refactor(test): share web broadcast-groups harness

src/web/auto-reply.broadcast-groups.test-harness.ts

@@ -0,0 +1,22 @@
+import type { WebInboundMessage } from "./inbound.js";
+import { monitorWebChannel } from "./auto-reply.js";
+import {
+  createWebInboundDeliverySpies,
+  createWebListenerFactoryCapture,
+} from "./auto-reply.test-harness.js";
+
+export async function monitorWebChannelWithCapture(resolver: unknown): Promise<{
+  spies: ReturnType<typeof createWebInboundDeliverySpies>;
+  onMessage: (msg: WebInboundMessage) => Promise<void>;
+}> {
+  const spies = createWebInboundDeliverySpies();
+  const { listenerFactory, getOnMessage } = createWebListenerFactoryCapture();
+
+  await monitorWebChannel(false, listenerFactory, false, resolver as never);
+  const onMessage = getOnMessage();
+  if (!onMessage) {
+    throw new Error("Missing onMessage handler");
+  }
+
+  return { spies, onMessage };
+}