Guard against improper drops

I have destroyed a good bit of data so far because unit tests (correctly) dropped databases when they were done, but the config told it to drop the live database (incorrectly)

test/mongo_test.py

@@ -7,7 +7,7 @@ from metrik.targets.mongo import MongoTarget
 
 class MongoTest(TestCase):
     def setUp(self):
-        config = get_config()
+        config = get_config(is_test=True)
         self.client = MongoClient(
             host=config.get('metrik', 'mongo_host'),
             port=config.getint('metrik', 'mongo_port'))
@@ -15,7 +15,7 @@ class MongoTest(TestCase):
 
     def tearDown(self):
         super(MongoTest, self).tearDown()
-        config = get_config()
+        config = get_config(is_test=True)
         self.client.drop_database(config.get('metrik', 'mongo_database'))
 
 

test/test_conf.py

@@ -7,4 +7,14 @@ class ConfigurationTest(TestCase):
 
     def test_config_returns_values(self):
         config = get_config([])
-        assert config is not None
+        assert config is not None
+
+    def test_config_manual_test_instruction(self):
+        config = get_config()
+        self.assertEqual(config.get('metrik', 'mongo_database'), 'metrik')
+
+        config = get_config(is_test=False)
+        self.assertEqual(config.get('metrik', 'mongo_database'), 'metrik')
+
+        config = get_config(is_test=True)
+        self.assertEqual(config.get('metrik', 'mongo_database'), 'metrik-test')

test/test_merge.py

@@ -33,3 +33,14 @@ class MergeTest(MongoTest):
         assert item_retrieved is not None
         assert item_retrieved['string'] == item_string
 
+    def test_merge_is_nondestructive(self):
+        item1_id = self.db2[self.collection_name].save({})
+        item2_id = self.db[self.collection_name].save({})
+
+        assert len(list(self.db[self.collection_name].find())) == 1
+        assert len(list(self.db2[self.collection_name].find())) == 1
+
+        merge(self.client, self.client,
+              self.db.name, self.db2.name)
+        assert len(list(self.db[self.collection_name].find())) == 0
+        assert len(list(self.db2[self.collection_name].find())) == 2