@Test
public void testIsSpeakableTextEmpty() throws Exception {

    final SsmlDocument simple = new SsmlDocument();
    final SpeakableSsmlText simpleSpeakable = new SpeakableSsmlText(simple);
    Assert.assertTrue(simpleSpeakable.isSpeakableTextEmpty());
    simpleSpeakable.appendSpeakableText("some text");
    Assert.assertFalse(simpleSpeakable.isSpeakableTextEmpty());
    final SpeakableSsmlText emptySpeakable =
            new SpeakableSsmlText((SsmlDocument)null);
    Assert.assertTrue(emptySpeakable.isSpeakableTextEmpty());
    emptySpeakable.appendSpeakableText("some text");
    Assert.assertTrue(emptySpeakable.isSpeakableTextEmpty());
}