perf(providers): parallelize isolated provider unit tests and shrink retry backoffs - #955
perf(providers): parallelize isolated provider unit tests and shrink retry backoffs#955hazyhaar wants to merge 4 commits into
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Included review availability: Your plan provides up to 4 included reviews per hour; 1 remains after this review. WalkthroughProvider tests for Anthropic, Gemini, and OpenAI now run in parallel. A restorable helper shortens retry backoffs during tests. Cache-write-token parsing receives additional test assertions. ChangesProvider test parallelization
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: ⚪ Minimal · up to The PR speeds up isolated provider tests by enabling parallel execution and shortening retry waits during tests; no actionable merge-blocking risk remains beyond normal checks and review. Suggested reviewers: 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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Inline comments:
In `@internal/providers/providerio/retry.go`:
- Around line 52-61: In retry_test.go, add a focused test for
ShrinkBackoffForTest that records the original retryBackoffBase and
preSendBackoffBase, verifies both are set to one millisecond while the helper is
active, then invokes the returned restoration closure and verifies both values
are restored.
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📒 Files selected for processing (19)
internal/providers/anthropic/cache_breakpoints_test.gointernal/providers/anthropic/dropped_test.gointernal/providers/anthropic/finish_reason_test.gointernal/providers/anthropic/idle_test.gointernal/providers/anthropic/image_test.gointernal/providers/anthropic/provider_test.gointernal/providers/anthropic/stop_reason_test.gointernal/providers/factory_turn_session_test.gointernal/providers/gemini/done_test.gointernal/providers/gemini/finish_reason_test.gointernal/providers/gemini/idle_test.gointernal/providers/gemini/images_test.gointernal/providers/gemini/provider_test.gointernal/providers/openai/codex_terminal_test.gointernal/providers/openai/codex_test.gointernal/providers/openai/provider_test.gointernal/providers/openai/reasoning_effort_test.gointernal/providers/openai/session_test.gointernal/providers/providerio/retry.go
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Vasanthdev2004
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Vasanthdev2004
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This is sound and the win is bigger than the title suggests. On base, internal/providers/openai takes 181.5s and internal/providers/anthropic 121.5s, almost entirely the 429 and 503 cases burning the full 2/4/8/16/30s schedule over six attempts. On this branch both are 1.3s. gemini was already 1.4s, which is why it correctly gets no init() shrink.
Nothing is skipped to get there. -v PASS counts are identical on base and on this head (openai 113, anthropic 30, gemini 33).
What I checked, since parallelising 146 tests is the kind of change that pays out later:
- No
t.Setenvcollision. The onlyt.Setenvcalls in a parallelised file are inTestOpenAIRequestPromptCacheKey, which you deliberately left serial, and no helper reached from a parallel test calls it. Everything else that touches the environment lives in packages or tests that stayed serial. - No shared mutable state. None of the four test packages declare package-level vars, and the only production globals in play are providerio's
retryBackoffBaseandpreSendBackoffBase, both set once frominit()before any test runs.t.Parallel()is the first statement in all 146 cases, and servers are closed viat.Cleanupor a deferred Close. - Production defaults untouched: 2s and 500ms stay as they were.
-raceclean at-count=4,-count=10 -parallel 64,-count=8 -cpu=1and-count=25 -parallel 4, plus a full-race ./....
Two notes, neither blocking.
TestCodexProviderStreamIdleTimeoutPropagates now runs in parallel while configuring StreamIdleTimeout: 50 * time.Millisecond and asserting the stream produces no error event. Its own comment says the fast path does not hit the timeout and the test just confirms the option is accepted, so the 50ms is incidental rather than the thing under test, but it is now a wall-clock window that parallelism can close. I did see it fail this way once, at -race -count=15 -parallel 128 under 160 burner threads:
unexpected error event: "provider stream error: idle timeout after 50ms (upstream stopped sending data)"
Being straight about the calibration: it does not reproduce at CI-realistic parallelism, and the same load at -parallel 1 passed. So this is a "raise the constant or leave this one serial" note, not a reason to hold the PR.
ShrinkBackoffForTest is exported from production retry.go, so it is reachable from the shipped binary even though the only callers are the two test init()s. The deadcode step that would surface it is continue-on-error, so nothing will flag it. Moving it behind export_test.go would close that off, if you want it closed.
Approving.
jatmn
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jatmn
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I found issues that need to be addressed before this is ready.
Merge readiness
- [P1] Rebase onto current
mainbefore merge
internal/providers/openai/codex_test.go:770
The PR merge base (ad34dc8...) is behind livemain(1b5db176...). The intervening target change added cache-write-token coverage in bothinternal/providers/openai/codex_test.goandprovider_test.go, andmerge-treenow reports them as changed in both. Rebase and review the resolved diff so the PR does not discard those upstream test contracts.
Findings
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[P2] Keep the Codex timeout acceptance test out of the parallel pool
internal/providers/openai/codex_test.go:748
This PR, and not merge-base or currentmain, addst.Parallel()to the test that configuresStreamIdleTimeout: 50 * time.Millisecond. The wrapped OpenAI provider passes that value toScanSSEDataWithContext, which starts a real-wall-clock idle timer and returnsErrStreamIdlewhen it wins the select.drainCodexEventstreats that event as a fatal test failure.The server writes
response.completedsynchronously, but once this test competes with the newly parallel provider suite, there is no guarantee that the server handler, HTTP read, SSE scanner, and consumer will run within 50ms. The test's own comment says it only verifies that the option is accepted, not that a 50ms idle expiry behaves correctly.Restore the serial scheduling for this test or split the concerns: assert option propagation without arming a tiny live watchdog, and leave the deterministic stalled-stream tests to exercise timeout behavior. This addresses the root cause — a timing-sensitive assertion in the new concurrent schedule — without reversing the product timeout contract or blocking parallelism for the rest of the suite.
…retry backoffs Enable t.Parallel() on independent provider test cases and shrink default retry backoffs from seconds to 1ms during test runs, reducing provider test suite duration from ~300s to ~2.4s without flakiness.
StreamIdleTimeout arms a wall-clock watchdog. Parallel scheduling can lose the 50ms race against response.completed even though the test only checks that the option is accepted.
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Summary
Provider unit tests in
internal/providers/openaiandinternal/providers/anthropicpreviously took >300 seconds to run because:t.Parallel().Key Changes
ShrinkBackoffForTest()ininternal/providers/providerioto clamp retry backoff bases to 1ms during test execution.t.Parallel()on isolated provider test cases (each running on independenthttptest.Serverinstances).go test -race.Summary by CodeRabbit
Tests
Refactor