chromium/src/third_party/blink/web_tests/fast/canvas/canvas-toDataURL-bitmaprenderer.html

<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>

<script>

function testGetURL(image) {
	var can = document.createElement('canvas');
	var ctx = can.getContext('bitmaprenderer');
	ctx.transferFromImageBitmap(image);
	var dataURL = can.toDataURL();

	assert_equals(dataURL, image.src);
}

test(function(t) {
	var magentaPixelImg = document.createElement('img');
	// This is a base64 encoded string representing a single magenta pixel
	magentaPixelImg.src = "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mP8z/D/PwAHAwL/qGeMxAAAAABJRU5ErkJggg==";
	createImageBitmap(magentaPixelImg,0,0,magentaPixelImg.naturalWidth,magentaPixelImg.naturalHeight).then(testGetURL);
}, "Test that canvas toDataURL returns the same URL that was expected when the canvas is of bitmaprenderer type.")

</script>