@Test
public void testAppendSpeakableText() throws Exception {

    final SsmlDocument doc = new SsmlDocument();
    final SpeakableSsmlText speakable = new SpeakableSsmlText(doc);
    Assert.assertTrue(speakable.isSpeakableTextEmpty());
    speakable.appendSpeakableText("some");
    final Speak speak = doc.getSpeak();
    Assert.assertEquals("some", speak.getTextContent());
    speakable.appendSpeakableText(" text");
    Assert.assertEquals("some text", speak.getTextContent());
}