73 lines
2.3 KiB
TypeScript
73 lines
2.3 KiB
TypeScript
 
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import { afterEach, test } from 'node:test';
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import assert from 'node:assert/strict';
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import { canCopyImage, copyImageFromUrl, toPngBlob } from './copyImage';
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const g = globalThis as Record<string, unknown>;
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const saved = {
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ClipboardItem: Object.getOwnPropertyDescriptor(g, 'ClipboardItem'),
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navigator: Object.getOwnPropertyDescriptor(g, 'navigator'),
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fetch: Object.getOwnPropertyDescriptor(g, 'fetch'),
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};
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const stub = (key: keyof typeof saved, value: unknown) =>
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Object.defineProperty(g, key, { value, configurable: true, writable: true });
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afterEach(() => {
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(Object.keys(saved) as (keyof typeof saved)[]).forEach((key) => {
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const desc = saved[key];
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if (desc) Object.defineProperty(g, key, desc);
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else delete g[key];
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});
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});
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class FakeClipboardItem {
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constructor(public data: Record<string, Promise<Blob>>) {}
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}
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test('canCopyImage is false without ClipboardItem', () => {
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stub('ClipboardItem', undefined);
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assert.equal(canCopyImage(), false);
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});
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test('canCopyImage is true with ClipboardItem and clipboard.write', () => {
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stub('ClipboardItem', FakeClipboardItem);
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stub('navigator', { clipboard: { write: async () => undefined } });
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assert.equal(canCopyImage(), true);
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});
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test('toPngBlob passes a PNG through untouched', async () => {
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const png = new Blob(['x'], { type: 'image/png' });
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assert.equal(await toPngBlob(png), png);
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});
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test('copyImageFromUrl writes a single image/png item', async () => {
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const png = new Blob(['x'], { type: 'image/png' });
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stub('fetch', async () => ({ ok: true, blob: async () => png }));
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stub('ClipboardItem', FakeClipboardItem);
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const written: FakeClipboardItem[][] = [];
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stub('navigator', {
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clipboard: {
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write: async (items: FakeClipboardItem[]) => {
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written.push(items);
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},
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},
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});
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await copyImageFromUrl('blob:x');
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assert.equal(written.length, 1);
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assert.deepEqual(Object.keys(written[0][0].data), ['image/png']);
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assert.equal(await written[0][0].data['image/png'], png);
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});
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test('copyImageFromUrl rejects when the fetch fails', async () => {
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stub('fetch', async () => ({ ok: false, status: 404 }));
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stub('ClipboardItem', FakeClipboardItem);
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stub('navigator', {
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clipboard: {
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write: async (items: FakeClipboardItem[]) => {
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await items[0].data['image/png'];
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},
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},
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});
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await assert.rejects(copyImageFromUrl('blob:x'), /404/);
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});
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