51 lines
2.4 KiB
TypeScript
51 lines
2.4 KiB
TypeScript
import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
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import { pollVisible } from '../../src/lib/ui/poll.js';
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let documentStub: EventTarget & { visibilityState: string };
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let stop: (() => void) | undefined;
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beforeEach(() => {
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vi.useFakeTimers();
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documentStub = Object.assign(new EventTarget(), { visibilityState: 'visible' });
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vi.stubGlobal('document', documentStub);
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});
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afterEach(() => { stop?.(); stop = undefined; vi.useRealTimers(); vi.unstubAllGlobals(); vi.restoreAllMocks(); });
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const visibility = (state: string) => { documentStub.visibilityState = state; documentStub.dispatchEvent(new Event('visibilitychange')); };
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describe('visible page polling', () => {
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it('waits for a request to finish before scheduling the next request', async () => {
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let finish!: () => void;
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const task = vi.fn(() => new Promise<void>(resolve => { finish = resolve; }));
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stop = pollVisible(task, 1000);
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await vi.advanceTimersByTimeAsync(5000);
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visibility('visible');
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expect(task).toHaveBeenCalledTimes(1);
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finish(); await vi.advanceTimersByTimeAsync(999);
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expect(task).toHaveBeenCalledTimes(1);
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await vi.advanceTimersByTimeAsync(1);
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expect(task).toHaveBeenCalledTimes(2);
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});
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it('pauses when hidden and refreshes on return, including hiding during a request', async () => {
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let finish!: () => void;
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const task = vi.fn(() => new Promise<void>(resolve => { finish = resolve; }));
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stop = pollVisible(task, 1000);
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visibility('hidden'); finish();
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await vi.advanceTimersByTimeAsync(5000);
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expect(task).toHaveBeenCalledTimes(1);
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visibility('visible');
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expect(task).toHaveBeenCalledTimes(2);
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finish(); stop();
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visibility('visible'); await vi.advanceTimersByTimeAsync(5000);
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expect(task).toHaveBeenCalledTimes(2);
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});
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it('recovers after a failed request and supports a delayed initial refresh', async () => {
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vi.spyOn(console, 'error').mockImplementation(() => {});
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const task = vi.fn().mockRejectedValueOnce(new Error('offline')).mockResolvedValue(undefined);
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stop = pollVisible(task, 1000, false);
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expect(task).not.toHaveBeenCalled();
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await vi.advanceTimersByTimeAsync(2000);
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expect(task).toHaveBeenCalledTimes(1);
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await vi.advanceTimersByTimeAsync(1000);
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expect(task).toHaveBeenCalledTimes(2);
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});
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});
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