offscreencanvas.constructor.worker.js

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This WPT test may be referenced by the following Test IDs:
- /html/canvas/offscreen/manual/the-offscreen-canvas/offscreencanvas.constructor.worker.html - WPT Dashboard Interop Dashboard

// spec link: https://html.spec.whatwg.org/#dom-offscreencanvas

importScripts("/resources/testharness.js");

importScripts("/html/canvas/resources/canvas-tests.js");

var t1 = async_test("Test that calling OffscreenCanvas's constructor generates correct width and height.");

t1.step(function() {

    var offscreenCanvas = new OffscreenCanvas(100, 50);

    assert_equals(offscreenCanvas.width, 100);

    assert_equals(offscreenCanvas.height, 50);

    offscreenCanvas.width = 50;

    offscreenCanvas.height = 100;

    assert_equals(offscreenCanvas.width, 50);

    assert_equals(offscreenCanvas.height, 100);

    t1.done();

});

var t2 = async_test("Test that OffscreenCanvas constructor handles invalid arguments correctly in a worker");

t2.step(function() {

    var offscreenCanvas1 = new OffscreenCanvas(1, 1);

    offscreenCanvas1.width = null;

    offscreenCanvas1.height = null;

    assert_equals(offscreenCanvas1.width, 0);

    assert_equals(offscreenCanvas1.height, 0);

    assert_throws_js(TypeError, function() { new OffscreenCanvas(-1, -1); });

    var offscreenCanvas2 = new OffscreenCanvas(null, null);

    assert_equals(offscreenCanvas2.width, 0);

    assert_equals(offscreenCanvas2.height, 0);

    assert_throws_js(TypeError, function() { offscreenCanvas2.width = -1; });

    assert_throws_js(TypeError, function() { offscreenCanvas2.height = -1; });

    var obj = {Name: "John Doe", Age: 30};

    assert_throws_js(TypeError, function() { offscreenCanvas2.width = obj; });

    assert_throws_js(TypeError, function() { offscreenCanvas2.height = obj; });

    assert_throws_js(TypeError, function() { new OffscreenCanvas(obj, obj); });

    t2.done();

});

done();