Admin: Actually clean up test channel from configuration

943f397 did not actually because:

1. the 'part' command is not available (it's in the Channel plugin)
   so it just didn't do anything
2. one of the tests was missing the cleanup

plugins/Admin/test.py

@@ -50,6 +50,7 @@ def getAfterJoinMessages():
         self.irc.feedMsg(ircmsgs.join('#Baz', prefix=self.prefix))
         getAfterJoinMessages()
         self.assertRegexp('channels', '#bar, #Baz, and #foo')
+        self.assertNotRegexp('config networks.test.channels', '.*#foo.*')
 
     def testIgnoreAddRemove(self):
         self.assertNotError('admin ignore add foo!bar@baz')
@@ -96,7 +97,7 @@ def testJoin(self):
             self.assertEqual(m.args[0], '#foo')
             self.assertEqual(m.args[1], 'key')
         finally:
-            self.getMsg('part #foo')
+            conf.supybot.networks.test.channels.setValue('')
 
     def testNick(self):
         try:
@@ -110,10 +111,13 @@ def testAddCapabilityOwner(self):
         self.assertError('admin capability add %s owner' % self.nick)
 
     def testJoinOnOwnerInvite(self):
-        self.irc.feedMsg(ircmsgs.invite(conf.supybot.nick(), '#foo', prefix=self.prefix))
-        m = self.getMsg(' ')
-        self.assertEqual(m.command, 'JOIN')
-        self.assertEqual(m.args[0], '#foo')
+        try:
+            self.irc.feedMsg(ircmsgs.invite(conf.supybot.nick(), '#foo', prefix=self.prefix))
+            m = self.getMsg(' ')
+            self.assertEqual(m.command, 'JOIN')
+            self.assertEqual(m.args[0], '#foo')
+        finally:
+            conf.supybot.networks.test.channels.setValue('')
 
     def testNoJoinOnUnprivilegedInvite(self):
         try:
@@ -124,6 +128,7 @@ def testNoJoinOnUnprivilegedInvite(self):
                     'Error: "somecommand" is not a valid command.')
         finally:
             world.testing = True
+            self.assertNotRegexp('config networks.test.channels', '.*#foo.*')
 
     def testAcmd(self):
         self.irc.feedMsg(ircmsgs.join('#foo', prefix=self.prefix))