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