Redefine ENV variable inside a EDN file using aero

Question

I'm trying to redefine a value of an env variable inside an EDN file in order to write some tests.

Basically, I have an EDN file (simplified here) like this:

{:foo #include #or [#env SOME_VAR "default.edn"]}

Here I am using https://github.com/juxt/aero in order to have these tag literals (#include, #or and #env)

Aero handles the #env thing using System/getenv, so I tried to use with-redefs to temporarily redefines it, but without success.

So, any tip here on how to do it?

Thanks in advance