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test: harden the conftest fixtures and close the IPv6 and SASL gaps - #285
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Included review availability: Your plan provides up to 2 included reviews per hour; 0 remain after this review. 📝 WalkthroughWalkthroughThe change hardens memcached test fixtures with endpoint checks, readiness polling, and cleanup. It enables TLS and SASL support in the Nix environment and adds IPv6 and SASL integration tests, plus broader distributed-hashing coverage. ChangesTest hardening and protocol coverage
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Other Sequence Diagram(s)sequenceDiagram
participant SASLDatabase
participant MemcachedSASL
participant Client
SASLDatabase->>MemcachedSASL: provide user database
Client->>MemcachedSASL: connect and authenticate
MemcachedSASL-->>Client: return authentication result
Client->>MemcachedSASL: set and get data
Merge Risk: ⚪ Minimal · up to The hardened fixtures and added integration coverage are merge-ready; no concrete unresolved risk remains. 🚥 Pre-merge checks | ✅ 3 | ❌ 2❌ Failed checks (2 warnings)
✅ Passed checks (3 passed)
Full details: Linked Issues checkExplanation Most coding requirements in Resolution Preserve the required startup-failure behavior specified by Full details: Docstring CoverageExplanation Docstring coverage is 41.94% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 31 functions across 4 files. (1 skipped: 1 unsupported.)
✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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In `@test/conftest.py`:
- Line 53: Update _wait_until_accepting and memcached_socket to tie readiness
and socket use to the fixture-owned child process: use per-session endpoints
where possible, or reject occupied fixed endpoints before launching the child
with a clear error, and never yield an already-active Unix socket without
establishing ownership.
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flake.nixtest/conftest.pytest/test_distributed_client_hashing.pytest/test_ipv6.pytest/test_sasl_integration.py
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Claude finished @jaysonsantos's task in 2m 50s —— View job Claude finished @jaysonsantos's taskTodo list
ReviewThis is a solid hardening pass — the retry-based readiness check, the stale-socket cleanup, and the new IPv6/SASL/hashing tests are a clear improvement over the previous fixed- Earlier bot findings already addressed in the current HEAD (
Still-open item worth a look: readiness is tied to the socket, not to the child process ( Checked and NOT an issue: the " Test content (
Not verified in this pass Overall: no new correctness issues found beyond what's already tracked in open review threads; the one substantive open item (readiness-vs-stray-process race) is low severity and already acknowledged as an accepted trade-off in the PR description. |
The fixtures started real memcached processes without any check that the start worked. Fixture changes in test/conftest.py: - Every fixture checks the process after start. A dead process or a missing memcached binary now gives one clear skip with the process stderr. It gave an opaque ConnectionRefusedError in every test before. - Every fixture replaces time.sleep(0.1) with a connect-retry loop and a 10 second timeout. A fixed sleep makes a slow start flaky. - pytest.yield_fixture becomes @pytest.fixture. The old name is a deprecated alias. - The unix socket file is removed before start and on teardown. A run that died before teardown left the file behind, and memcached then failed to bind. - The IPv6 server moves to port 5002. On Linux a plain memcached binds both INADDR_ANY and IN6ADDR_ANY, so port 11211 was already taken. - A new memcached_sasl fixture starts memcached with SASL enabled. It builds a temporary Cyrus SASL user database with saslpasswd2 and points SASL_CONF_PATH at a temporary config. It skips when saslpasswd2 is absent or when memcached is not built with SASL. New coverage: - test/test_ipv6.py does a real set, get, set_multi, and get_multi over IPv6. The IPv6 fixture ran on every session and tested nothing before. test/test_server_parsing.py only parses '::1' strings. - test/test_sasl_integration.py authenticates against a real SASL-enabled server and does a set and a get. test/test_auth.py mocks Protocol._get_response and feeds canned bytes, so it covers the client state machine only. - test/test_distributed_client_hashing.py tests the key-to-server mapping after a server joins and after a server leaves. That is the property consistent hashing exists for. The file asserted one key against one server ten times before. flake.nix builds memcached with SASL, in the same way it already builds it with TLS. It adds cyrus_sasl.bin to the dev shell for saslpasswd2. Without both, the SASL test always skips. Refs #274
The session-scoped IPv6 fixture was autouse, so pytest.skip on a missing IPv6 stack or a bound port 5002 skipped the whole suite. Request it only from the IPv6 tests. Unlinking /tmp/memcached.sock without a probe also tore down a live socket owned by another session. Connect first, reuse an active socket, and unlink only a stale leftover file. Co-authored-by: Jayson Reis <santosdosreis@gmail.com>
The rebase put these files onto a main that runs ruff check and ruff format. Keep the IPv6 fixture non-autouse and keep the unix socket probe before unlink. Co-authored-by: Jayson Reis <santosdosreis@gmail.com>
The readiness check accepted any listener on the fixed endpoint. A stray memcached or another service on that endpoint then served the tests in place of the fixture process. Each fixture now connects to its endpoint before it starts memcached. If a process already listens there, the fixture fails with a clear message. The unix socket fixture no longer reuses an active socket. After a connect succeeds, the wait loop also confirms that the child process did not exit. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01WGdME3krw5JKH4mKnAoeLX
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| pytest.skip(f"Cannot run {args[0]}: {error}. Is memcached on PATH?") |
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When memcached is absent or cannot be executed, this converts the setup failure into a skip; because the standard-port, alternate-port, and Unix-socket fixtures are all session-scoped and autouse, every test is consequently skipped and pytest exits successfully without validating the package. The fresh evidence after the earlier IPv6 fix is that only the IPv6 fixture was made opt-in—the three required fixtures still reach this shared skip path. Treat failure to launch the required base servers as an error, reserving skips for optional capabilities such as IPv6 or SASL.
AGENTS.md reference: AGENTS.md:L18-L18
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Fixed in the latest push. The standard-port, port-5000, and unix socket fixtures now fail when memcached is missing or does not start. Only the optional IPv6 and SASL fixtures still skip.
The three autouse fixtures skipped when memcached was missing or did not start. Every test then skipped, and pytest exited with success. These fixtures now fail. The IPv6 and SASL fixtures still skip, because they are optional. The Ubuntu package starts a system memcached on port 11211. The CI job now stops that service, so the fixtures can start their own server. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01WGdME3krw5JKH4mKnAoeLX
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What changed
test/conftest.pyis rewritten. Every fixture now checks that the processstarted, waits for the port with a retry loop, and uses
@pytest.fixtureinplace of the deprecated
pytest.yield_fixture. The unix socket file is removedbefore start and on teardown. The IPv6 server moves to port 5002. A new
memcached_saslfixture starts memcached with SASL authentication enabled.Three test files change or arrive:
test/test_ipv6.pyis new. It does a realset,get,set_multi, andget_multiover IPv6.test/test_sasl_integration.pyis new. It authenticates against a realSASL-enabled server and does a
setand aget.test/test_distributed_client_hashing.pygains four tests. They check thekey-to-server mapping after a server joins and after a server leaves.
flake.nixbuilds memcached with SASL, in the same way it already builds itwith TLS. It adds
cyrus_sasl.binto the dev shell forsaslpasswd2.Why
The fixtures started real memcached processes and never checked the result. A
missing
memcachedbinary failed every test with an opaqueConnectionRefusedError. A fixedtime.sleep(0.1)made a slow start flaky. Arun that died before teardown left
/tmp/memcached.sockbehind, and the nextrun then failed to bind.
Two coverage gaps were larger. The IPv6 fixture ran on every session and no
test connected to it, so nothing proved the IPv6 path worked end to end.
test/test_auth.pymocksProtocol._get_responseand feeds canned bytes, sono test ever ran against a server with authentication turned on.
test/test_distributed_client_hashing.pyheld 12 lines and asserted one keyagainst one server ten times. It never tested ring rebalance, which is the
property consistent hashing exists for.
Verification
Result:
271 passed. The baseline onmainis261 passed. This pull requestadds 10 tests and changes no existing count. It also removes four
PytestDeprecationWarninglines; one remains, fromtest/test_tls.py.Result: 0 errors.
The new tests, run alone:
Result:
6 passedand5 passed.The skip path, with
memcachedremoved fromPATH:Result:
3 skipped, each withCannot run memcached: [Errno 2] No such file or directory: 'memcached'. Is memcached on PATH?On
mainthis run fails instead, withConnectionRefusedError.Stale socket recovery:
Result:
44 passed, and/tmp/memcached.sockis gone after the run. Onmainthe memcached process fails to bind.
Risks
A reviewer must check four points.
saslpasswd2, which Ubuntu ships in thesasl2-binpackage, and amemcached built with SASL support.
.ci-before-script.shinstalls neither.Adding them belongs to the CI workflow issue (Modernize the tests-and-lint workflow and add Renovate #271), not here. The fixture
skips cleanly with a clear reason rather than failing. It does run and pass
in the Nix dev shell.
flake.nixchanges the memcached build. It adds--enable-sasland--enable-sasl-pwdbnext to the existing--enable-tls, and it addscyrus_saslas a build input. This forces a memcached rebuild on the firstnix developafter checkout. Verified locally:memcached --helpnow lists-S, --enable-sasl, and the full suite still passes.a plain
memcachedbinds bothINADDR_ANYandIN6ADDR_ANY, so thememcached_standard_portfixture already holds 11211 and the-l::1process cannot bind it. That failure was silent before, because nothing
checked the process and no test used the fixture.
collisions between two runners on one host. This pull request does not make
the ports dynamic. That is not in the acceptance criteria, and the test
files hardcode
:11211and:5000in many places. What did change is thefailure mode: a collision now gives one clear skip that names the port and
the memcached stderr, in place of an opaque error in every test.
Two findings came out of this work. Neither is folded into this pull request.
0x20. Theclient maps only
0x08toInvalidCredentials, so a wrong password raisesthe base
MemcachedException. The mocked test intest/test_auth.pyhidthis, because it feeds
0x08by hand.test/test_sasl_integration.py::test_wrong_password_is_rejectedasserts thereal behavior and names the issue in its docstring.
test/test_tls.py:16still uses the deprecatedpytest.yield_fixture. It is outside this issue's file list.On the related report: #250 says the unit tests do not run successfully on
Ubuntu. This pull request turns the most likely cause, a missing or slow
memcached, into a clear skip message rather than a wall of connectionerrors. It does not confirm the original diagnosis, so I have not closed that
issue.
Closes #274
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