Files
PaperClipAI/server/src/services/native-runtime/native-run-trace.test.ts
T
Nicky LeachandPaperclip 1d571de5f9 Add shared native turn attribution boundaries (#18213)
## Thinking Path

> - Paperclip manages work performed by AI agents.
> - Native execution crosses the plugin worker, Runner, sidecar, and
durable event boundaries.
> - Existing outer spans leave repeated preparation and admission work
unattributed.
> - Optimizations need a common baseline with accurate ownership and
event meanings.
> - This change extends the existing opt-in tracing contract with
bounded timing receipts.
> - It preserves execution policy and keeps provider internals opaque
where the API provides no timing proof.

## Linked Issues or Issue Description

**What existing behavior does this improve?**
Attribution of native task preparation, retained/cold Runner handoff,
and completion-to-text work.

**Current behavior**
Worker spans use a flat provider contract. Workspace calls lack a
consistent dispatch envelope. Submitted-to-started timing is named as a
provider queue even though it includes other work. The transport does
not expose a shared breakdown of its waits.

**Proposed improvement**
Add invocation-scoped nesting, bounded numeric remote receipts,
current-run transport timing, durable receipt intervals, and distinct
completion/text milestones. Reuse the existing exporter. No latency
optimization is included.

Related public work: #17842 consolidates existing startup tracing tests;
it does not add this runtime coverage.

## What Changed

- Extend the optional SDK tracer with nested async scopes and completed
timing receipts. Keep the host responsible for parent identity,
capability checks, attributes, clocks, depth, and count limits.
- Add dispatch and bounded host-read timings for environment and
workspace providers.
- Resolve transport parents on each call so retained sessions do not
retain an earlier run's trace.
- Split cold/resume/attach/prepare/registration/command/started-event
waits. Add opt-in numeric ACPX Runner/sidecar status and prompt-start
receipts.
- Distinguish first completion request, validated tool receipt, final
result commit, first nonempty text, and event persistence. Rename the
submitted-to-started interval to match its meaning.
- Link completed earlier remote lifecycles to their host-owned observer
rather than placing them under a later polling request. Preserve
sampling, timestamp limits and budgets.
- Document the versioned coverage map, causal clock limits, and baseline
acceptance requirements.

## Verification

- Current head: GitHub CI is fully green. Standard Greptile and Apex are
both 5/5, with no unresolved review threads. Full-suite validation was
performed in CI; follow-up local validation was limited to affected
packages and tests.

- Review follow-up: early rejection, missing provider capability and
startup-parent regressions were reproduced and fixed. The affected
worker/SDK/timing set passes 128 tests; 28 timing/context tests, SDK
typecheck and direct server TypeScript checking pass. The server
typecheck wrapper reached an unrelated Runner rebuild and stopped
because Cargo was absent from PATH; full Runner/image validation remains
in CI.

- CI failure accounting: the earlier Turbo cache/force conflict and
Linux OpenCode shell assertion were reproduced and diagnosed. A direct
proc probe ruled out permissions; a portable shell comparison identified
Bash skipping BASH_ENV with stripped SHLVL and socket stdin. Upstream
#18230 now supplies the CI and ignored-stdin fixture fixes; this PR
adopts them without duplicate CI changes. The strict Linux OOM assertion
passed before this source-equivalent merge.
- Retry follow-up: the three insertion/replay/failure timing cases and
server typecheck pass. The existing database regression now asserts a
single marker across identical result replay; the current-head CI
integration gate passes.
- Upstream CI alignment: all three real-Turbo 2.11.10 integration cases
pass. The repository policy gate rejected committing a generated
lockfile; the final PR contains no lockfile edit and uses the maintained
inline stale-lockfile recovery.
- Linked-lifecycle follow-up: 44 focused host/export tests pass (three
optional SDK-dependent cases skip); SDK and server typechecks pass. The
API contract test verifies an explicit root context, host-owned observer
link and unsampled suppression.
- SDK typecheck and focused worker/invocation tests: 30 passed,
including clock changes, bounded legacy IPC, and manual-span
creation-scope parentage.
- Focused reviewed host/native/transaction-boundary checks: 44 passed.
The 86-test worker-manager suite passes after updating its exact
assertions for the host-owned timing budget found by CI. Earlier
preparation/first-text checks also passed.
- Affected server and Runner TypeScript checks pass after building local
workspace declarations.
- Merge follow-up: the profile/candidate startup subset passes 94 tests,
the four Grok source-identity checks pass, and Runner TypeScript
checking passes. A subsequent execution-factory merge passes 21 focused
timing/trace tests and server TypeScript checking.
- Pinned Rust build and the ACPX Rust subset pass. The hostile receipt
projection test passes. Source profile compatibility checks: 127 passed,
one existing skip. Grok identity checks: four passed.
- Broad transport/ACPX suite: 410 passed after building all fake
provider binaries. Earlier attempts failed on missing
Runner/fake-provider outputs; building the required fixtures resolved
those failures.
- The first CI run correctly rejected stale source attestations. After
integrating current master, Grok advances 13→14 and Copilot 84→85;
master’s historical fixtures and Pi 35 stay byte-identical. Provider
dependencies, models and permission defaults are unchanged. Identity
generation/checks now pass.
- The added real-Postgres result lock regression could not initialize
its local embedded cluster. The insertion/replay/failure unit
regressions pass. The current-head CI integration gate passes.
- Comprehensive repository checks and image builds are delegated to CI,
as requested for this instrumentation pass. No deployment, model run,
collector-ingestion proof, or latency improvement is claimed.

## Risks

The new SDK methods are optional. Legacy span calls and endpoint-off
behavior remain supported. The host accepts only closed timing names and
bounded attributes. Remote durations are anchored at local receipt;
transport/scheduling uncertainty remains explicit. Trace trees have
count/depth limits. The first rollout must inspect actual collector
exports before treating the baseline as accepted. Fresh live
qualification for the new source identities remains a rollout
requirement. Revert these commits to remove the new measurements; no
schema migration is required.

## Model Used

OpenAI Codex, GPT-6 family, with reasoning and local code/tool
execution. The exact runtime model ID and context-window size are not
exposed in this session.

## Checklist

- [x] I have included a thinking path that traces from project context
to this change
- [x] I have specified the model used (with version and capability
details)
- [x] I have checked ROADMAP.md and confirmed this PR does not duplicate
planned core work
- [x] I have searched GitHub for duplicate or related PRs and linked
them above
- [x] I have described the issue in-PR following the enhancement
template
- [x] I have not referenced internal/instance-local Paperclip issues or
links
- [x] My branch name describes the change and contains no internal issue
details
- [x] I have run tests locally and they pass
- [x] I have added or updated tests where applicable
- [x] I have updated relevant documentation to reflect my changes
- [x] I have considered and documented any risks above
- [x] All Paperclip CI gates are green
- [x] Standard Greptile and Apex are both 5/5, with no unresolved
findings
- [x] I will address all Greptile and reviewer comments before
requesting merge

---------

Co-authored-by: Paperclip <noreply@paperclip.ing>
2026-10-29 17:45:56 -07:00

507 lines
19 KiB
TypeScript

import { describe, expect, it, vi } from "vitest";
import type { AdapterRuntimeEvent } from "../../adapters/index.js";
import { getActiveStepContext } from "@paperclipai/adapter-utils/acpx-engine/startup-timing";
import type { StartupTraceContextHandle } from "../../instrumentation.js";
import {
buildNativeHeartbeatPreparationSpans,
buildNativeWakeIngressSpan,
createNativeRunTrace,
nativeRunPreparationStarts,
recordFailedSkillPreparation,
recordNativeProviderPerformanceSpans,
NATIVE_RUN_SPAN_EVENT_TYPE,
NATIVE_RUN_TRACE_SCHEMA_VERSION,
} from "./native-run-trace.js";
type RecordedSpan = {
name: string;
parentName: string | null;
attributes: Record<string, unknown>;
endedAtMs: number | null;
};
function createRecordingTraceContext(): {
traceContext: StartupTraceContextHandle;
spans: RecordedSpan[];
} {
const spans: RecordedSpan[] = [];
const spanRecords = new WeakMap<object, RecordedSpan>();
const traceContext: StartupTraceContextHandle = {
tracer: {
startSpan(name, options, context) {
const parent = (context as { span?: RecordedSpan } | undefined)?.span;
const record: RecordedSpan = {
name,
parentName: parent?.name ?? null,
attributes:
(options as { attributes?: Record<string, unknown> } | undefined)
?.attributes ?? {},
endedAtMs: null,
};
spans.push(record);
const span = {
setAttribute(key: string, value: unknown) {
record.attributes[key] = value;
},
setStatus() {},
end(endTime?: unknown) {
record.endedAtMs =
typeof endTime === "number" ? endTime : Date.now();
},
};
spanRecords.set(span, record);
return span;
},
},
contextWithSpan(span) {
return {
span:
typeof span === "object" && span !== null
? spanRecords.get(span)
: undefined,
};
},
};
return { traceContext, spans };
}
describe("native runner performance trace", () => {
it("projects a full durable diagnostic batch without waiting on duplicate run-log writes", async () => {
const {traceContext, spans}=createRecordingTraceContext();
let release!: () => void;
const barrier = new Promise<void>(resolve => { release=resolve; });
const write=vi.fn(async()=>barrier);
const trace=createNativeRunTrace({runId:"provider-perf-blocked-log",startedAtMs:1000,traceContext,onEvent:write});
const names=["provider.model.stream","provider.context.environment","provider.tools.resolve","provider.model.resolve",
"provider.workspace.snapshot.track","provider.workspace.snapshot.patch","provider.workspace.snapshot.diff","provider.skills.discovery"];
let completed=false;
const work=recordNativeProviderPerformanceSpans(trace,Array.from({length:128},(_,index)=>({
name:names[index%names.length],startedAtMs:1100+index,endedAtMs:1200+index,
}))).then(()=>{completed=true;});
try {
await new Promise<void>(resolve=>setImmediate(resolve));
expect(completed).toBe(true);
expect(write).not.toHaveBeenCalled();
expect(spans.filter(span=>span.parentName==="provider.runtime")).toHaveLength(128);
} finally {release();await work;await trace.finish("ok");}
});
it("groups normalized provider phases under their real native execution parent", async () => {
const {traceContext, spans}=createRecordingTraceContext();
const trace=createNativeRunTrace({runId:"provider-perf",startedAtMs:1000,traceContext});
const execute=trace.start("native.session.execute",{startedAtMs:1000});
await recordNativeProviderPerformanceSpans(trace,[
{name:"provider.context.environment",startedAtMs:1100,endedAtMs:1200},
{name:"provider.model.stream",startedAtMs:1200,endedAtMs:1700},
]);
await trace.end(execute,{endedAtMs:1800});
await trace.finish("ok");
expect(spans.find(s=>s.name==="provider.runtime")).toMatchObject({parentName:"native.session.execute",endedAtMs:1700});
expect(spans.filter(s=>s.name==="provider.model.stream"||s.name==="provider.context.environment").map(s=>s.parentName))
.toEqual(["provider.runtime","provider.runtime"]);
});
it.each([7_200_000, 10_800_000])(
"times the current answer after %i ms without charging prior questions or human wait",
async (answeredAtMs) => {
const original = {
id: "original-comment",
createdAt: new Date(1_000).toISOString(),
};
const ingress = buildNativeWakeIngressSpan({
runCreatedAtMs: answeredAtMs + 10,
wakeComments: [original],
attestedQuestionResponseAtMs: answeredAtMs,
});
expect(ingress).toEqual({
name: "question_response.to_run_created",
parentName: "task.provider_session",
startedAtMs: answeredAtMs,
endedAtMs: answeredAtMs + 10,
});
const starts = nativeRunPreparationStarts(
[
ingress!,
...buildNativeHeartbeatPreparationSpans({
runCreatedAtMs: answeredAtMs + 10,
runStartedAtMs: answeredAtMs + 20,
attemptStartedAtMs: answeredAtMs + 30,
environmentAcquireStartedAtMs: answeredAtMs + 40,
environmentRealizeEndedAtMs: answeredAtMs + 50,
nativeDispatchAtMs: answeredAtMs + 60,
}),
],
answeredAtMs + 60,
);
expect(starts).toEqual({
runStartedAtMs: answeredAtMs,
preparationStartedAtMs: answeredAtMs + 30,
});
const events: AdapterRuntimeEvent[] = [];
const trace = createNativeRunTrace({
runId: "answer-run",
startedAtMs: starts.runStartedAtMs,
traceContext: createRecordingTraceContext().traceContext,
onEvent: async (event) => {
events.push(event);
},
});
const clock = vi
.spyOn(Date, "now")
.mockReturnValue(answeredAtMs + 19_000);
try {
await trace.finish("ok");
} finally {
clock.mockRestore();
}
expect(
events.find((event) => event.payload?.span === "task.provider_session.measured")
?.payload,
).toMatchObject({ durationMs: 19_000 });
expect(original.createdAt).toBe(new Date(1_000).toISOString());
},
);
it("preserves ordinary and retry comment ingress and ignores caller answer timestamps", () => {
const wakeComments = [
{ createdAt: new Date(2_000).toISOString(), answeredAtMs: 50_000 },
{ createdAt: "invalid", answeredAtMs: 60_000 },
{
createdAt: new Date(1_000).toISOString(),
externalChatQuestionResponse: { answeredAtMs: 70_000 },
},
];
expect(
buildNativeWakeIngressSpan({
runCreatedAtMs: 3_000,
wakeComments,
attestedQuestionResponseAtMs: null,
}),
).toEqual({
name: "comment.to_run_created",
parentName: "task.provider_session",
startedAtMs: 1_000,
endedAtMs: 3_000,
});
expect(
buildNativeWakeIngressSpan({
runCreatedAtMs: 3_000,
wakeComments: [{ answeredAtMs: 1 }],
attestedQuestionResponseAtMs: null,
}),
).toBeNull();
});
it.each([
{ label: "initial", attemptStartedAtMs: 2_000 },
{ label: "same-run resume after host sleep", attemptStartedAtMs: 985_000 },
])(
"keeps $label preparation attempt-local while retaining run wall time",
async ({ attemptStartedAtMs }) => {
const events: AdapterRuntimeEvent[] = [];
const { traceContext, spans: recordedSpans } =
createRecordingTraceContext();
const historicalSpans = [
{
name: "comment.to_run_created",
startedAtMs: 900,
endedAtMs: 1_000,
},
...buildNativeHeartbeatPreparationSpans({
runCreatedAtMs: 1_000,
runStartedAtMs: 2_000,
attemptStartedAtMs,
environmentAcquireStartedAtMs: attemptStartedAtMs + 20,
environmentRealizeEndedAtMs: attemptStartedAtMs + 30,
nativeDispatchAtMs: attemptStartedAtMs + 40,
}),
];
const beforeEnvironment = historicalSpans.find(
(span) => span.name === "heartbeat.prepare_before_environment",
)!;
expect(beforeEnvironment.endedAtMs - beforeEnvironment.startedAtMs).toBe(
20,
);
expect(
historicalSpans.find((span) => span.name === "heartbeat.queue"),
).toMatchObject({
startedAtMs: 1_000,
endedAtMs: 2_000,
});
const starts = nativeRunPreparationStarts(
historicalSpans,
attemptStartedAtMs + 40,
);
expect(starts).toEqual({
runStartedAtMs: 900,
preparationStartedAtMs: attemptStartedAtMs,
});
const trace = createNativeRunTrace({
runId: "same-run",
startedAtMs: starts.runStartedAtMs,
traceContext,
onEvent: async (event) => {
events.push(event);
},
});
const prepare = trace.start("task.prepare", {
parentName: "task.provider_session",
startedAtMs: starts.preparationStartedAtMs,
});
await trace.end(prepare, { endedAtMs: attemptStartedAtMs + 50 });
const clock = vi
.spyOn(Date, "now")
.mockReturnValue(attemptStartedAtMs + 100);
try {
await trace.finish("ok");
} finally {
clock.mockRestore();
}
expect(
events.find((event) => event.payload?.span === "task.prepare")?.payload,
).toMatchObject({
durationMs: 50,
startOffsetMs: attemptStartedAtMs - 900,
});
expect(recordedSpans[0]?.attributes["paperclip.task.run.wall_ms"]).toBe(
attemptStartedAtMs + 100 - 900,
);
},
);
it("persists measured spans with bounded run-relative timing", async () => {
const events: AdapterRuntimeEvent[] = [];
const trace = createNativeRunTrace({
runId: "run-secret-id",
startedAtMs: 1_000,
onEvent: async (event) => {
events.push(event);
},
});
await trace.record({
name: "runner.transport.selected",
parentName: "runner.session.bootstrap",
startedAtMs: 1_125,
endedAtMs: 1_125,
attributes: {
mode: "direct_loopback",
credential: "must-not-export",
},
});
expect(events).toHaveLength(1);
expect(events[0]).toMatchObject({
eventType: NATIVE_RUN_SPAN_EVENT_TYPE,
stream: "system",
payload: {
schema: "paperclip.run-performance-span.v1",
traceSchemaVersion: NATIVE_RUN_TRACE_SCHEMA_VERSION,
span: "runner.transport.selected",
parentSpan: "task.provider_session",
startOffsetMs: 125,
durationMs: 0,
outcome: "ok",
mode: "direct_loopback",
},
});
expect(events[0]?.payload).not.toHaveProperty("credential");
});
it("records failed measurements without changing the original error", async () => {
const events: AdapterRuntimeEvent[] = [];
const trace = createNativeRunTrace({
runId: "run-1",
onEvent: async (event) => {
events.push(event);
},
});
const failure = new Error("boom");
await expect(
trace.measure("runner.runtime.stage", async () => {
throw failure;
}),
).rejects.toBe(failure);
expect(events).toHaveLength(1);
expect(events[0]).toMatchObject({
eventType: NATIVE_RUN_SPAN_EVENT_TYPE,
level: "warn",
payload: {
span: "runner.runtime.stage",
outcome: "failed",
},
});
});
it("records skills.prepare beneath preparation with no attributes and tolerates a failed log sink", async () => {
const { traceContext, spans } = createRecordingTraceContext();
const trace = createNativeRunTrace({ runId: "skills-run", startedAtMs: 100,
traceContext, onEvent: async () => { throw new Error("run log unavailable"); } });
const preparation = trace.start("task.prepare", { parentName: "task.provider_session", startedAtMs: 100 });
await expect(trace.record({ name: "skills.prepare", parentName: "task.prepare", startedAtMs: 120, endedAtMs: 170 })).resolves.toBeUndefined();
await trace.end(preparation, { endedAtMs: 200 });
expect(spans.find((span) => span.name === "skills.prepare")).toMatchObject({ name: "skills.prepare", parentName: "task.prepare", endedAtMs: 170 });
await expect(trace.finish("ok")).resolves.toBeUndefined();
});
it("emits failed skill preparation without starting execution, even when the log sink fails", async () => {
const events: AdapterRuntimeEvent[] = [];
const { traceContext, spans } = createRecordingTraceContext();
await recordFailedSkillPreparation({ runId: "failed-skills", startedAtMs: Date.now() - 10,
traceContext, onEvent: async (event) => { events.push(event); throw new Error("log unavailable"); } });
expect(events.find((event) => event.payload?.span === "skills.prepare")?.payload).toMatchObject({
span: "skills.prepare", parentSpan: "task.prepare", outcome: "failed",
});
expect(spans.find((span) => span.name === "skills.prepare")?.parentName).toBe("task.prepare");
expect(spans.some((span) => span.name === "native.session.execute")).toBe(false);
});
it("never fails runner control flow when its event sink fails", async () => {
const trace = createNativeRunTrace({
runId: "run-1",
onEvent: vi.fn(async () => {
throw new Error("telemetry unavailable");
}),
});
await expect(
trace.measure("runner.turn.submit", async () => "ok"),
).resolves.toBe("ok");
await expect(trace.finish("ok")).resolves.toBeUndefined();
});
it("creates a foldable canonical hierarchy with real parent contexts", async () => {
const events: AdapterRuntimeEvent[] = [];
const { traceContext, spans } = createRecordingTraceContext();
const trace = createNativeRunTrace({
runId: "run-1",
startedAtMs: 1_000,
traceContext,
onEvent: async (event) => {
events.push(event);
},
});
const prepare = trace.start("task.prepare", {
parentName: "task.provider_session",
startedAtMs: 1_010,
});
const environment = trace.start("environment.startup", {
parentName: "task.prepare",
startedAtMs: 1_020,
});
await trace.record({
name: "environment.acquire",
parentName: "environment.startup",
startedAtMs: 1_025,
endedAtMs: 1_030,
});
await trace.end(environment, { endedAtMs: 1_035 });
await trace.end(prepare, { endedAtMs: 1_040 });
const execute = trace.start("native.session.execute", {
parentName: "task.provider_session",
startedAtMs: 1_050,
});
const startup = trace.start("runner.session.startup", {
parentName: "native.session.execute",
startedAtMs: 1_055,
});
await trace.run(startup, async () => {
await trace.measure("runner.artifact.prepare", () =>
trace.measure("runner.artifact.discover", async () => undefined),
);
await trace.measure("runner.runtime.stage", () =>
trace.measure("stage.sync", async () => {
await trace.measure("stage.asset.home", () =>
trace.measure("session.checkpoint.restore", async () => undefined),
);
await trace.measure(
"stage.asset.runtime_context",
async () => undefined,
);
await trace.measure("stage.asset.ca_bundle", async () => undefined);
}),
);
await trace.end(startup, { endedAtMs: 1_080 });
const agentTurn = trace.start("agent.turn", {
parentName: "native.session.execute",
startedAtMs: 1_085,
});
trace.activate(agentTurn);
expect(
(
getActiveStepContext()?.parentContext as
{ span?: RecordedSpan } | undefined
)?.span?.name,
).toBe("agent.turn");
await trace.measure("provider.dynamic", async () => undefined);
await trace.record({
name: "runner.turn.submitted_to_started",
parentName: "agent.turn",
startedAtMs: 1_085,
endedAtMs: 1_090,
});
await trace.end(agentTurn, { endedAtMs: 1_100 });
});
await trace.end(execute, { endedAtMs: 1_105 });
await trace.finish("ok");
const parentOf = (name: string) =>
spans.find((span) => span.name === name)?.parentName;
expect(parentOf("task.provider_session")).toBeNull();
expect(parentOf("task.prepare")).toBe("task.provider_session");
expect(parentOf("environment.startup")).toBe("task.prepare");
expect(parentOf("environment.acquire")).toBe("environment.startup");
expect(parentOf("native.session.execute")).toBe("task.provider_session");
expect(parentOf("runner.session.startup")).toBe("native.session.execute");
expect(parentOf("runner.artifact.prepare")).toBe("runner.session.startup");
expect(parentOf("runner.artifact.discover")).toBe(
"runner.artifact.prepare",
);
expect(parentOf("runner.runtime.stage")).toBe("runner.session.startup");
expect(parentOf("stage.sync")).toBe("runner.runtime.stage");
expect(parentOf("stage.asset.home")).toBe("stage.sync");
expect(parentOf("session.checkpoint.restore")).toBe("stage.asset.home");
expect(parentOf("stage.asset.runtime_context")).toBe("stage.sync");
expect(parentOf("stage.asset.ca_bundle")).toBe("stage.sync");
expect(parentOf("agent.turn")).toBe("native.session.execute");
expect(parentOf("provider.dynamic")).toBe("agent.turn");
expect(parentOf("runner.turn.submitted_to_started")).toBe("agent.turn");
expect(spans.filter((span) => span.name === "task.provider_session")).toHaveLength(1);
expect(spans.some((span) => span.name === "task.provider_session.measured")).toBe(false);
expect(
events.some((event) => event.payload?.span === "task.provider_session.measured"),
).toBe(true);
});
});
it.each(["start", "context", "attribute", "status", "end"])("keeps execution and cleanup independent of a throwing %s tracer method", async broken => {
const failure = new Error("original private execution failure");
const spans: Array<{ end: ReturnType<typeof vi.fn> }> = [];
const traceContext: StartupTraceContextHandle = {
tracer: { startSpan() {
if (broken === "start") throw new Error("tracer failed");
const span = {
setAttribute() { if (broken === "attribute") throw new Error("attribute failed"); },
setStatus() { if (broken === "status") throw new Error("status failed"); },
end: vi.fn(() => { if (broken === "end") throw new Error("end failed"); }),
};
spans.push(span);
return span;
} },
contextWithSpan() { if (broken === "context") throw new Error("context failed"); return undefined; },
};
const native = createNativeRunTrace({ runId: "throwing-tracer", traceContext });
const result = {}, work = vi.fn(async () => result), failedWork = vi.fn(async () => { throw failure; });
await expect(native.measure("runner.turn.submit", work)).resolves.toBe(result);
await expect(native.measure("agent.turn", failedWork)).rejects.toBe(failure);
await expect(native.finish("failed")).resolves.toBeUndefined();
expect(work).toHaveBeenCalledOnce();
expect(failedWork).toHaveBeenCalledOnce();
for (const span of spans) expect(span.end).toHaveBeenCalledOnce();
});