32 lines
720 B
TypeScript
32 lines
720 B
TypeScript
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import { it, expect, vi, beforeEach } from 'vitest';
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import { useVirtualWindow } from './useVirtualWindow.svelte';
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beforeEach(() => {
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vi.stubGlobal(
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'ResizeObserver',
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class {
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observe() {}
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unobserve() {}
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disconnect() {}
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}
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);
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vi.stubGlobal('requestAnimationFrame', (cb: FrameRequestCallback) => {
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cb(0);
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return 0;
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});
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});
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it('starts at zero, observes a root, remeasures, and tears down', () => {
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const vw = useVirtualWindow();
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expect(vw.aboveBy).toBe(0);
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expect(vw.viewportH).toBe(0);
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const root = document.createElement('div');
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document.body.appendChild(root);
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const teardown = vw.observe(root);
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expect(typeof teardown).toBe('function');
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vw.remeasure();
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teardown();
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root.remove();
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});
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