browser_blobFromFile.js

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add_task(async function test() {

  await SpecialPowers.pushPrefEnv({

    set: [["browser.tabs.remote.separateFileUriProcess", true]],

});

  let fileData = "";

  for (var i = 0; i < 100; ++i) {

    fileData += "hello world!";

  let file = Services.dirsvc.get("ProfD", Ci.nsIFile);

  file.append("file.txt");

  file.createUnique(Ci.nsIFile.NORMAL_FILE_TYPE, 0o600);

  let outStream = Cc[

    "@mozilla.org/network/file-output-stream;1"

  ].createInstance(Ci.nsIFileOutputStream);

  outStream.init(

    file,

    0x02 | 0x08 | 0x20, // write, create, truncate

    // eslint-disable-next-line no-octal

    0666,

);

  outStream.write(fileData, fileData.length);

  outStream.close();

  let fileHandler = Services.io

    .getProtocolHandler("file")

    .QueryInterface(Ci.nsIFileProtocolHandler);

  let fileURL = fileHandler.getURLSpecFromActualFile(file);

  info("Opening url: " + fileURL);

  let tab = BrowserTestUtils.addTab(gBrowser, fileURL);

  let browser = gBrowser.getBrowserForTab(tab);

  await BrowserTestUtils.browserLoaded(browser);

  let blob = await SpecialPowers.spawn(

    browser,

    [file.leafName],

    function (fileName) {

      return new content.window.Promise(resolve => {

        let xhr = new content.window.XMLHttpRequest();

        xhr.responseType = "blob";

        xhr.open("GET", fileName);

        xhr.send();

        xhr.onload = function () {

          resolve(xhr.response);

};

});

);

  ok(File.isInstance(blob), "We have a file");

  is(blob.size, file.fileSize, "The size matches");

  is(blob.name, file.leafName, "The name is correct");

  file.remove(false);

  gBrowser.removeTab(tab);

});