browser_openMessageFromFile.js

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/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

const { MockFilePicker } = ChromeUtils.importESModule(

  "resource://testing-common/MockFilePicker.sys.mjs"

);

add_task(async function test_openMessageFromFilePicker() {

  const expectedFilterLabel = await document.l10n.formatValue(

    "messenger-eml-files-filter"

);

  MockFilePicker.init();

  MockFilePicker.returnValue = MockFilePicker.returnCancel;

  let filterLabel;

  let filterPattern;

  MockFilePicker.appendFilterCallback = (_picker, label, pattern) => {

    filterLabel = label;

    filterPattern = pattern;

};

  const pickerOpened = new Promise(resolve => {

    MockFilePicker.afterOpenCallback = resolve;

});

  try {

    await window.MsgOpenFromFile();

    const picker = await pickerOpened;

    Assert.equal(picker.mode, Ci.nsIFilePicker.modeOpen);

    Assert.equal(filterLabel, expectedFilterLabel);

    Assert.equal(filterPattern, "*.eml");

  } finally {

    MockFilePicker.cleanup();

});