Added unit tests for error stanzas. Corrected error in deleting conditions.

tests/test_errorstanzas.py

@@ -0,0 +1,56 @@
+from sleektest import *
+
+class TestErrorStanzas(SleekTest):
+    
+    def testSetup(self):
+        """Test setting initial values in error stanza."""
+        msg = self.Message()
+        msg.enable('error')
+        self.checkMessage(msg, """
+          <message type="error">
+            <error type="cancel">
+              <feature-not-implemented xmlns="urn:ietf:params:xml:ns:xmpp-stanzas" />
+            </error>
+          </message>
+        """)
+
+    def testCondition(self):
+        """Test modifying the error condition."""
+	msg = self.Message()
+        msg['error']['condition'] = 'item-not-found'
+
+        self.checkMessage(msg, """
+          <message type="error">
+            <error type="cancel">
+              <item-not-found xmlns="urn:ietf:params:xml:ns:xmpp-stanzas" />
+            </error>
+          </message>
+        """)
+
+        self.failUnless(msg['error']['condition'] == 'item-not-found', "Error condition doesn't match.")
+
+        del msg['error']['condition']
+
+        self.checkMessage(msg, """
+          <message type="error">
+            <error type="cancel" />
+          </message>
+         """)
+
+    def testDelCondition(self):
+        """Test that deleting error conditions doesn't remove extra elements."""
+        msg = self.Message()
+        msg['error']['text'] = 'Error!'
+        msg['error']['condition'] = 'internal-server-error'
+         
+        del msg['error']['condition']
+
+        self.checkMessage(msg, """
+          <message type="error">
+            <error type="cancel">
+              <text xmlns="urn:ietf:params:xml:ns:xmpp-stanzas">Error!</text>
+            </error>
+          </message>
+        """)
+
+suite = unittest.TestLoader().loadTestsFromTestCase(TestErrorStanzas)