import { describe, expect, it } from "vite-plus/test"; import { sortThreads, type ThreadSortInput } from "./threadSort.ts"; type TestThread = { readonly id: string } & ThreadSortInput; function makeThread(overrides: Partial<TestThread> = {}): TestThread {  return {    id: "thread-1",    createdAt: "2026-03-09T10:00:00.000Z",    updatedAt: "2026-03-09T10:00:00.000Z",    messages: [],    latestUserMessageAt: null,    ...overrides,  };} describe("sortThreads", () => {  it("falls back to updatedAt and createdAt when latestUserMessageAt is invalid and there are no messages", () => {    const sorted = sortThreads(      [        makeThread({          id: "thread-1",          latestUserMessageAt: "not-a-date",          createdAt: "2026-03-09T10:00:00.000Z",          updatedAt: "2026-03-09T10:05:00.000Z",        }),        makeThread({          id: "thread-2",          latestUserMessageAt: "still-not-a-date",          createdAt: "invalid-created-at",          updatedAt: "invalid-updated-at",        }),        makeThread({          id: "thread-3",          latestUserMessageAt: "invalid-latest-user-message-at",          createdAt: "2026-03-09T10:06:00.000Z",          updatedAt: "invalid-updated-at",        }),      ],      "updated_at",    );     expect(sorted.map((thread) => thread.id)).toEqual(["thread-3", "thread-1", "thread-2"]);  });   it("falls back to the latest valid user message when latestUserMessageAt is invalid", () => {    const sorted = sortThreads(      [        makeThread({          id: "thread-1",          latestUserMessageAt: "invalid-latest-user-message-at",          updatedAt: "2026-03-09T10:00:00.000Z",          messages: [            { role: "user", createdAt: "2026-03-09T10:05:00.000Z" },            { role: "assistant", createdAt: "2026-03-09T10:30:00.000Z" },            { role: "user", createdAt: "2026-03-09T10:20:00.000Z" },          ],        }),        makeThread({          id: "thread-2",          createdAt: "2026-03-09T10:15:00.000Z",          updatedAt: "2026-03-09T10:15:00.000Z",        }),      ],      "updated_at",    );     expect(sorted.map((thread) => thread.id)).toEqual(["thread-1", "thread-2"]);  });});