list-channels CLI command

Related: https://pagure.io/koji/issue/437

tests/test_cli/data/list-commands.txt

@@ -95,6 +95,7 @@ info commands:
         latest-build              Print the latest builds for a tag
         list-api                  Print the list of XML-RPC APIs
         list-buildroot            List the rpms used in or built in a buildroot
+        list-channels             Print channels listing
         list-external-repos       List external repos
         list-groups               Print the group listings
         list-history              Display historical data

tests/test_cli/test_list_channels.py

@@ -0,0 +1,41 @@
+from __future__ import absolute_import
+import mock
+import unittest
+from six.moves import StringIO
+
+import koji
+
+from . import loadcli
+cli = loadcli.cli
+
+class TestListChannels(unittest.TestCase):
+    def setUp(self):
+        self.options = mock.MagicMock()
+        self.session = mock.MagicMock()
+        self.session.getAPIVersion.return_value = koji.API_VERSION
+        self.args = mock.MagicMock()
+        self.original_parser = cli.OptionParser
+        cli.OptionParser = mock.MagicMock()
+        self.parser = cli.OptionParser.return_value
+        cli.options = self.options  # globals!!!
+
+    def tearDown(self):
+        cli.OptionParser = self.original_parser
+
+    @mock.patch('sys.stdout', new_callable=StringIO)
+    def test_list_channels(self, stdout):
+        options = mock.MagicMock()
+        options.quiet = True
+        self.parser.parse_args.return_value = [options, []]
+
+        # mock xmlrpc
+        self.session.listChannels.return_value = [
+            {'id': 1, 'name': 'default'},
+            {'id': 2, 'name': 'test'},
+        ]
+        self.session.multiCall.return_value = [[[1,2,3]], [[4,5]]]
+
+        cli.anon_handle_list_channels(self.options, self.session, self.args)
+        actual = stdout.getvalue()
+        expected = 'successfully connected to hub\ndefault             3\ntest                2\n'
+        self.assertMultiLineEqual(actual, expected)