Evandro Fonseca Junior
6ac87824f3
Legenda do mergulho até Projetos cobrir a cena; transição de página sem blur e com fundo escuro; foco no conteúdo ao trocar de página; listas com marcador e dois pesos de título; vídeos da SEV e da SC Plus regravados sem quadros brancos; scrub a 12-15 fps (-30%); vitrine com uma parada de Tab e setas, contador no celular e CSS sob demanda; âncoras num módulo só (fragment-nav); FramePulse com setInterval; CSS morto removido.
66 lines
2.0 KiB
TypeScript
66 lines
2.0 KiB
TypeScript
import { render, screen } from "@testing-library/react";
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import {
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resetFocusOnNavigation,
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useFocusOnNavigation,
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} from "./useFocusOnNavigation";
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function Probe({ pathname }: { pathname: string }) {
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useFocusOnNavigation(pathname);
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return null;
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}
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beforeEach(() => {
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resetFocusOnNavigation();
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document.body.innerHTML = "";
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});
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function mountMain() {
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const main = document.createElement("div");
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main.id = "main-content";
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main.tabIndex = -1;
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document.body.append(main);
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return main;
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}
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describe("useFocusOnNavigation", () => {
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it("does nothing on the first load, even with #main-content on the page", () => {
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const main = mountMain();
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render(<Probe pathname="/" />);
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expect(main).not.toHaveFocus();
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});
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it("focuses #main-content once per path change, never scrolling", () => {
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const main = mountMain();
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const focus = jest.spyOn(main, "focus");
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const { rerender } = render(<Probe pathname="/" />);
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rerender(<Probe pathname="/cases" />);
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expect(main).toHaveFocus();
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expect(focus).toHaveBeenCalledTimes(1);
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expect(focus).toHaveBeenCalledWith({ preventScroll: true });
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rerender(<Probe pathname="/cases" />);
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expect(focus).toHaveBeenCalledTimes(1);
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});
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it("still tells a navigation from the first load when the component remounts (first segment changed)", () => {
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const main = mountMain();
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const first = render(<Probe pathname="/" />);
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first.unmount();
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render(<Probe pathname="/cases" />);
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expect(main).toHaveFocus();
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});
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it("survives a page without #main-content (a 404 shell, an error boundary)", () => {
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const { rerender } = render(<Probe pathname="/" />);
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expect(() => rerender(<Probe pathname="/nada" />)).not.toThrow();
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expect(screen.queryByRole("main")).toBeNull();
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});
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it("is not fooled by the double effect of React StrictMode", () => {
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const main = mountMain();
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render(<Probe pathname="/" />, { reactStrictMode: true });
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expect(main).not.toHaveFocus();
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});
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});
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