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Assert occasional ping directly instead of via a latency threshold (#68) - #70
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…threshold PingTests.PingStatisticsAndOccasionalPing failed intermittently (7/12 under CPU load, 40/40 idle) on assertions that measure the host rather than the library: a loopback average of 12 ms against a 10 ms ceiling is the scheduler, not a bug. It also bound fixed port 60000, which CLAUDE.md warns against. Loosening the ceilings alone would have removed coverage. A mutant making SetOccasionalPing a no-op is caught today -- but only because one missing ping sample leaves the average above 10 ms. The absolute threshold was doing double duty as the sole check on the feature the test is named after, indirectly and by a margin of 2 ms. So the coverage is moved before the thresholds are relaxed: - OccasionalPingIsObservableAsPingTraffic counts ID_CONNECTED_PING arriving at the receiver through a PluginInterface2 OnInternalPacket hook. SetOccasionalPing has no public observable -- the pings never surface as packets -- and this is the layer where they are visible. Two senders run in the SAME window, one with the flag on and one off, so the only difference between the counts is the flag rather than two stretches of machine time. The window is 11 s to outrun the 5 s interval in peer.cpp. - The statistics test gains the relational assertions, which hold at any latency: statistics are populated at all, lastPing >= lowestPing, averagePing >= lowestPing. These fail only on a real bug. - Absolute ceilings become a single generous set (no CI/non-CI split: a test held to different standards per environment cannot be reproduced locally when CI fails) and are asserted last, so a load-induced trip no longer hides the real invariants. - OS-assigned ephemeral port. Verified on macOS arm64: - new test vs the no-op SetOccasionalPing mutant: fails 3/3, reporting "2 pings with it enabled vs 2 with it disabled" - clean margin is stable at 4 pings on vs 2 off across 4 runs - statistics test under the CPU load that gave 7/12: now 12/12 - full ctest 285/285 Fixes #68
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WalkthroughThe ping integration tests now use an OS-assigned receiver port and revised ping-statistics assertions. A new test counts incoming connected-ping packets from two senders and compares results when occasional ping is enabled or disabled. ChangesPing integration tests
Priority: ⬇️ Low Estimated code review effort: 2 (Simple) | ~12 minutes Change: Other · Severity of issue fixed: Low Merge Risk: 🟡 Moderate · up to A ping-test failure can become a crash during cleanup and obscure the original failure. Keep the plugin alive through teardown before merging. 🚥 Pre-merge checks | ✅ 3 | ❌ 2❌ Failed checks (2 warnings)
✅ Passed checks (3 passed)
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Review comments at @Tests/Integration/PingTestsTests.cpp:
- Line 255: Move ConnectedPingCounter from the test body into the PingTests
fixture so it remains alive through TearDown(), including when an ASSERT_
returns early; ensure its declaration is visible to the fixture, and remove the
local counter declaration.
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Tests/Integration/PingTestsTests.cpp
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Review finding on #70, and a real one. ConnectedPingCounter was a local in the test body, while the receiver it is attached to is owned by destroyList and destroyed later in TearDown(). Any failed ASSERT_ before the detach -- the Startup check or either connect check -- returns with the plugin still attached and then destroys it, after which Shutdown() makes a virtual call into it (peer.cpp, OnRakPeerShutdown) and the network thread can still deliver OnInternalPacket during the shutdown window. Confirmed under ASAN by forcing an early return: the unfixed test dies with "AddressSanitizer: BUS on unknown address (pc 0x03e014000007)" -- a corrupted vtable pointer -- so one failed assertion became a crash that hid the original failure. With the plugin as a fixture member the same forced failure reports cleanly and keeps its message, and ASAN is silent. A fixture member is destroyed after TearDown() returns, so it outlives every peer that could call into it and the explicit DetachPlugin is no longer needed. This is what CLAUDE.md requires: cleanup must survive a failed ASSERT_, never rely on code after the assertions. Not adopted from the review: moving ConnectedPingCounter out of the anonymous namespace. It is already declared above the fixture, so the fixture can name it as is. Verified: full ctest 285/285, plus both ping tests clean under ASAN.
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Good catch on the plugin lifetime — adopted, and it was worse than "potential". Fixed in 3da3388. Confirmed under ASAN. Forcing an early return in the occasional-ping test:
The reachable path is exactly as described:
One part not adopted: moving Also worth recording that my first verification attempt was wrong: I inserted the forced Full ctest 285/285; both ping tests also clean under ASAN. |
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Fixes #68. Test-only; the library is untouched.
The finding that shaped the fix
The obvious fix — loosen the thresholds — would have removed coverage, so I checked before doing it.
A mutant making
SetOccasionalPinga no-op is caught today. But not by anything named for it: it's caught because one missing ping sample leaves the average at 12 ms against a 10 ms ceiling. The absolute latency threshold was doing double duty as the only check on the feature the test is named after — indirectly, and by a 2 ms margin. That is also exactly why it tripped on machine load: the same 2 ms decided both.So the coverage is moved before the thresholds are relaxed.
Changes
New
OccasionalPingIsObservableAsPingTraffic. CountsID_CONNECTED_PINGarriving at the receiver via aPluginInterface2::OnInternalPackethook.SetOccasionalPinghas no public observable — the pings it triggers are consumed inside the library and never surface as packets — and this is the layer where they are visible.Both senders run in the same observation window against the same receiver, one with the flag on and one off. Sequential phases would compare two different stretches of machine time; side by side the only difference between the counts is the flag. The window is 11 s to outrun the 5 s interval (
peer.cpp:nextPingTime = timeMS + 5000).Statistics test keeps its absolute bounds but gains the relational ones, which hold at any latency and so fail only on a real bug:
The absolute ceilings are now a single generous set and are asserted last, so a load-induced trip no longer hides the real invariants. I dropped the
CI/non-CI split deliberately: a test held to different standards depending on environment can't be reproduced locally when it fails in CI.Ephemeral port instead of fixed 60000, per CLAUDE.md.
Verification (macOS arm64)
SetOccasionalPingmutantctestThe ping counts are printed on success as well as failure, so a future reader can watch the margin narrow before it starts failing.
What I deliberately did not do
The issue floated a separate labelled performance suite for the absolute thresholds. I didn't build one — it's a new ctest label and a new category of test for two numbers whose only job here is to catch a gross regression. If you want real latency regression tracking, that belongs with the benchmark work in #51, not bolted onto this test.
Cost
The new test takes 11 s, because the interval it verifies is 5 s. That's the price of asserting the feature rather than inferring it. If suite runtime matters more, the alternative is dropping it and accepting that
SetOccasionalPingis untested — I'd rather have the 11 s.Summary by CodeRabbit