chromium/third_party/blink/web_tests/http/tests/misc/empty-file-formdata.html

<html>
<head>
<script>
function test()
{
    if (window.testRunner) {
        testRunner.dumpAsText();
        testRunner.waitUntilDone();
    }

    document.forms[0].submit();
}

window.onload = test;
</script>
</head>
<body>
<form enctype="multipart/form-data" method="POST" action="resources/check-unnamed-file-included-in-formdata.php">
<input name="data" type="file"></input>
</form>
</body>
</html>