LayoutTests/http/tests/contentextensions/block-cookies-send.html

<script>
if (window.testRunner) {
	testRunner.dumpAsText();
	testRunner.dumpChildFramesAsText();
	testRunner.waitUntilDone();
}

function iframeDone()
{
	document.getElementById("logger").innerHTML += "After the iframe, document.cookie is '" + document.cookie + "'<br>";

	if (window.testRunner)
		testRunner.notifyDone();
}

function imageDone()
{
	document.getElementById("logger").innerHTML += "After the image, document.cookie is '" + document.cookie + "'<br>";
	document.getElementById("iframe").onload = iframeDone;
	document.getElementById("iframe").src = "http://127.0.0.1:8000/cookies/resources/echo-cookies.py";
}


</script>

This test loads a resource that sets a cookie, then verifies that the cookie is not sent out when it should be blocked.<br>
<div id="logger"></div>
<img src="http://127.0.0.1:8000/cookies/resources/cookie-utility.py?queryfunction=setFooCookie" onerror="imageDone();">
<iframe id="iframe" name="iframe"></iframe>