handler = message.getOutboundAttachment("spi-props");
assertEquals(MimeTypes.TEXT, handler.getContentType());
assertEquals(1, message.getOutboundAttachmentNames().size());
//Try without content type set
message.addOutboundAttachment("dummy", IOUtils.getResourceAsUrl("dummy.xml", getClass()), null);
handler = message.getOutboundAttachment("dummy");
assertEquals(MimeTypes.APPLICATION_XML, handler.getContentType());
assertEquals(2, message.getOutboundAttachmentNames().size());