Running tests several times with several configurations

[Jorge Díaz]

Hi everyone,

Let's say I'm building a SDK for a certain XML-based protocol which can be consumed from several providers and I really need to do my integration testing to check with several of them and not only one. This means I need to hit several hosts and build expectations based on getting a valid responses form them. I know it's a bit unusual integration testing pattern but the whole point here about having an SDK is to provide isolation of the multiple issues with each of them (i.e. SOAP vs. non-SOAP).

I would like to cover this scenario while doing a proper use of ExUnit. Is it possible to launch a set of tests several times each of them loading a different config using Mix.Config from a file?

I'm quite new to Elixir so any clue at any level is welcome. :)

Cheers!

Jorge

[José Valim]

The simplest option is to have different test files in your project, each of them using a different configuration that you specify during setup.

A more complex alternative is to have multiple test environments. MIX_ENV=test_foo, MIX_ENV=test_bar and so on. And then specify config/test_foo.exs, config/test_bar.exs and so on. That's what Ecto uses to test multiple adapters/databases. The only issue is that Elixir will compile your project per environment but you can set that to false as build_per_environment: false in your mix.exs.

There are probably many options between those two, it is hard to say which one works better without more details.

José Valim

www.plataformatec.com.br

Skype: jv.ptec

Founder and Director of R&D

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