frontend-svelte/vitest.setup.jsdom.ts

import { vi } from 'vitest';

// jsdom lacks ResizeObserver
global.ResizeObserver = class {
    observe = vi.fn();
    unobserve = vi.fn();
    disconnect = vi.fn();
} as unknown as typeof ResizeObserver;

// jsdom lacks Web Animations API
Element.prototype.animate = vi.fn().mockReturnValue({
    onfinish: null,
    cancel: vi.fn(),
    finish: vi.fn(),
    pause: vi.fn(),
    play: vi.fn(),
});

// jsdom lacks SVG geometry methods
(SVGElement.prototype as any).getTotalLength = vi.fn(() => 0);

// Robust localStorage mock for jsdom environment
const localStorageMock = (() => {
    let store: Record<string, string> = {};
    return {
        getItem: vi.fn((key: string) => store[key] || null),
        setItem: vi.fn((key: string, value: string) => {
            store[key] = value.toString();
        }),
        removeItem: vi.fn((key: string) => {
            delete store[key];
        }),
        clear: vi.fn(() => {
            store = {};
        }),
        key: vi.fn((index: number) => Object.keys(store)[index] || null),
        get length() {
            return Object.keys(store).length;
        },
    };
})();

Object.defineProperty(window, 'localStorage', {
    value: localStorageMock,
    writable: true,
});

// jsdom lacks PointerEvent; back it with MouseEvent so clientX/clientY survive.
if (typeof PointerEvent === 'undefined') {
    class PointerEventPolyfill extends MouseEvent {
        pointerId: number;
        constructor(type: string, params: PointerEventInit = {}) {
            super(type, params);
            this.pointerId = params.pointerId ?? 1;
        }
    }
    // @ts-expect-error assigning polyfill to the global scope
    global.PointerEvent = PointerEventPolyfill;
}

// jsdom lacks pointer capture
HTMLElement.prototype.setPointerCapture = vi.fn();
HTMLElement.prototype.releasePointerCapture = vi.fn();