Move the upload/download sqlite3 file logic to a manager

Also add a factory method so the manager can be controlled via config

tests/test_full_sync.py

@@ -0,0 +1,44 @@
+# -*- coding: utf-8 -*-
+
+import os
+import unittest
+import configparser
+
+from ankisyncd.full_sync import FullSyncManager, get_full_sync_manager
+
+import helpers.server_utils
+
+class FakeFullSyncManager(FullSyncManager):
+    def __init__(self, config):
+        pass
+
+class BadFullSyncManager:
+    pass
+
+class FullSyncManagerFactoryTest(unittest.TestCase):
+    def test_get_full_sync_manager(self):
+        # Get absolute path to development ini file.
+        script_dir = os.path.dirname(os.path.realpath(__file__))
+        ini_file_path = os.path.join(script_dir,
+                                     "assets",
+                                     "test.conf")
+
+        # Create temporary files and dirs the server will use.
+        server_paths = helpers.server_utils.create_server_paths()
+
+        config = configparser.ConfigParser()
+        config.read(ini_file_path)
+
+        # Use custom files and dirs in settings. Should be PersistenceManager
+        config['sync_app'].update(server_paths)
+        self.assertTrue(type(get_full_sync_manager(config['sync_app']) == FullSyncManager))
+
+        # A conf-specified FullSyncManager is loaded
+        config.set("sync_app", "full_sync_manager", 'test_full_sync.FakeFullSyncManager')
+        self.assertTrue(type(get_full_sync_manager(config['sync_app'])) == FakeFullSyncManager)
+
+        # Should fail at load time if the class doesn't inherit from FullSyncManager
+        config.set("sync_app", "full_sync_manager", 'test_full_sync.BadFullSyncManager')
+        with self.assertRaises(TypeError):
+            pm = get_full_sync_manager(config['sync_app'])
+