Add LeaderElectionSupport for unit testing

[tpantelis]

Refactored from the submariner project for reuse.

Related to submariner-io/submariner#2747

[submariner-bot]

🤖 Created branch: z_pr764/tpantelis/leader_election_test_support

[skitt]

Shouldn’t the various Await timeouts take the configured timeouts into account?

[tpantelis]

Shouldn’t the various Await timeouts take the configured timeouts into account?

AwaitLeaseAcquired could - that should take the lease duration to occur. We could use that timeout but that's really kind of internal to the leader election code and we're not trying to verify exactness in that code. But I'm fine either way.

AwaitLeaseReleased should happen quickly and is not dependent on any configured timeout.

AwaitLeaseRenewed is called after losing the lease so, after the failure is cleared, renewal should happen after the retry period but, again, that timing seems internal to the leader election.

[skitt]

Right, I’m not interested in verifying the leader election code itself; my concern was to avoid issues with tests in scenarios where the tests themselves set up specific timeouts (whether longer or short than we expect). If the timeouts involved here are internal to the leader election that’s fine.

[submariner-bot]

🤖 Closed branches: [z_pr764/tpantelis/leader_election_test_support]