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What type of PR is this?
Bug fix
What does this PR do? Why is it needed?
I started out trying to fix a racy test in the validator code and wound up doing a cleanup pass on how we set up the mock keymanager. Goal is to make test setup more concise and easy to read, get rid of unnecessary boilerplate. Most importantly give tests control over the ordering of the return value from the
FetchValidatingPublicKeys
mock method, since the mock tests are a bit fragile and can break due to the non-deterministic ordering from iterating over the keymap.