[IMP] base_comment_template multi company rules

[IMP] Move comment_template_id from account_invoice_comment_template and make it company_dependant

[IMP] base_comment_template: Add test

base_comment_template/tests/__init__.py

@@ -0,0 +1,2 @@
+# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl).
+from . import test_base_comment_template

base_comment_template/tests/test_base_comment_template.py

@@ -0,0 +1,21 @@
+# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl).
+from odoo.tests.common import TransactionCase
+
+
+class TestResPartner(TransactionCase):
+
+    def setUp(self):
+        self.template_id = self.env['base.comment.template'].create({
+            'name': 'Comment before lines',
+            'position': 'before_lines',
+            'text': 'Text before lines',
+        })
+
+    def test_commercial_partner_fields(self):
+        # Azure Interior
+        partner_id = self.env.ref('base.res_partner_12')
+        partner_id.property_comment_template_id = self.template_id.id
+        # Test childs propagation of commercial partner field
+        for child_id in partner_id.child_ids:
+            self.assertEqual(
+                child_id.property_comment_template_id == self.template_id)