I guess you can say @wojtekmach nerd sniped me into trying out backing Req.Test mocks with Bandit, so that your test Req test requests are actually going through an HTTP stack (instead of only invoking a Plug function). You can optionally use X509 in order to use HTTPS for those test requests.

Caveat: I have no idea if this is a good idea or not, but it’s fun to play with and it’s working for me!

With ReqTestBandit, you still use Req.Test to register the stub & mock requests, and it still uses Req.Test’s ownership model, in fact as a user of this library not much needs to change.

If you have a setup similar to that given in Req.Test’s example, then you’d want to add bandit: true to the app config:

config :myapp, weather_req_options: [
  bandit: true,
  plug: {Req.Test, MyApp.Weather},
  x509: true # optional, if you want to use HTTPS
]

Lastly the plugin needs to be attached:

def get_temperature(location) do
  [
    base_url: "https://weather-service",
    params: [location: location]
  ]
  |> Keyword.merge(Application.get_env(:myapp, :weather_req_options, []))
  |> Req.new()
  |> ReqTestBandit.attach()
  |> Req.request()
end