Currently, tests that use env variables can't be run async because the
environment is shared. My proposal is to introduce a with_env function that
will accept a function to execute and a mapping of params that the
functions in System will accept as env variables:
Now: System.put_env("PORT", "4000")
assert some logic
System.delete_env("PORT")
after
with_env(%{"PORT" => "4000}, fn ->
assert some logic
end)
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