Mock helpers

[teamon]

Currently to mock a JSON response one has to write:

Tesla.Mock.mock fn env ->
  {:ok, %Tesla.Env{status: 200, body: ~s|{"ok": true}|, headers: [{"content-type", "application/json}]}
end

Since this (and some other) cases are very common it would be useful to have:

Tesla.Mock.mock fn env ->
  json(%{"ok" => true})
end

or

Tesla.Mock.mock fn env ->
  json(%{"ok" => true}, status: 201)
end

Also, returning simple {200, [], "hello"} tuple instead of full Tesla.Env might be handy.

Right now the proposal is to have:

• Handle other return types with the following rules:
  • Tesla.Env => {:ok, Tesla.Env}
  • {status, headers, body} => {:ok, Tesla.Env{...}}
  • other => {:error, other}
• Add utility functions:
  • json(body, opts \\ []) :: Tesla.Env (status defaults to 200, set proper content type header)
  • text(body, opts \\ []) :: Tesla.Env (status defaults to 200, set proper content type header)
• Provide JSON engine configuration (config :tesla, Tesla.Mock, json_engine: Jason)
• Update REAMDE (with import Tesla.Mock.Helpers line)

[florinpatrascu]

hi @teamon - can I configure a different json engine, programmatically? I am porting my projects to 1.0.0-beta.1, but some of them have "hard" dependencies on Poison, so I have to stick with the latter for time being. ty!

[teamon]

config :tesla, Tesla.Mock, json_engine: Poison

[florinpatrascu]

hah, I was thrown on a wrong path being mislead by the Tesla.Mock, thinking you're planning to use it for tests (internally) only :) Thank you!