environment-configuration

Is your feature request related to a problem? Please describe.
After scratching my head for an hour or more why a unit test of mine fails (but everything is fine in production) I finally noticed that is configures Dynaconf like this:

settings.configure(
    ENV_FOR_DYNACONF="testing",
    ROOT_PATH_FOR_DYNACONF=os.path.dirname(os.path.realpath(__file__)) + "/../../../config",
    R

I've noticed that when reading a config file with a field that is not available in env, its custom function won't run.

The reason seems to be that for these kind of fields, parseValue won't be called and therefore the corresponding custom function.

Custom functions runs only if the field was provided as an env argument or with

Pre-requisites:

• Yes, I looked through both open and closed issues looking for what I needed

Feature Description

simple-env should include an op