test: add fetch mock helper and reaction coverage

src/telegram/bot.test.ts

@@ -1001,6 +1001,44 @@ describe("createTelegramBot", () => {
     expect(enqueueSystemEventSpy).not.toHaveBeenCalled();
   });
 
+  it("enqueues one event per added emoji reaction", async () => {
+    onSpy.mockReset();
+    enqueueSystemEventSpy.mockReset();
+
+    loadConfig.mockReturnValue({
+      channels: {
+        telegram: { dmPolicy: "open", reactionNotifications: "all" },
+      },
+    });
+
+    createTelegramBot({ token: "tok" });
+    const handler = getOnHandler("message_reaction") as (
+      ctx: Record<string, unknown>,
+    ) => Promise<void>;
+
+    await handler({
+      update: { update_id: 505 },
+      messageReaction: {
+        chat: { id: 1234, type: "private" },
+        message_id: 42,
+        user: { id: 9, first_name: "Ada" },
+        date: 1736380800,
+        old_reaction: [{ type: "emoji", emoji: "👍" }],
+        new_reaction: [
+          { type: "emoji", emoji: "👍" },
+          { type: "emoji", emoji: "🔥" },
+          { type: "emoji", emoji: "🎉" },
+        ],
+      },
+    });
+
+    expect(enqueueSystemEventSpy).toHaveBeenCalledTimes(2);
+    expect(enqueueSystemEventSpy.mock.calls.map((call) => call[0])).toEqual([
+      "Telegram reaction added: 🔥 by Ada on msg 42",
+      "Telegram reaction added: 🎉 by Ada on msg 42",
+    ]);
+  });
+
   it("routes forum group reactions to the general topic (thread id not available on reactions)", async () => {
     onSpy.mockReset();
     enqueueSystemEventSpy.mockReset();

src/telegram/probe.test.ts

@@ -1,4 +1,5 @@
 import { type Mock, describe, expect, it, vi, beforeEach, afterEach } from "vitest";
+import { withFetchPreconnect } from "../test-utils/fetch-mock.js";
 import { probeTelegram } from "./probe.js";
 
 describe("probeTelegram retry logic", () => {
@@ -38,7 +39,7 @@ describe("probeTelegram retry logic", () => {
   beforeEach(() => {
     vi.useFakeTimers();
     fetchMock = vi.fn();
-    global.fetch = fetchMock;
+    global.fetch = withFetchPreconnect(fetchMock);
   });
 
   afterEach(() => {