public virtual void testGetMessageElement()
{
JDFDoc d = new JDFDoc("JMF");
JDFJMF jmf = d.getJMFRoot();
JDFCommand c = (JDFCommand)jmf.appendMessageElement(EnumFamily.Command, EnumType.Events);
Assert.AreEqual(c, jmf.getMessageElement(EnumFamily.Command, EnumType.Events, 0));
jmf.appendComment();
JDFSignal s = (JDFSignal)jmf.appendMessageElement(EnumFamily.Signal, EnumType.Events);
Assert.AreEqual(s, jmf.getMessageElement(EnumFamily.Signal, EnumType.Events, 0));
Assert.AreEqual(s, jmf.getMessageElement(null, EnumType.Events, 1));
Assert.AreEqual(s, jmf.getMessageElement(null, null, 1));
JDFSignal s2 = (JDFSignal)jmf.appendMessageElement(EnumFamily.Signal, EnumType.Status);
Assert.AreEqual(s2, jmf.getMessageElement(EnumFamily.Signal, EnumType.Status, 0));
Assert.AreEqual(s2, jmf.getMessageElement(EnumFamily.Signal, null, 1));
Assert.AreEqual(s2, jmf.getMessageElement(null, null, 2));
Assert.AreEqual(s2, jmf.getMessageElement(null, null, -1));
Assert.AreEqual(s, jmf.getMessageElement(null, null, -2));
Assert.AreEqual(c, jmf.getMessageElement(null, null, -3));
Assert.IsNull(jmf.getMessageElement(null, null, -4));
}