Added a new SleekTest class that provides useful methods for test cases.

Can now use: (where self is a SleekTest instance)
self.stanzaPlugin(stanza, plugin)
self.Message()  \
self.Iq()        > Just like basexmpp.Message(), etc.
self.Presence() /
self.checkMessage(msg, xmlstring)
self.checkIq(iq, xmlstring)
self.checkPresence(pres, xmlstring) <- Not implemented yet, but stub is there.

The check* methods also accept a use_values keyword argument that defaults to True.
When this value is True, an additional test is executed by creating a stanza using
getValues() and setValues(). Since some stanza objects can override these two methods,
disabling this test is sometimes required.

tests/sleektest.py

@@ -0,0 +1,159 @@
+"""
+    SleekXMPP: The Sleek XMPP Library
+    Copyright (C) 2010 Nathanael C. Fritz, Lance J.T. Stout
+    This file is part of SleekXMPP.
+
+    See the file license.txt for copying permission.
+"""
+
+import unittest
+from xml.etree import cElementTree as ET
+from sleekxmpp import Message, Iq
+from sleekxmpp.stanza.presence import Presence
+from sleekxmpp.xmlstream.matcher.stanzapath import StanzaPath
+
+
+class SleekTest(unittest.TestCase):
+    """
+    A SleekXMPP specific TestCase class that provides
+    methods for comparing message, iq, and presence stanzas.
+    """
+
+    def stanzaPlugin(self, stanza, plugin):
+        """
+        Associate a stanza object as a plugin for another stanza.
+        """
+        tag = "{%s}%s" % (plugin.namespace, plugin.name)
+	stanza.plugin_attrib_map[plugin.plugin_attrib] = plugin
+	stanza.plugin_tag_map[tag] = plugin
+
+    def Message(self, *args, **kwargs):
+        """Create a message stanza."""
+        return Message(None, *args, **kwargs)
+
+    def Iq(self, *args, **kwargs):
+        """Create an iq stanza."""
+        return Iq(None, *args, **kwargs)
+
+    def Presence(self, *args, **kwargs):
+        """Create a presence stanza."""
+        return Presence(None, *args, **kwargs)
+
+    def checkMessage(self, msg, xml_string, use_values=True):
+        """
+        Create and compare several message stanza objects to a 
+        correct XML string. 
+
+        If use_values is False, the test using getValues() and 
+        setValues() will not be used.
+        """
+
+        debug = "Given Stanza:\n%s\n" % ET.tostring(msg.xml)
+
+        xml = ET.fromstring(xml_string)
+        xml.tag = '{jabber:client}message'
+        debug += "XML String:\n%s\n" % ET.tostring(xml)
+        
+        msg2 = self.Message(xml)
+        debug += "Constructed Stanza:\n%s\n" % ET.tostring(msg2.xml)
+        
+        if use_values:
+            # Ugly, but need to make sure the type attribute is set.
+            msg['type'] = msg['type']
+            if xml.attrib.get('type', None) is None:
+                xml.attrib['type'] = 'normal'
+
+            values = msg2.getValues()
+            msg3 = self.Message()
+            msg3.setValues(values)
+            
+            debug += "Second Constructed Stanza:\n%s\n" % ET.tostring(msg3.xml)
+            debug = "Three methods for creating stanza do not match:\n" + debug
+            self.failUnless(self.compare([xml, msg.xml, 
+                                          msg2.xml, msg3.xml]), 
+                            debug)
+        else:
+            debug = "Two methods for creating stanza do not match:\n" + debug
+            self.failUnless(self.compare([xml, msg.xml, msg2.xml]), debug)
+
+    def checkIq(self, iq, xml_string, use_values=True):
+        """
+        Create and compare several iq stanza objects to a 
+        correct XML string. 
+
+        If use_values is False, the test using getValues() and 
+        setValues() will not be used.
+        """
+        debug = "Given Stanza:\n%s\n" % ET.tostring(iq.xml)
+
+        xml = ET.fromstring(xml_string)
+        xml.tag = '{jabber:client}iq'
+        debug += "XML String:\n%s\n" % ET.tostring(xml)
+        
+        iq2 = self.Iq(xml)
+        debug += "Constructed Stanza:\n%s\n" % ET.tostring(iq2.xml)
+        
+        if use_values:
+            values = iq.getValues()
+            iq3 = self.Iq()
+            iq3.setValues(values)
+
+            debug += "Second Constructed Stanza:\n%s\n" % ET.tostring(iq3.xml)
+            debug = "Three methods for creating stanza do not match:\n" + debug
+            self.failUnless(self.compare([xml, iq.xml, iq2.xml, iq3.xml]), 
+                            debug)
+        else:
+            debug = "Two methods for creating stanza do not match:\n" + debug
+            self.failUnless(self.compare([xml, iq.xml, iq2.xml]), debug)
+
+    def checkPresence(self, pres, xml_string, use_values=True):
+        """
+        Create and compare several presence stanza objects to a 
+        correct XML string. 
+
+        If use_values is False, the test using getValues() and 
+        setValues() will not be used.
+        """
+        pass
+
+    def compare(self, xml1, xml2=None):
+        """
+        Compare XML objects.
+
+        If given a list of XML objects, then
+        all of the elements in the list will be
+        compared.
+        """
+
+        # Compare multiple objects
+        if type(xml1) is list:
+            xmls = xml1
+            xml1 = xmls[0]
+            for xml in xmls[1:]:
+                xml2 = xml
+                if not self.compare(xml1, xml2):
+                    return False
+            return True
+
+        # Step 1: Check tags
+        if xml1.tag != xml2.tag:
+            print xml1.tag, xml2.tag
+            return False
+
+        # Step 2: Check attributes
+        if xml1.attrib != xml2.attrib:
+            return False
+
+        # Step 3: Recursively check children
+        for child in xml1:
+            child2s = xml2.findall("%s" % child.tag)
+            if child2s is None:
+                return False
+            for child2 in child2s:
+                if self.compare(child, child2):
+                    break
+            else:
+                return False
+
+        # Everything matches
+        return True