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chromium/third_party/blink/web_tests/external/wpt/clipboard-apis/dataTransfer-clearData.html 

<!doctype html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<p id="description"></p>
<div id="console"></div>
<script>
const dataTransfer = new DataTransfer();
const filename = "1.png";
const filename2 = "2.png";

test(() => {
    const file = new File(["🕺💃"], filename, {
        type: "image/png"
    });

    const file2 = new File(["🕺💃"], filename2, {
        type: "image/png"
    });

    dataTransfer.items.add(file);
    dataTransfer.items.add(file2);
    assert_equals(dataTransfer.items.length, 2);
    assert_equals(dataTransfer.types.length, 1);

    dataTransfer.setData("text/plain", "hi");
    assert_equals(dataTransfer.items.length, 3);
    assert_equals(dataTransfer.types.length, 2);

    dataTransfer.items.add("hi 2", "text/html");
    dataTransfer.items.add("new octet item", "application/octet-stream");

    assert_equals(dataTransfer.items.length, 5);
    assert_equals(dataTransfer.types.length, 4);

    dataTransfer.clearData("text/html");
    assert_equals(dataTransfer.items.length, 4);
    assert_equals(dataTransfer.types.length, 3);

    dataTransfer.clearData();
    assert_equals(dataTransfer.items.length, 2);
    assert_equals(dataTransfer.files.length, 2);
    assert_equals(dataTransfer.types.length, 1);
    assert_equals(dataTransfer.types[0], "Files");
    assert_equals(dataTransfer.files[0].name, filename);
    assert_equals(dataTransfer.files[1].name, filename2);

    dataTransfer.items.add("hi", "text/plain");
    assert_equals(dataTransfer.items.length, 3);
    assert_equals(dataTransfer.files.length, 2);
    assert_equals(dataTransfer.types.length, 2);

    dataTransfer.items.clear();
    assert_equals(dataTransfer.items.length, 0);
    assert_equals(dataTransfer.files.length, 0);
    assert_equals(dataTransfer.types.length, 0);
}, 'Clear data from dataTransfer');
</script>
</body>
</html>