import { isValidElement, type ReactElement, type ReactNode } from "react";import { beforeEach, describe, expect, it, vi } from "vite-plus/test";import type { DesktopUpdateState } from "@t3tools/contracts"; const testState = vi.hoisted(() => ({  addToast: vi.fn(),})); vi.mock("./ui/toast", () => ({  toastManager: { add: testState.addToast },})); import { showDesktopUpdateDownloadedToast } from "./desktopUpdate.toast"; type ClickableElement = ReactElement<{ readonly onClick?: () => void }>; /** Walks the rendered description, invoking function components, to find the link button. */function findReleaseNotesLink(node: ReactNode): ClickableElement | null {  if (Array.isArray(node)) {    for (const child of node) {      const found = findReleaseNotesLink(child);      if (found) return found;    }    return null;  }  if (!isValidElement(node)) return null;  const element = node as ReactElement<{ readonly children?: ReactNode }>;  if (element.type === "button") return element as ClickableElement;  if (typeof element.type === "function") {    const render = element.type as (props: unknown) => ReactNode;    return findReleaseNotesLink(render(element.props));  }  return findReleaseNotesLink(element.props.children);} function getDescription(): ReactNode {  const toast = testState.addToast.mock.calls[0]?.[0] as { description?: ReactNode } | undefined;  return toast?.description ?? null;} function downloadedState(overrides: Partial<DesktopUpdateState> = {}): DesktopUpdateState {  return {    enabled: true,    status: "downloaded",    channel: "latest",    currentVersion: "0.0.29",    hostArch: "arm64",    appArch: "arm64",    runningUnderArm64Translation: false,    availableVersion: "0.0.30",    downloadedVersion: "0.0.30",    releaseNotes: [],    omittedReleaseCount: 0,    downloadPercent: 100,    checkedAt: null,    message: null,    errorContext: null,    canRetry: true,    ...overrides,  };} describe("showDesktopUpdateDownloadedToast", () => {  beforeEach(() => {    testState.addToast.mockReset();  });   it("opens the downloaded version's release notes", async () => {    const openExternal = vi.fn().mockResolvedValue(true);     showDesktopUpdateDownloadedToast({ openExternal }, downloadedState());    const link = findReleaseNotesLink(getDescription());    link?.props.onClick?.();    await vi.waitFor(() => {      expect(openExternal).toHaveBeenCalledWith(        "https://github.com/pingdotgg/t3code/releases/tag/v0.0.30",      );    });    expect(testState.addToast).toHaveBeenCalledTimes(1);  });   it("falls back to the version the download was started for", async () => {    const openExternal = vi.fn().mockResolvedValue(true);     // The `update-downloaded` event can land after the download RPC resolves.    showDesktopUpdateDownloadedToast(      { openExternal },      downloadedState({ downloadedVersion: null }),    );    findReleaseNotesLink(getDescription())?.props.onClick?.();     await vi.waitFor(() => {      expect(openExternal).toHaveBeenCalledWith(        "https://github.com/pingdotgg/t3code/releases/tag/v0.0.30",      );    });  });   it("omits the link when the updater reports no version at all", () => {    showDesktopUpdateDownloadedToast(      { openExternal: vi.fn() },      downloadedState({ availableVersion: null, downloadedVersion: null }),    );     expect(findReleaseNotesLink(getDescription())).toBeNull();  });   it.each([    ["returns false", vi.fn().mockResolvedValue(false)],    ["rejects", vi.fn().mockRejectedValue(new Error("open failed"))],  ])("shows an error when opening release notes %s", async (_description, openExternal) => {    showDesktopUpdateDownloadedToast({ openExternal }, downloadedState());    findReleaseNotesLink(getDescription())?.props.onClick?.();     await vi.waitFor(() => {      expect(testState.addToast).toHaveBeenLastCalledWith({        type: "error",        title: "Unable to open release notes",      });    });  });});