Add time- and version-stamps to created objects

test/targets/test_mongo_target.py

@@ -1,10 +1,11 @@
 from pymongo import MongoClient
 from random import randint
+from datetime import datetime, timedelta
 
 from metrik.targets.mongo import MongoTarget
 from metrik.conf import get_config
 from test.mongo_test import MongoTest
-
+from metrik import __version__ as version
 
 class MongoTargetTest(MongoTest):
 
@@ -38,4 +39,23 @@ class MongoTargetTest(MongoTest):
         # Make sure we can trivially scale correctly
         targets = [MongoTarget('test_collection', i) for i in range(10000)]
 
-        self.assertEqual(len(targets), 10000)
+        self.assertEqual(len(targets), 10000)
+
+    def test_metrik_version_saved(self):
+        t = MongoTarget('test_collection', 1234)
+        t.persist({})
+        r = t.retrieve()
+        assert r['_metrik_version'] == version
+
+    def test_created_at_timestamp(self):
+        present = datetime.now()
+        t = MongoTarget('test_collection', 1234)
+        t.persist({})
+        r = t.retrieve()
+        self.assertGreaterEqual(present, r['_created_at'])
+
+        one_second_past = present - timedelta(seconds=1)
+        t = MongoTarget('test_collection', 1235)
+        t.persist({}, present=one_second_past)
+        r = t.retrieve()
+        self.assertEqual(one_second_past, r['_created_at'])