Add bugtag permissions required for working on kiwitcms#1597

Model: `bugs.Bug`
Permissions added:
* `'bugs.add_bugtag'`
* `'bugs.delete_bugtag'`

tcms/bugs/migrations/0003_add_bugtag_permissions.py

@@ -0,0 +1,21 @@
+# Generated by Django 3.0.3 on 2020-05-25 16:29
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('bugs', '0002_add_permissions'),
+    ]
+
+    operations = [
+        migrations.AlterModelOptions(
+            name='bug',
+            options={
+                'permissions': (
+                    ('add_bugtag', 'can add bug tag'), ('delete_bugtag', 'can delete bug tag')
+                )
+            },
+        ),
+    ]

tcms/bugs/models.py

@@ -5,6 +5,7 @@
 from django.conf import settings
 from django.db import models
 from django.urls import reverse
+from django.utils.translation import gettext_lazy as _
 
 from tcms.core.models.base import UrlMixin
 
@@ -32,6 +33,12 @@ class Bug(models.Model, UrlMixin):
     executions = models.ManyToManyField('testruns.TestExecution', related_name='bugs')
     tags = models.ManyToManyField('management.Tag', related_name='bugs')
 
+    class Meta:
+        permissions = (
+            ('add_bugtag', _('can add bug tag')),
+            ('delete_bugtag', _('can delete bug tag')),
+        )
+
     def __str__(self):
         return "BUG-%d: %s " % (self.pk, self.summary)
 

tcms/bugs/tests/test_models.py

@@ -6,6 +6,7 @@
 if 'tcms.bugs.apps.AppConfig' not in settings.INSTALLED_APPS:
     raise unittest.SkipTest('tcms.bugs is disabled')
 
+from django.contrib.auth.models import Permission       # noqa: E402
 from django.template.loader import render_to_string     # noqa: E402
 from django.test import TestCase                        # noqa: E402
 from django.utils.translation import gettext_lazy as _  # noqa: E402
@@ -47,3 +48,11 @@ def test_no_notification_if_assignee_not_set(self, send_mail):
         BugFactory(assignee=None)
 
         self.assertFalse(send_mail.called)
+
+
+class TestBugTagPermissions(TestCase):
+    def test_add_bugtag(self):
+        self.assertTrue(Permission.objects.filter(codename='add_bugtag'))
+
+    def test_delete_bugtag(self):
+        self.assertTrue(Permission.objects.filter(codename='delete_bugtag'))