beforeEach(() => {
    global.window.speechSynthesis = {
        getVoices: () => (null),
    };
});

it('supports speech and locale', () => {
    const getVoicesStub = sinon.stub(
        global.window.speechSynthesis,
        'getVoices');

    getVoicesStub.callsFake(() => (
        [{lang: 'en_US'}]
    ));

it('will choose best matching locale', () => {
    const getVoicesStub = sinon.stub(
        global.window.speechSynthesis,
        'getVoices');

    getVoicesStub.callsFake(() => (
        [{lang: 'es_MX'}, {lang: 'es_US'}]
    ));