fix: add start thread unit test

testss/channels/threads/startThread.test.ts

@@ -0,0 +1,20 @@
+import { assertEquals, assertExists, assertNotEquals } from "../../deps.ts";
+import { loadBot } from "../../mod.ts";
+import { CACHED_COMMUNITY_GUILD_ID } from "../../utils.ts";
+
+Deno.test("[thread] Start a thread", async (t) => {
+  const bot = loadBot();
+  const channel = await bot.helpers.createChannel(CACHED_COMMUNITY_GUILD_ID, { name: "threads" });
+  const message = await bot.helpers.sendMessage(channel.id, { content: "thread message" });
+  const thread = await bot.helpers.startThreadWithMessage(channel.id, message.id, {
+    reason: "idk",
+    rateLimitPerUser: 5,
+    name: "tread carefully",
+    autoArchiveDuration: 60,
+  });
+
+  assertExists(thread);
+
+  await bot.helpers.deleteChannel(channel.id)
+  
+});