test(cron): improve fire-and-forget harness coverage

src/cron/service.every-jobs-fire.test.ts

@@ -1,5 +1,3 @@
-import fs from "node:fs/promises";
-import path from "node:path";
 import { describe, expect, it, vi } from "vitest";
 import { CronService } from "./service.js";
 import {
@@ -7,6 +5,7 @@ import {
   createCronStoreHarness,
   createNoopLogger,
   installCronTestHooks,
+  writeCronStoreSnapshot,
 } from "./service.test-harness.js";
 
 const noopLogger = createNoopLogger();
@@ -120,12 +119,8 @@ describe("CronService interval/cron jobs fire on time", () => {
     const requestHeartbeatNow = vi.fn();
     const nowMs = Date.parse("2025-12-13T00:00:00.000Z");
 
-    await fs.mkdir(path.dirname(store.storePath), { recursive: true });
+    await writeCronStoreSnapshot({
-    await fs.writeFile(
+      storePath: store.storePath,
-      store.storePath,
-      JSON.stringify(
-        {
-          version: 1,
       jobs: [
         {
           id: "legacy-every",
@@ -152,12 +147,7 @@ describe("CronService interval/cron jobs fire on time", () => {
           state: { nextRunAtMs: nowMs + 60_000 },
         },
       ],
-        },
+    });
-        null,
-        2,
-      ),
-      "utf-8",
-    );
 
     const cron = new CronService({
       storePath: store.storePath,

src/cron/service.read-ops-nonblocking.test.ts

@@ -3,6 +3,7 @@ import os from "node:os";
 import path from "node:path";
 import { describe, expect, it, vi } from "vitest";
 import { CronService } from "./service.js";
+import { writeCronStoreSnapshot } from "./service.test-harness.js";
 
 const noopLogger = {
   debug: vi.fn(),
@@ -167,11 +168,8 @@ describe("CronService read ops while job is running", () => {
     const requestHeartbeatNow = vi.fn();
     const nowMs = Date.parse("2025-12-13T00:00:00.000Z");
 
-    await fs.mkdir(path.dirname(store.storePath), { recursive: true });
+    await writeCronStoreSnapshot({
-    await fs.writeFile(
+      storePath: store.storePath,
-      store.storePath,
-      JSON.stringify({
-        version: 1,
       jobs: [
         {
           id: "startup-catchup",
@@ -187,9 +185,7 @@ describe("CronService read ops while job is running", () => {
           state: { nextRunAtMs: nowMs - 60_000 },
         },
       ],
-      }),
+    });
-      "utf-8",
-    );
 
     const isolatedRun = createDeferredIsolatedRun();
 

src/cron/service.test-harness.ts

@@ -51,6 +51,22 @@ export function createCronStoreHarness(options?: { prefix?: string }) {
   return { makeStorePath };
 }
 
+export async function writeCronStoreSnapshot(params: { storePath: string; jobs: CronJob[] }) {
+  await fs.mkdir(path.dirname(params.storePath), { recursive: true });
+  await fs.writeFile(
+    params.storePath,
+    JSON.stringify(
+      {
+        version: 1,
+        jobs: params.jobs,
+      },
+      null,
+      2,
+    ),
+    "utf-8",
+  );
+}
+
 export function installCronTestHooks(options: {
   logger: ReturnType<typeof createNoopLogger>;
   baseTimeIso?: string;