siftlode/frontend/src/components/ui/Toaster.dom.test.tsx

// @vitest-environment jsdom
//
// Which Toaster shows the toasts. The app's own sits in the content column, which is a stacking
// context — so a full-screen player portalled to <body> at the same z painted over every toast: a
// failed Remove raised while watching was drawn under the player's scrim, and clicking it closed
// the player. An overlay mounts its own host, and exactly one host shows the toasts.
import { describe, it, expect, vi, afterEach } from "vitest";
import { render, screen, fireEvent, cleanup, act } from "@testing-library/react";
import { useState } from "react";

vi.mock("react-i18next", async (importOriginal) => {
  const actual = await importOriginal<typeof import("react-i18next")>();
  return { ...actual, useTranslation: () => ({ t: (key: string) => key }) };
});

import Toaster from "./Toaster";
import { clearAll, notify } from "../../lib/notifications";

afterEach(() => {
  cleanup();
  act(() => clearAll());
});

const hosts = () => Array.from(document.querySelectorAll("[aria-live]"));

describe("Toaster — one host shows the toasts", () => {
  it("moves the toasts into an open overlay, and back when it closes", () => {
    const app = render(
      <div data-testid="app">
        <Toaster />
      </div>,
    );
    act(() => void notify({ level: "error", message: "Couldn't remove the video." }));
    expect(screen.getByTestId("app").textContent).toContain("Couldn't remove the video.");

    const overlay = render(
      <div data-testid="overlay">
        <Toaster overlay />
      </div>,
    );
    expect(screen.getByTestId("overlay").textContent).toContain("Couldn't remove the video.");
    expect(screen.getByTestId("app").textContent).not.toContain("Couldn't remove the video.");
    // Both live regions stay mounted — a polite region has to pre-exist to be announced.
    expect(hosts()).toHaveLength(2);
    // The taking-over host arms itself a task later (see the "inherits" test below).
    expect(hosts().map((h) => h.getAttribute("aria-live"))).toEqual(["off", "off"]);

    overlay.unmount();
    expect(screen.getByTestId("app").textContent).toContain("Couldn't remove the video.");
    app.unmount();
  });

  it("does not let a click on a toast reach the overlay's backdrop", () => {
    const backdrop = vi.fn();
    render(
      <div onClick={backdrop}>
        <Toaster overlay />
      </div>,
    );
    act(() => void notify({ level: "error", message: "boom" }));
    fireEvent.click(screen.getByText("boom"));
    expect(backdrop).not.toHaveBeenCalled();
  });
});

describe("Toaster — handing the toasts to another host", () => {
  it("does not announce the toasts it inherits again, only the ones that come after", () => {
    // The new host gets them as NEW nodes: a screen reader read every one out again, an error
    // assertively, each time a player (or any dialog) opened or closed.
    render(<Toaster />);
    act(() => void notify({ level: "error", message: "old news" }));
    render(<Toaster overlay />);
    const old = screen.getByText("old news").closest(".toast-card")!;
    expect(old.getAttribute("role")).toBeNull();
    act(() => void notify({ level: "error", message: "fresh" }));
    expect(screen.getByText("fresh").closest(".toast-card")!.getAttribute("role")).toBe("alert");
  });

  it("keeps its live region off while the inherited toasts go in, and arms it a task later", async () => {
    // The other half of "silently": a region that is already polite when the inherited nodes are
    // inserted announces them anyway. React flushes effects in the SAME task as that render, so the
    // arming has to wait for the next one — a screen reader reads the region's state after the task.
    render(<Toaster />);
    act(() => void notify({ level: "info", message: "saved" }));
    const overlay = render(<Toaster overlay />);
    const region = overlay.container.firstElementChild!;
    expect(region.textContent).toContain("saved"); // it took the toast over…
    expect(region.getAttribute("aria-live")).toBe("off"); // …while still off
    await act(async () => void (await new Promise((r) => setTimeout(r, 0))));
    expect(region.getAttribute("aria-live")).toBe("polite"); // and polite for what comes next
  });

  it("announces a toast RAISED in the same commit as the takeover, and still not the inherited ones", () => {
    // A dialog that notifies and closes in ONE handler (UploadDialog: "added to the queue" + close)
    // puts its toast into the very batch that hands the app host the top spot. Classifying it from
    // the store live at the takeover render counted it among the inherited, so it went in with no
    // role into a region that was still `aria-live="off"` — announced by neither path (round 5).
    function Stage() {
      const [open, setOpen] = useState(true);
      return (
        <>
          <Toaster />
          {open && (
            <>
              <Toaster overlay />
              <button
                onClick={() => {
                  notify({ level: "success", message: "upload queued" });
                  setOpen(false);
                }}
              >
                upload
              </button>
            </>
          )}
        </>
      );
    }
    render(<Stage />);
    act(() => void notify({ level: "error", message: "old news" }));
    fireEvent.click(screen.getByText("upload"));

    const card = (text: string) => screen.getByText(text).closest(".toast-card")!;
    expect(card("upload queued").getAttribute("role")).toBe("status");
    expect(card("old news").getAttribute("role")).toBeNull();
  });

  it("ranks hosts by when their OVERLAY opened, not by when the host mounted", async () => {
    // PlayerModal's host moves into the fullscreen stage and back: remounted, it used to jump over a
    // dialog opened above the player, and the toasts went back under that dialog's scrim.
    const player = render(
      <div data-testid="player">
        <Toaster overlay order={1} />
      </div>,
    );
    render(
      <div data-testid="dialog">
        <Toaster overlay order={2} />
      </div>,
    );
    act(() => void notify({ level: "error", message: "boom" }));
    expect(screen.getByTestId("dialog").textContent).toContain("boom");
    // The player swaps its host (leaving true fullscreen) while the dialog stays open.
    player.rerender(
      <div data-testid="player">
        <span />
        <Toaster overlay order={1} />
      </div>,
    );
    await act(async () => void (await new Promise((r) => setTimeout(r, 0))));
    expect(screen.getByTestId("dialog").textContent).toContain("boom");
    expect(screen.getByTestId("player").textContent).not.toContain("boom");
  });

  it("keeps the countdown where it was, instead of starting it again from full", () => {
    // The bar is a CSS animation on the node; the dismiss timer was armed once, at notify time. A
    // new node restarted the bar, and the toast vanished with it still two-thirds full.
    const t0 = Date.now();
    const now = vi.spyOn(Date, "now").mockReturnValue(t0);
    render(<Toaster />);
    act(() => void notify({ level: "info", message: "saved" }));
    now.mockReturnValue(t0 + 4000);
    render(<Toaster overlay />);
    const bar = screen.getByText("saved").closest(".toast-card")!.lastElementChild as HTMLElement;
    expect(bar.style.animation).toContain("-4000ms");
  });

  it("keeps the players' control band free inside an overlay", () => {
    // At the app's own spot (bottom-4) the stack sat on the Plex transport row and PlayerModal's
    // docked bar, above them at z-overlay, and took their clicks for as long as a toast was up.
    render(<Toaster overlay />);
    act(() => void notify({ level: "error", message: "boom" }));
    const host = hosts()[0]!;
    expect(host.className).toContain("bottom-24");
    expect(host.className).toContain("pointer-events-none");
    expect(screen.getByText("boom").closest(".toast-card")!.className).toContain(
      "pointer-events-auto",
    );
  });
});