fix(tests): stop listener tests failing when another process holds their port - #156
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…ollides Move nextListenPort and canBindLoopback into a shared TestPorts helper and use it for the live egress forwarder (was port 0) and the stable-port tests that hard-coded 18099, 18077, 18443 and 18944. Add TestPortsTests for the held-port and TIME_WAIT refusals.
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Included review availability: This review used your included allowance. Your plan provides up to 2 included reviews per hour; 0 remain after this review. 📝 WalkthroughWalkthroughListener tests now use a shared allocator to select available loopback ports. The allocator scans ports 20,000–48,999 and checks each candidate by attempting a loopback bind. Tests cover port availability, allocation range, and uniqueness. ChangesListener port test infrastructure
Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~20 minutes Change: Bug fix Merge Risk: ⚪ Minimal · up to The identified test-hang path is addressed; no established issue remains that should block merging. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
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Full details: Docstring CoverageExplanation Docstring coverage is 65.71% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 35 functions across 8 files. (1 skipped: 1 unsupported.)
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Inline comments:
Review comments at @Tests/VPNBypassTests/TestPortsTests.swift:
- Around line 33-34: Update the client setup in the TestPortsTests flow to use
throwing guards for successful socket creation and connect before calling
Darwin.accept. Register listener and client descriptor cleanup with defer so
both are released on success or failure.
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📒 Files selected for processing (9)
Tests/VPNBypassTests/ControlSurfaceTests.swiftTests/VPNBypassTests/LiveProxyEgressTests.swiftTests/VPNBypassTests/LoopbackPeerAuthTests.swiftTests/VPNBypassTests/ProxyForwarderTests.swiftTests/VPNBypassTests/ProxyListenerManagerTests.swiftTests/VPNBypassTests/TestPorts.swiftTests/VPNBypassTests/TestPortsTests.swiftdocs/CHANGELOG.mddocs/development.md
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PR #146 fixed the flaky proxy tests, but two tests still sat on ports that can break them.
LiveProxyEgressTestsstarted its forwarder on port 0, which lands the listener in the range client sockets take their source ports from, the collision #146 found.ControlSurfaceTests.testRouteSetRepointsLiveListenerKeepingStablePortexpected the fixed port 18099, so it failed whenever anything on the Mac held that port: the route listener fell back to a random one and the stable-port check broke. The same was true of 18077 inProxyListenerManagerTestsand 18443 and 18944 in the two live tests.nextListenPort()andcanBindLoopback()move out ofProxyForwarderTestsintoTests/VPNBypassTests/TestPorts.swift. Every test that starts a listener a client dials now takes its port from it. NewTestPortsTestscheck that the helper refuses a port a listener holds, refuses a port a closed connection left in TIME_WAIT, and hands out ports in 20000-48999 below the ephemeral range, each once. Development has a short section on it.What still uses port 0 or a literal, and why it stays:
LoopbackPeerAuthTestslines 25 and 51 (port: .any): no client dials these. They only look up the listen socket through libproc, so there is no connect() to collide with a TIME_WAIT, and the kernel gives out a port no socket holds. The 0.0.0.0 one could not use the helper anyway, since it checks 127.0.0.1 only. There is a comment above them now.ProxyForwarderTests.testPortZeroReportsTheAssignedPort: tests port 0 on purpose, nothing dials it.DocScreenshotsTests18168: the port printed in the doc screenshots, so it has to stay that number. Nothing dials it. The render now fails if the listener is not on 18168. It used to pass and draw whatever port the listener fell back to. It is skipped unlessVPNB_DOC_SCREENSHOTSis set.ProxyListenerManagerTests.testReconcileStartsThenStopsForwarderandtestReconcileStartsListenerForTailscaleExitRoute: their routes have nolocalListenPort, so they bind the port derived from the route id (18000-18999) and fall back to port 0 if it is taken. Nothing dials them and they only check that a port exists, so either port works.CommandRouterTests18042 and 18100,HookGeneratorTests18101 and 18102,ProxyRuleReachTests18168, the fingerprint test's 18123, the parsing tests' 8080 and 3000) are values in strings or structs. Nothing binds them.Evidence (Mac mini)
Old fixed-port tests on
origin/main, with a Python process holding 127.0.0.1:18099 and 18077:The same two tests on this branch with the same ports held, plus
TestPortsTests:Executed 5 tests, with 0 failures.Thirty runs of
ProxyForwarderTests|ProxyListenerManagerTests|ControlSurfaceTests|LoopbackPeerAuthTests|LiveProxyEgressTestsin one shell undertrap 'kill 0' EXIT:origin/main): 0 of 30 runs failed (61 tests a run, 3 live ones skipped)TestPortsTestsadded): 0 of 30 runs failed (64 tests a run)Nobody held 18099 during those runs, and the live tests skip without
OXY_LIVE/TS_LIVE, so the loop could not have caught either problem on main. The held-port run above is the one that shows the difference.Each new check went red once with a broken helper, then I restored the line by hand:
SO_REUSEADDRset incanBindLoopback: onlytestRefusesAPortLeftInTimeWaitfailed ("port 38749 still has a TIME_WAIT and must not be handed out")canBindLoopbackalways returning true: both refusal tests failedtestHandsOutPortsBelowTheEphemeralRangeOnceEachfailed ("port 23736 handed out twice")The doc screenshot check, on the mini with a Python process holding 127.0.0.1:18168: the new assertion fails with
XCTAssertEqual failed: ("Optional(61866)") is not equal to ("Optional(18168)"). The oldXCTAssertNotNilpasses the same run. With the port free, the render passes.Full suite after merging main:
Executed 1470 tests, with 10 tests skipped and 0 failures.scripts/check-localizations.pyexits 0. No user-facing strings or views change, so there are no renders.Summary by CodeRabbit
Tests
Documentation