fix: Use contextmanager for process creation in tests #534
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About this change - What it does
Use
@contextmanager
for handling ZooKeeper and Kafka test processes.Why this way
This makes sure that the responsibility for stopping running processes does not leak to call sites, but is rather handled in the same place as the processes are spawned. This was found when upgrading pylint to latest version, which introduces a lint error for these cases.