Does conform work without release?

Is it possible to use conform like described in the docs when using `mix phx.server` (using phoenix) or `iex -S mix` or with `mix test`?

I tried `iex` and `test` but both didn't seem to work. In both cases the value from `config.exs` was used when fetching the property with `Application.get_env()`.

So is this lib only intended to use in conjunction with destillery or can it also be used in development / testing environments without a release?