import { afterEach, beforeEach, describe, expect, it, vi } from "vite-plus/test"; import { showBootError } from "./lib/bootError"; class BootElement extends EventTarget {  children: BootElement[] = [];  textContent = "";   constructor(readonly tagName: string) {    super();  }   setAttribute() {}   append(child: BootElement) {    this.children.push(child);  }   replaceChildren(...children: BootElement[]) {    this.children = children;  }   get text(): string {    return this.textContent + this.children.map((child) => child.text).join(" ");  }} describe("app startup failures", () => {  let bootShell: BootElement | null;   beforeEach(() => {    vi.resetModules();    bootShell = new BootElement("div");    vi.stubGlobal("document", {      getElementById: () => bootShell,      createElement: (tagName: string) => new BootElement(tagName),    });    vi.spyOn(console, "error").mockImplementation(() => {});  });   it("shows failures from asynchronous app startup", async () => {    vi.doMock("./main", () => ({ startup: Promise.reject(new Error("Startup chunks failed")) }));     await import("./bootstrap");    await vi.dynamicImportSettled();     expect(bootShell?.text).toContain("Startup chunks failed");  });   afterEach(() => {    vi.doUnmock("./main");    vi.unstubAllGlobals();    vi.unstubAllEnvs();    vi.restoreAllMocks();  });   it("replaces the splash when an app import throws before main can run", async () => {    vi.doMock("./main", () => {      throw new Error("@vitejs/plugin-react can't detect preamble. Something is wrong.");    });    const reload = vi.fn();    vi.stubGlobal("window", { location: { reload } });     await import("./bootstrap");    await vi.dynamicImportSettled();     expect(bootShell?.text).toContain("T3 Code could not load.");    const reloadButton = bootShell?.children[0]?.children.find(      (element) => element.tagName === "button",    );    expect(reloadButton?.text).toBe("Reload");    reloadButton?.dispatchEvent(new Event("click"));    expect(reload).toHaveBeenCalledOnce();  });   it.each([true, false])("shows startup error details only in dev mode, DEV=%s", (dev) => {    vi.stubEnv("DEV", dev);     showBootError(new Error("internal module path"));     expect(bootShell?.text).toContain("T3 Code could not load.");    expect(bootShell?.text.includes("internal module path")).toBe(dev);  });   it("does not replace the app after React removes the splash", () => {    bootShell = null;    const createElement = vi.spyOn(document, "createElement");     showBootError(new Error("late failure"));     expect(createElement).not.toHaveBeenCalled();  });});