diff --git a/src/infra/heartbeat-runner.cron-system-event-filter.test.ts b/src/infra/heartbeat-runner.cron-system-event-filter.test.ts
deleted file mode 100644
index dfe4c2c18..000000000
--- a/src/infra/heartbeat-runner.cron-system-event-filter.test.ts
+++ /dev/null
@@ -1,31 +0,0 @@
-import { describe, expect, it } from "vitest";
-import { isCronSystemEvent } from "./heartbeat-runner.js";
-
-describe("isCronSystemEvent", () => {
-  it("returns false for empty entries", () => {
-    expect(isCronSystemEvent("")).toBe(false);
-    expect(isCronSystemEvent("   ")).toBe(false);
-  });
-
-  it("returns false for heartbeat ack markers", () => {
-    expect(isCronSystemEvent("HEARTBEAT_OK")).toBe(false);
-    expect(isCronSystemEvent("HEARTBEAT_OK 🦞")).toBe(false);
-    expect(isCronSystemEvent("heartbeat_ok")).toBe(false);
-    expect(isCronSystemEvent("HEARTBEAT_OK:")).toBe(false);
-    expect(isCronSystemEvent("HEARTBEAT_OK, continue")).toBe(false);
-  });
-
-  it("returns false for heartbeat poll and wake noise", () => {
-    expect(isCronSystemEvent("heartbeat poll: pending")).toBe(false);
-    expect(isCronSystemEvent("heartbeat wake complete")).toBe(false);
-  });
-
-  it("returns false for exec completion events", () => {
-    expect(isCronSystemEvent("Exec finished (gateway id=abc, code 0)")).toBe(false);
-  });
-
-  it("returns true for real cron reminder content", () => {
-    expect(isCronSystemEvent("Reminder: Check Base Scout results")).toBe(true);
-    expect(isCronSystemEvent("Send weekly status update to the team")).toBe(true);
-  });
-});
diff --git a/src/infra/system-events.test.ts b/src/infra/system-events.test.ts
index 03a39cd9e..9175d45c7 100644
--- a/src/infra/system-events.test.ts
+++ b/src/infra/system-events.test.ts
@@ -2,6 +2,7 @@ import { beforeEach, describe, expect, it } from "vitest";
 import type { OpenClawConfig } from "../config/config.js";
 import { prependSystemEvents } from "../auto-reply/reply/session-updates.js";
 import { resolveMainSessionKey } from "../config/sessions.js";
+import { isCronSystemEvent } from "./heartbeat-runner.js";
 import { enqueueSystemEvent, peekSystemEvents, resetSystemEventsForTest } from "./system-events.js";
 
 const cfg = {} as unknown as OpenClawConfig;
@@ -46,3 +47,32 @@ describe("system events (session routing)", () => {
     expect(() => enqueueSystemEvent("Node: Mac Studio", { sessionKey: " " })).toThrow("sessionKey");
   });
 });
+
+describe("isCronSystemEvent", () => {
+  it("returns false for empty entries", () => {
+    expect(isCronSystemEvent("")).toBe(false);
+    expect(isCronSystemEvent("   ")).toBe(false);
+  });
+
+  it("returns false for heartbeat ack markers", () => {
+    expect(isCronSystemEvent("HEARTBEAT_OK")).toBe(false);
+    expect(isCronSystemEvent("HEARTBEAT_OK 🦞")).toBe(false);
+    expect(isCronSystemEvent("heartbeat_ok")).toBe(false);
+    expect(isCronSystemEvent("HEARTBEAT_OK:")).toBe(false);
+    expect(isCronSystemEvent("HEARTBEAT_OK, continue")).toBe(false);
+  });
+
+  it("returns false for heartbeat poll and wake noise", () => {
+    expect(isCronSystemEvent("heartbeat poll: pending")).toBe(false);
+    expect(isCronSystemEvent("heartbeat wake complete")).toBe(false);
+  });
+
+  it("returns false for exec completion events", () => {
+    expect(isCronSystemEvent("Exec finished (gateway id=abc, code 0)")).toBe(false);
+  });
+
+  it("returns true for real cron reminder content", () => {
+    expect(isCronSystemEvent("Reminder: Check Base Scout results")).toBe(true);
+    expect(isCronSystemEvent("Send weekly status update to the team")).toBe(true);
+  });
+});