xmlhttprequest-open-empty-method.html

<html>
<body>
<p>Test that open throws a SYNTAX_ERR exception when called with an empty method.</p>
<pre id="result">FAIL: script didn't run or raised an unexpected exception.</pre>
<script>
    if (window.testRunner)
        testRunner.dumpAsText();

    var result = "FAIL: no exception was caught";
    var req = new XMLHttpRequest;
    try {
        req.open("", "resources/print-headers.cgi", false);
    } catch (ex) {
        result = "SUCCESS: got exception " + ex;
    }
    document.getElementById("result").textContent = result;
</script>
</body>
</html>

chromium/third_party/blink/web_tests/http/tests/xmlhttprequest/xmlhttprequest-open-empty-method.html