Uint8Array migration

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Fedor Indutny 2021-09-23 17:49:05 -07:00 committed by GitHub
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// Copyright 2021 Signal Messenger, LLC
// SPDX-License-Identifier: AGPL-3.0-only
import { assert } from 'chai';
import { IMAGE_JPEG, IMAGE_PNG } from '../../types/MIME';
import { sniffImageMimeType } from '../../util/sniffImageMimeType';
import { canvasToBytes } from '../../util/canvasToBytes';
describe('canvasToBytes', () => {
let canvas: HTMLCanvasElement;
beforeEach(() => {
canvas = document.createElement('canvas');
canvas.width = 100;
canvas.height = 200;
const context = canvas.getContext('2d');
if (!context) {
throw new Error('Test setup error: cannot get canvas rendering context');
}
context.fillStyle = '#ff9900';
context.fillRect(10, 10, 20, 20);
});
it('converts a canvas to an Uint8Array, JPEG by default', async () => {
const result = await canvasToBytes(canvas);
assert.strictEqual(sniffImageMimeType(result), IMAGE_JPEG);
// These are just smoke tests.
assert.instanceOf(result, Uint8Array);
assert.isAtLeast(result.byteLength, 50);
});
it('can convert a canvas to a PNG Uint8Array', async () => {
const result = await canvasToBytes(canvas, IMAGE_PNG);
assert.strictEqual(sniffImageMimeType(result), IMAGE_PNG);
});
});