import type {  PreviewCloseInput,  PreviewSessionSnapshot,  ScopedThreadRef,} from "@t3tools/contracts";import * as Cause from "effect/Cause";import { AsyncResult } from "effect/unstable/reactivity";import { beforeEach, describe, expect, it, vi } from "vite-plus/test"; import {  applyPreviewServerSnapshot,  readThreadPreviewState,  resetPreviewStateForTests,} from "~/previewStateStore"; import { closePreviewSession } from "./closePreviewSession"; const threadRef = {  environmentId: "local" as ScopedThreadRef["environmentId"],  threadId: "thread-1" as ScopedThreadRef["threadId"],}; const snapshot: PreviewSessionSnapshot = {  threadId: threadRef.threadId,  tabId: "tab-1",  navStatus: {    _tag: "Success",    url: "http://localhost:3000/",    title: "Local app",  },  canGoBack: false,  canGoForward: false,  updatedAt: "2026-06-18T19:00:00.000Z",}; beforeEach(resetPreviewStateForTests); describe("closePreviewSession", () => {  it("suppresses stale server snapshots while the close is in flight", async () => {    applyPreviewServerSnapshot(threadRef, snapshot);    let finishClose: (() => void) | undefined;    const closePreview = vi.fn(      (_input: PreviewCloseInput) =>        new Promise<ReturnType<typeof AsyncResult.success<void>>>((resolve) => {          finishClose = () => resolve(AsyncResult.success(undefined));        }),    );     const closing = closePreviewSession({      closePreview: ({ input }) => closePreview(input),      snapshot,      tabId: snapshot.tabId,      threadRef,    });     expect(readThreadPreviewState(threadRef).sessions).toEqual({});    applyPreviewServerSnapshot(threadRef, snapshot);    expect(readThreadPreviewState(threadRef).sessions).toEqual({});     finishClose?.();    await closing;    expect(closePreview).toHaveBeenCalledWith({ threadId: "thread-1", tabId: "tab-1" });  });   it("restores the last snapshot when the server close fails", async () => {    applyPreviewServerSnapshot(threadRef, snapshot);     const result = await closePreviewSession({      closePreview: async () => AsyncResult.failure(Cause.fail(new Error("close failed"))),      snapshot,      tabId: snapshot.tabId,      threadRef,    });     expect(result._tag).toBe("Failure");    expect(readThreadPreviewState(threadRef).snapshot).toEqual(snapshot);    expect(readThreadPreviewState(threadRef).sessions).toEqual({ [snapshot.tabId]: snapshot });  });});