fix(POSTV1-05): 修复生成请求与 Worker 重入

tests/worker/postv1-generation-polling-loop.test.ts

@@ -0,0 +1,28 @@
+import { afterEach, describe, expect, it, vi } from "vitest";
+
+import { GenerationPollingLoop } from "../../apps/worker/src/generation-polling-loop.js";
+
+describe("POSTV1-05 generation polling loop", () => {
+  afterEach(() => {
+    vi.useRealTimers();
+  });
+
+  it("does not start another processor call while the current call is unresolved", async () => {
+    vi.useFakeTimers();
+    let finishCurrentCall: (() => void) | undefined;
+    const processNext = vi.fn(() => new Promise<void>((resolve) => {
+      finishCurrentCall = resolve;
+    }));
+    const loop = new GenerationPollingLoop({ processNext }, 250);
+
+    await vi.advanceTimersByTimeAsync(1_000);
+    expect(processNext).toHaveBeenCalledTimes(1);
+
+    finishCurrentCall?.();
+    await Promise.resolve();
+    await vi.advanceTimersByTimeAsync(250);
+    expect(processNext).toHaveBeenCalledTimes(2);
+
+    loop.close();
+  });
+});