test: dedupe discord thread starter setup

src/discord/monitor/threading.starter.test.ts

@@ -5,27 +5,37 @@ import {
   resolveDiscordThreadStarter,
 } from "./threading.js";
 
+async function resolveStarter(
+  message: Partial<Awaited<ReturnType<Client["rest"]["get"]>>>,
+  resolveTimestampMs: () => number | undefined,
+) {
+  const get = vi.fn().mockResolvedValue(message);
+  const client = { rest: { get } } as unknown as Client;
+
+  return resolveDiscordThreadStarter({
+    channel: { id: "thread-1" },
+    client,
+    parentId: "parent-1",
+    parentType: ChannelType.GuildText,
+    resolveTimestampMs,
+  });
+}
+
 describe("resolveDiscordThreadStarter", () => {
   beforeEach(() => {
     __resetDiscordThreadStarterCacheForTest();
   });
 
   it("falls back to joined embed title and description when content is empty", async () => {
-    const get = vi.fn().mockResolvedValue({
-      content: "   ",
-      embeds: [{ title: "Alert", description: "Details" }],
-      author: { username: "Alice", discriminator: "0" },
-      timestamp: "2026-02-24T12:00:00.000Z",
-    });
-    const client = { rest: { get } } as unknown as Client;
-
-    const result = await resolveDiscordThreadStarter({
-      channel: { id: "thread-1" },
-      client,
-      parentId: "parent-1",
-      parentType: ChannelType.GuildText,
-      resolveTimestampMs: () => 123,
-    });
+    const result = await resolveStarter(
+      {
+        content: "   ",
+        embeds: [{ title: "Alert", description: "Details" }],
+        author: { username: "Alice", discriminator: "0" },
+        timestamp: "2026-02-24T12:00:00.000Z",
+      },
+      () => 123,
+    );
 
     expect(result).toEqual({
       text: "Alert\nDetails",
@@ -35,20 +45,14 @@ describe("resolveDiscordThreadStarter", () => {
   });
 
   it("prefers starter content over embed fallback text", async () => {
-    const get = vi.fn().mockResolvedValue({
-      content: "starter content",
-      embeds: [{ title: "Alert", description: "Details" }],
-      author: { username: "Alice", discriminator: "0" },
-    });
-    const client = { rest: { get } } as unknown as Client;
-
-    const result = await resolveDiscordThreadStarter({
-      channel: { id: "thread-1" },
-      client,
-      parentId: "parent-1",
-      parentType: ChannelType.GuildText,
-      resolveTimestampMs: () => undefined,
-    });
+    const result = await resolveStarter(
+      {
+        content: "starter content",
+        embeds: [{ title: "Alert", description: "Details" }],
+        author: { username: "Alice", discriminator: "0" },
+      },
+      () => undefined,
+    );
 
     expect(result?.text).toBe("starter content");
   });