[IMP] base_external_dbsource: Refactor & Split by source

* Heavily refactor code for reusability
* Split all sources into independent modules
* Add more test coverage
* Add CRUD methods
* Add iterator execute return to roadmap

[UPD] Update base_external_dbsource_mssql.pot

base_external_dbsource_mssql/tests/__init__.py

@@ -0,0 +1,3 @@
+# -*- encoding: utf-8 -*-
+
+from . import test_base_external_dbsource

base_external_dbsource_mssql/tests/test_base_external_dbsource.py

@@ -0,0 +1,42 @@
+# -*- coding: utf-8 -*-
+# Copyright 2016 LasLabs Inc.
+
+import mock
+
+from odoo.tests import common
+
+
+ADAPTER = ('odoo.addons.base_external_dbsource_mssql.models'
+           '.base_external_dbsource.pymssql')
+
+
+class TestBaseExternalDbsource(common.TransactionCase):
+
+    def setUp(self):
+        super(TestBaseExternalDbsource, self).setUp()
+        self.dbsource = self.env.ref(
+            'base_external_dbsource_mssql.demo_mssql',
+        )
+
+    def test_connection_close_mssql(self):
+        """ It should close the connection """
+        connection = mock.MagicMock()
+        res = self.dbsource.connection_close_mssql(connection)
+        self.assertEqual(res, connection.close())
+
+    def test_connection_open_mssql(self):
+        """ It should call SQLAlchemy open """
+        with mock.patch.object(
+            self.dbsource, '_connection_open_sqlalchemy'
+        ) as parent_method:
+            self.dbsource.connection_open_mssql()
+            parent_method.assert_called_once_with()
+
+    def test_excecute_mssql(self):
+        """ It should pass args to SQLAlchemy execute """
+        expect = 'sqlquery', 'sqlparams', 'metadata'
+        with mock.patch.object(
+            self.dbsource, '_execute_sqlalchemy'
+        ) as parent_method:
+            self.dbsource.execute_mssql(*expect)
+            parent_method.assert_called_once_with(*expect)