import { ThreadId } from "@t3tools/contracts";import { describe, expect, it } from "@effect/vitest"; import {  decodeThreadDetailPageCursor,  encodeThreadDetailPageCursor,} from "./threadDetailCursor.ts"; describe("threadDetailCursor", () => {  it("round-trips a cursor", () => {    const cursor = {      threadId: ThreadId.make("thread-1"),      beforeAnchorAt: "2026-08-01T00:00:00.000Z",      beforeTurnId: "turn-9",    };    expect(decodeThreadDetailPageCursor(encodeThreadDetailPageCursor(cursor))).toEqual(cursor);  });   it("round-trips empty boundary values", () => {    // The anchor is COALESCE(requested_at, started_at, '') and the turn key    // is COALESCE(turn_id, ''), so a server-minted cursor can legitimately    // carry empty strings; rejecting them would degrade a valid cursor to a    // first-page request that repeats recent history (review finding).    const cursor = {      threadId: ThreadId.make("thread-1"),      beforeAnchorAt: "",      beforeTurnId: "",    };    expect(decodeThreadDetailPageCursor(encodeThreadDetailPageCursor(cursor))).toEqual(cursor);  });   it("rejects malformed input", () => {    expect(decodeThreadDetailPageCursor("not-base64-json")).toBeNull();    expect(decodeThreadDetailPageCursor(Buffer.from("[]").toString("base64url"))).toBeNull();    expect(      decodeThreadDetailPageCursor(Buffer.from(JSON.stringify({ t: "" })).toString("base64url")),    ).toBeNull();    expect(      decodeThreadDetailPageCursor(        Buffer.from(JSON.stringify({ t: "thread-1", a: 5, i: "x" })).toString("base64url"),      ),    ).toBeNull();  });});