test(sns): Add unit tests for automatic upgrades triggered when target version ahead of deployed version #2784
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This PR contributes unit tests of the whole automatic-upgrade process (as triggered by target_version being set). It adds a test for Governance and Root.
Why add unit tests when we already have integration tests?
Certain scenarios are much easier to test via unit testing. These tests lay the groundwork for a test I want to write which will exercise edge cases w.r.t. archive canisters, which are too hard to exercise in an integration test