[ADD] Unittest.

partner_children_navigation/__init__.py

@@ -1 +1,2 @@
 from . import models
+from . import tests

partner_children_navigation/models/res_partner.py

@@ -7,8 +7,6 @@ from odoo import api, fields, models
 class Partner(models.Model):
     _inherit = 'res.partner'
 
-    contact_origin = fields.Many2one('res.partner', string='Contact origin')
-
     @api.multi
     def open_commercial_partner(self):
         """

partner_children_navigation/tests/__init__.py

@@ -0,0 +1 @@
+from . import test_res_partner

partner_children_navigation/tests/test_res_partner.py

@@ -0,0 +1,33 @@
+# SDi
+# Copyright 2018 David Juaneda - <djuaneda@sdi.es>
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+from odoo.tests.common import TransactionCase
+
+
+class TestResPartnerNav(TransactionCase):
+
+    def setUp(self):
+        super(TestResPartnerNav, self).setUp()
+
+        res_partner = self.env['res.partner']
+        self.parent = res_partner.browse(
+            res_partner.name_create('IronShield')[0])
+
+        self.child = res_partner.create({
+            'name': 'Isen Hardearth',
+            'street': 'Strongarm Avenue, 12',
+            'parent_id': self.parent.id,
+        })
+
+    def test_open_commercial_partner(self):
+        """ This test case checks
+                - If the method redirects to the form view of the correct one
+                of an object of the 'res.partner' class.
+        """
+        for child in self.parent.child_ids:
+            action = child.open_commercial_partner()
+            print("Child_id = {}".format(child.id))
+            print("action.get('res_id') = {}".format(action.get('res_id')))
+            self.assertEqual(child.id, action.get('res_id'),
+                             'The contact ID from the partner must be equal to'
+                             ' the ID of the contact to be displayed.')