes are not exclusive by default
Given
a file named "not_exclusive.rb" with:
require 'setup'

VCR.use_cassette('outer') do
  VCR.use_cassette('inner') do
    puts response_body_for(:get, "http://localhost:7777/outer")
    puts response_body_for(:get, "http://localhost:7777/inner")
  end
end
When
I run ruby not_exclusive.rb
Then
it should pass with:
Old outer response
Old inner response
Use an exclusive cassette
Given
a file named "exclusive.rb" with:
require 'setup'

VCR.use_cassette('outer') do
  VCR.use_cassette('inner', :exclusive => true) do
    puts response_body_for(:get, "http://localhost:7777/outer")
    puts response_body_for(:get, "http://localhost:7777/inner")
  end
end
When
I run ruby exclusive.rb
Then
it should pass with:
New outer response
Old inner response
And
the file "cassettes/inner.yml" should contain "body: New outer response"

Last published about 2 years ago by myronmarston.