gather: nodeps should take packages from comps groups

When gather_method is set to nodeps, we should not ignore the comps
group that the method received. Instead it should find out which
packages are in those groups and take them into the compose.

In order for this to be of any reasonable use, the comps file needs to
include all dependencies for the packages.

Fixes: #653
Signed-off-by: Lubomír Sedlář <lsedlar@redhat.com>

tests/test_gather_method_nodeps.py

@@ -0,0 +1,26 @@
+# -*- coding: utf-8 -*-
+
+import mock
+import os
+import sys
+
+sys.path.insert(0, os.path.join(os.path.dirname(__file__), ".."))
+
+from pungi.phases.gather.methods import method_nodeps as nodeps
+from tests import helpers
+
+COMPS_FILE = os.path.join(helpers.FIXTURE_DIR, 'comps.xml')
+
+
+class TestWritePungiConfig(helpers.PungiTestCase):
+    def setUp(self):
+        super(TestWritePungiConfig, self).setUp()
+        self.compose = helpers.DummyCompose(self.topdir, {})
+        self.compose.DEBUG = False
+        self.compose.paths.work.comps = mock.Mock(return_value=COMPS_FILE)
+
+    def test_expand_group(self):
+        packages = nodeps.expand_groups(self.compose, 'x86_64', ['core', 'text-internet'])
+        self.assertItemsEqual(packages, [('dummy-bash', 'x86_64'),
+                                         ('dummy-elinks', 'x86_64'),
+                                         ('dummy-tftp', 'x86_64')])