test_bug490879.html

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<!doctype html>

<title>Mozilla Bug 490879</title>

<link rel=stylesheet href="/tests/SimpleTest/test.css">

<script src="/tests/SimpleTest/SimpleTest.js"></script>

<a href="https://bugzilla.mozilla.org/show_bug.cgi?id=490879"

   target="_blank">Mozilla Bug 490879</a>

<iframe id="i1" width="200" height="100" src="about:blank"></iframe>

<img id="i" src="green.png">

<script>

async function runTest() {

  function verifyContent() {

    const kExpectedImgSpec = "data:image/png;base64,";

    var e = document.getElementById("i1");

    var doc = e.contentDocument;

    is(doc.getElementsByTagName("img")[0].src.substring(0, kExpectedImgSpec.length),

       kExpectedImgSpec, "The pasted image is a base64-encoded data: URI");

  async function pasteInto() {

    var e = document.getElementById("i1");

    var doc = e.contentDocument;

    doc.designMode = "on";

    doc.defaultView.focus();

    var selection = doc.defaultView.getSelection();

    selection.removeAllRanges();

    selection.selectAllChildren(doc.body);

    selection.collapseToEnd();

    let input = new Promise(resolve => {

      doc.body.addEventListener("input", resolve, {once: true})

});

    SpecialPowers.doCommand(window, "cmd_paste");

    info("Waiting for input event");

    await input;

  function copyToClipBoard() {

    SpecialPowers.setCommandNode(window, document.getElementById("i"));

    SpecialPowers.doCommand(window, "cmd_copyImageContents");

  copyToClipBoard();

  await pasteInto();

  verifyContent();

  SimpleTest.finish();

SimpleTest.waitForExplicitFinish();

addLoadEvent(runTest);

</script>