R package test suites that include HTTP requests are dependent on an internet connection being up, the internet connection speed, changing behavior of the remote server, as well as changing response formats/data from a remote server. We ideally want to test functionality of our package relative to some known data that isn’t intermittently unavailable or changing.

webmockr webmockr is an R library for stubbing and setting expectations on HTTP requests.It is a port of the Ruby gem webmock. webmockr works by plugging in to another R package that does HTTP requests. It currently only works with crul right now, but we plan to add support for curl and httr later.