[go-nuts] Testing package with precondition validation in init()

I have a package that validates the presence of an environment variable in
it's init() function.
I do this in the init function to be absolutely sure the process is
configured correctly on launch time,
if it's not set the init() panics.

Now the problem is, I cannot really test the package since the required
environment flags are not
set when running the suite (and I cannot assume they're always set).

How would you tackle this problem?

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