/**
* Test of getExtensions method of class SimpleMapper with XMLString.
*/
@Test
public void testGetExtensions() throws Exception {
Packet packet = new Message();
SimpleMapper<TestStringDocument> instance = new SimpleMapper(TestStringDocument.class);
instance.addExtension(packet, testXmlString1);
instance.addExtension(packet, testXmlString2);
Collection <TestStringDocument> result = instance.getExtensions(packet);
assertEquals("getExtensions must return values which were put", 2,