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ez-offscreen-canvas-tests.html
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ez-offscreen-canvas-tests.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>ez-offscreen-canvas tests</title>
<link rel="stylesheet" href="/node_modules/qunit/qunit/qunit.css">
</head>
<body>
<div id="qunit"></div>
<div id="qunit-fixture">
<canvas id="canvas"></canvas>
</div>
<script src="/node_modules/qunit/qunit/qunit.js"></script>
<script type="module">
import { ezOffscreenCanvas } from './ez-offscreen-canvas.js';
const { module, test } = QUnit;
const wait = (condition, timeout) => new Promise((resolve, reject) => {
const startTime = Date.now();
const endTime = startTime + timeout;
const checkCondition = () => {
if (condition()) {
resolve();
} else if (Date.now() > endTime) {
reject();
} else {
setTimeout(checkCondition);
}
};
checkCondition();
});
module('ez-offscreen-canvas', function() {
test('throws an error if OffscreenCanvas is not support and workerOnly option is true', function(assert) {
const transferControlToOffscreen = HTMLCanvasElement.prototype.transferControlToOffscreen;
delete HTMLCanvasElement.prototype.transferControlToOffscreen;
const canvas = document.getElementById('canvas');
const props = {};
const code = () => {};
assert.throws(
() => ezOffscreenCanvas(canvas, props, code, { workerOnly: true }),
new RegExp('The ezOffscreenCanvas can only be used in browsers that support OffscreenCanvas. For more info, see the documentation at https://pretty-okay.dev/ez-offscreen-canvas.')
);
HTMLCanvasElement.prototype.transferControlToOffscreen = transferControlToOffscreen;
});
test('throws an error if the first argument is not an instance of HTMLCanvasElement', function(assert) {
const canvas = document.createElement('div');
const props = {};
const code = () => {};
assert.throws(
() => ezOffscreenCanvas(canvas, props, code),
new RegExp('The first argument to ezOffscreenCanvas must be an instance of HTMLCanvasElement. For more info, see the documentation at https://pretty-okay.dev/ez-offscreen-canvas.')
);
});
test('throws an error if the second argument is not an object or null', function(assert) {
const canvas = document.getElementById('canvas');
const props = 1337;
const code = () => {};
assert.throws(
() => ezOffscreenCanvas(canvas, props, code),
new RegExp('The second argument to ezOffscreenCanvas must be an object or null. For more info, see the documentation at https://pretty-okay.dev/ez-offscreen-canvas.')
);
});
test('throws an error if the third argument not a function', function(assert) {
const canvas = document.getElementById('canvas');
const props = {};
const code = 'some code';
assert.throws(
() => ezOffscreenCanvas(canvas, props, code),
new RegExp('The third argument to ezOffscreenCanvas must be a function. For more info, see the documentation at https://pretty-okay.dev/ez-offscreen-canvas.')
);
});
module('OffscreenCanvas is supported', function() {
test('creates a Worker that gets passed an OffscreenCanvas', async function(assert) {
assert.expect(0);
const canvas = document.getElementById('canvas');
const props = null;
const code = ({ canvas }) => {
const context = canvas.getContext('2d');
context.strokeRect(0, 0, 1, 1);
};
const originalDataURL = canvas.toDataURL();
const offscreenCanvasWorker = ezOffscreenCanvas(canvas, props, code);
await wait(() => canvas.toDataURL() !== originalDataURL, 5000);
offscreenCanvasWorker.terminate();
});
test('creates a Worker that gets passed an OffscreenCanvas with other props', async function(assert) {
assert.expect(0);
const canvas = document.getElementById('canvas');
const props = { drawRect: true };
const code = ({ canvas, drawRect }) => {
const context = canvas.getContext('2d');
if (drawRect) context.strokeRect(0, 0, 1, 1);
};
const originalDataURL = canvas.toDataURL();
const offscreenCanvasWorker = ezOffscreenCanvas(canvas, props, code);
await wait(() => canvas.toDataURL() !== originalDataURL, 5000);
offscreenCanvasWorker.terminate();
});
test('can set attributes on the canvas', async function(assert) {
assert.expect(2);
const canvas = document.getElementById('canvas');
const props = null;
const code = ({ canvas }) => {
const context = canvas.getContext('2d');
context.strokeRect(0, 0, 1, 1);
};
const offscreenCanvasWorker = ezOffscreenCanvas(canvas, props, code);
assert.equal(canvas.height, 150);
assert.equal(canvas.width, 300);
offscreenCanvasWorker.setAttributes({ width: 700, height: 350 });
await wait(() => canvas.width === 700, 5000);
await wait(() => canvas.height === 350, 5000);
offscreenCanvasWorker.terminate();
});
});
module('OffscreenCanvas is NOT supported', function(hooks) {
hooks.beforeEach(function() {
this.transferControlToOffscreen = HTMLCanvasElement.prototype.transferControlToOffscreen;
delete HTMLCanvasElement.prototype.transferControlToOffscreen;
});
hooks.afterEach(function() {
HTMLCanvasElement.prototype.transferControlToOffscreen = this.transferControlToOffscreen;
});
test('invokes the render function with the canvas', async function(assert) {
assert.expect(0);
const canvas = document.getElementById('canvas');
const props = null;
const code = ({ canvas }) => {
const context = canvas.getContext('2d');
context.strokeRect(0, 0, 1, 1);
};
const originalDataURL = canvas.toDataURL();
const offscreenCanvasWorker = ezOffscreenCanvas(canvas, props, code);
await wait(() => canvas.toDataURL() !== originalDataURL, 5000);
offscreenCanvasWorker.terminate();
});
test('invokes the render function with the canvas and other props', async function(assert) {
assert.expect(0);
const canvas = document.getElementById('canvas');
const props = { drawRect: true };
const code = ({ canvas, drawRect }) => {
const context = canvas.getContext('2d');
if (drawRect) context.strokeRect(0, 0, 1, 1);
};
const originalDataURL = canvas.toDataURL();
const offscreenCanvasWorker = ezOffscreenCanvas(canvas, props, code);
await wait(() => canvas.toDataURL() !== originalDataURL, 5000);
offscreenCanvasWorker.terminate();
});
test('can set attributes on the canvas', async function(assert) {
assert.expect(2);
const canvas = document.getElementById('canvas');
const props = null;
const code = ({ canvas }) => {
const context = canvas.getContext('2d');
context.strokeRect(0, 0, 1, 1);
};
const offscreenCanvasWorker = ezOffscreenCanvas(canvas, props, code);
assert.equal(canvas.height, 150);
assert.equal(canvas.width, 300);
offscreenCanvasWorker.setAttributes({ width: 700, height: 350 });
await wait(() => canvas.width === 700, 5000);
await wait(() => canvas.height === 350, 5000);
offscreenCanvasWorker.terminate();
});
});
});
</script>
<script src="/testem.js"></script>
</body>
</html>