[ADD] contract_digitized_signature (#102)

* [ADD] contract_digitized_signature

* Correct README and add signature_name

* Change to char field

* Improve tests to acchieve full coverage

contract_digitized_signature/tests/test_contract_tracking.py

@@ -0,0 +1,23 @@
+# -*- coding: utf-8 -*-
+# Copyright 2017 Tecnativa - Vicent Cubells
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+
+from openerp.tests import common
+
+
+class TestContractSignatureTracking(common.SavepointCase):
+    @classmethod
+    def setUpClass(cls):
+        super(TestContractSignatureTracking, cls).setUpClass()
+        # Simple 1x1 transparent base64 encoded GIF
+        cls.image = 'R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw=='
+
+    def test_contract_signature_tracking(self):
+        self.contract = self.env['account.analytic.account'].create({
+            'name': 'Test Contract',
+            'customer_signature': self.image,
+        })
+        message = self.env['mail.message'].search([
+            ('res_id', '=', self.contract.id)
+        ], order='id desc', limit=1)
+        self.assertIn('Signature has been created.', message.body)