Decouple Shadowenv test from specific dev setup#4087
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Motivation
Step towards #2877
We were actually bitten (even more than once) by the same problem that affects contributors. Our extension tests are too tied to specific machine setups, so if anything changes, they fail locally while passing on CI.
Currently, shadowenv tests are failing locally. This PR decouples the test from the real shadowenv executable and re-writes everything to test the logic without depending on machine setup.
Implementation
The idea is to simply use stubs to verify the different situations that can happen. We no longer actually download and invoke the executable.