add domain test for placement_group

Author: Adrian Huber

tests/unit/placement_groups/test_domain.py

@@ -0,0 +1,11 @@
+import datetime
+from dateutil.tz import tzoffset
+
+from hcloud.placement_groups.domain import PlacementGroup
+
+
+class TestPlacementGroup(object):
+
+    def test_created_is_datetime(self):
+        placement_group = PlacementGroup(id=1, created="2016-01-30T23:50+00:00")
+        assert placement_group.created == datetime.datetime(2016, 1, 30, 23, 50, tzinfo=tzoffset(None, 0))