Heads up: network requests `Kernel#open` are not mocked with VCR

We usually rely on VCR Show archive.org snapshot and WebMock Show archive.org snapshot to prevent any real network connection when running our unit tests.

This is not entirely true: They are both limited to a set of HTTP libraries listed below (as of 2022). Direct calls to Kernel#open or OpenURI#open_uri are not mocked and will trigger real network requests even in tests. This might bite you e.g. in older versions of CarrierWave Show archive.org snapshot with remote file URLs.

Supported libraries

VCR:

Patron (when using WebMock)
Curb (when using WebMock -- only supports Curl::Easy at the moment)
HTTPClient (when using WebMock)
em-http-request (when using WebMock)
Net::HTTP (when using WebMock)
Typhoeus (Typhoeus::Hydra, but not Typhoeus::Easy or Typhoeus::Multi)
Excon
Faraday
Net::HTTP (inlcudes Mechanize, HTTParty, Rest Client, ..)

WebMock

Async::HTTP::Client
Curb (currently only Curb::Easy)
EM-HTTP-Request
Excon
HTTPClient
HTTP Gem (also known as http.rb)
httpx
Manticore
Net::HTTP and other libraries based on Net::HTTP, e.g.:
HTTParty
REST Client
Patron
Typhoeus (currently only Typhoeus::Hydra)

Michael Leimstädtner

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Last edit

Over 1 year ago

Michael Leimstädtner

License

Source code in this card is licensed under the MIT License.

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Posted by Michael Leimstädtner to makandra dev (2022-12-13 16:21)

Heads up: network requests `Kernel#open` are not mocked with VCR

Supported libraries

VCR:

WebMock

Related cards:

Bundler

Example output for bundle outdated --filter-major

Other examples

General

Step 1: Make Opensearch available for ...

Example output for `bundle outdated --filter-major`