Added test for CG_Importer test_build

tests/test_hub/cg_importer_json/default.json

@@ -3,6 +3,7 @@
            "version": "7.1",
            "release": "4",
            "source": "git://git.engineering.redhat.com/users/vpavlin/tdl_templates.git#a14f145244",
+           "extra": {},
            "start_time": 1423148398,
            "end_time": 1423148828},
  "buildroots": [{"id": 1,

tests/test_hub/test_cg_importer.py

@@ -58,3 +58,16 @@ class TestCGImporter(unittest.TestCase):
         x.assert_cg_access()
         assert x.cgs
         assert isinstance(x.cgs, set)
+
+    @mock.patch('kojihub.context')
+    @mock.patch("koji.pathinfo.work")
+    def test_prep_build(self, work, context):
+        work.return_value = os.path.dirname(__file__)
+        cursor = mock.MagicMock()
+        context.cnx.cursor.return_value = cursor
+        #cursor.fetchall.return_value = [(1, 'foo'), (2, 'bar')]
+        x = kojihub.CG_Importer()
+        x.get_metadata('default.json', 'cg_importer_json')
+        x.prep_build()
+        assert x.buildinfo
+        assert isinstance(x.buildinfo, dict)