Test fixes for consistent pass rates under repeated runs (-count=N):
Global state isolation:
- appc: check metric deltas instead of absolute values
- cmd/derper: initialize DNS caches before test
- tsweb/varz: use unpublished expvar to avoid global registration
- wgengine/netstack: check metric deltas instead of absolute values
- net/dns: use SetForTest() with deferred restore for hooks
Timeout and concurrency:
- cmd/containerboot: increase wait loop timeouts for parallel load
- tsconsensus: add deadline to waitFor(), use sync.Once for netns
- tstest/integration: add tstest.Shard/Parallel, fix IPN bus watchers
- net/netcheck: set testCaptivePortalDelay to prevent hangs
- wgengine/magicsock: use Port:0, add timeout to callback wait
- drive/driveimpl: use http.Server for proper shutdown
Race conditions:
- tstest/archtest: remove !race from build constraint
- util/deephash: use local sink variable instead of package-level
- net/art: switch to math/rand/v2 for thread-safe globals
- tstest/integration: use Status() instead of MustStatus() from goroutines
Test optimization:
- net/udprelay: rewrite VNI test to avoid iterating all 16M values
- ipn/ipnlocal: reset env vars between subtests
- cmd/containerboot/serve: use SetWaitDurationForTest
- tsnet: wait for service VIP in AllowedIPs before dialing
Change-Id: Id6186fb8a45031920550a208ded77382e57cc016
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Signed-off-by: Avery Pennarun <apenwarr@tailscale.com>
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