Objective: make the tests more robust and reduce random failures.
Preliminary refactoring:
- Accept testing.TB in testenv helpers. This is needed to
use `require.EventuallyWithT` in socket activation tests.
- Rename parameters for clarity
Tests refactoring:
- use t.Cleanup instead of defer where appropriate
- create file handlers in test routine instead of go routines
- remove unnecessary var declaration
- increased wait time to 30 seconds.
- allow running socket activation test on Darwin
Ref:
- #3283
- #3313
- #3318
* fix(snapshots): Remove checkpoints after a complete snapshot
... by setting start time of checkpoints one nanosecond earlier than
that of the snapshot.
* test(snapshots): Test for leftover checkpoints
* fix linter issues
* removed stray curly brace
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Co-authored-by: Jarek Kowalski <jaak@jkowalski.net>
