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chromium/third_party/blink/web_tests/fast/files/file-list-test.html 

<!DOCTYPE html>
<html>
<head>
<script src="../../resources/js-test.js"></script>
</head>
<body>
<input type="file" multiple onchange="onInputFileChange(this.files)">
<div id="description"></div>
<div id="console"></div>
<script>
description("Test the attribute of FileList.");

debug("Start");

function onInputFileChange(files)
{
    window.files = files;
    shouldBeTrue("files instanceof FileList");
    shouldBe("files.length", "2");
    shouldBeTrue("files.item(0) instanceof File");
    shouldBeEqualToString("files.item(0).name", "UTF8.txt");
    shouldBeTrue("files.item(1) instanceof File");
    shouldBeEqualToString("files.item(1).name", "UTF8-2.txt");
    shouldBeNull("files.item(2)");
    shouldBeNull("files.item(-1)");
    shouldBeTrue("files.item(0) === files.item(4294967296)");
    shouldBeTrue("files.item(1) === files.item(4294967297)");
    shouldBeTrue("files.item(2) === files.item(4294967298)");
    shouldBeTrue("files.item(-1) === files.item(4294967295)");
    shouldBeTrue("files.item(-4294967295) === files.item(1)");
    shouldBeTrue("files.item(-4294967296) === files.item(0)");
    shouldBeTrue("files.item(null) === files.item(0)");
    shouldBeTrue("files.item(undefined) === files.item(0)");
}

eventSender.beginDragWithFiles(["resources/UTF8.txt", "resources/UTF8-2.txt"]);
eventSender.mouseMoveTo(10, 10);
eventSender.mouseUp();

</script>
</body>
</html>