Blob-methods-from-detached-frame.html

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This WPT test may be referenced by the following Test IDs:
- /FileAPI/Blob-methods-from-detached-frame.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<meta charset="utf-8">

<title>Blob methods from detached frame work as expected</title>

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<iframe id="emptyDocumentIframe" src="../support/empty-document.html"></iframe>

<script>

const BlobPrototypeFromDetachedFramePromise = new Promise(resolve => {

    emptyDocumentIframe.onload = () => {

        const BlobPrototype = emptyDocumentIframe.contentWindow.Blob.prototype;

        emptyDocumentIframe.remove();

        resolve(BlobPrototype);

};

});

const charCodeArrayToString = charCodeArray => Array.from(charCodeArray, c => String.fromCharCode(c)).join("");

const charCodeBufferToString = charCodeBuffer => charCodeArrayToString(new Uint8Array(charCodeBuffer));

promise_test(async () => {

    const { slice } = await BlobPrototypeFromDetachedFramePromise;

    const blob = new Blob(["foobar"]);

    const slicedBlob = slice.call(blob, 1, 3);

    assert_true(slicedBlob instanceof Blob);

    assert_equals(await slicedBlob.text(), "oo");

    assert_equals(charCodeBufferToString(await slicedBlob.arrayBuffer()), "oo");

    assert_equals(charCodeArrayToString(await slicedBlob.bytes()), "oo");

    const reader = slicedBlob.stream().getReader();

    const { value } = await reader.read();

    assert_equals(charCodeArrayToString(value), "oo");

}, "slice()");

promise_test(async () => {

    const { text } = await BlobPrototypeFromDetachedFramePromise;

    const blob = new Blob(["foo"]);

    assert_equals(await text.call(blob), "foo");

}, "text()");

promise_test(async () => {

    const { arrayBuffer } = await BlobPrototypeFromDetachedFramePromise;

    const blob = new Blob(["bar"]);

    const charCodeBuffer = await arrayBuffer.call(blob);

    assert_equals(charCodeBufferToString(charCodeBuffer), "bar");

}, "arrayBuffer()");

promise_test(async () => {

    const { bytes } = await BlobPrototypeFromDetachedFramePromise;

    const blob = new Blob(["bar"]);

    const charCodeBytes = await bytes.call(blob);

    assert_equals(charCodeArrayToString(charCodeBytes), "bar");

}, "bytes()");

promise_test(async () => {

    const { stream } = await BlobPrototypeFromDetachedFramePromise;

    const blob = new Blob(["baz"]);

    const reader = stream.call(blob).getReader();

    const { value } = await reader.read();

    assert_equals(charCodeArrayToString(value), "baz");

}, "stream()");

</script>