Start testing with the internal bug tracker disabled. Refs #1370

- all tests should be passign with and without this App
- specific tcms.bugs related tests should be skipped when the
  App is not found in INSTALLED_APPS

.travis.yml

@@ -49,6 +49,11 @@ jobs:
         - CMD=test
         - TEST_DB=SQLite
 
+    - env:
+        - CMD=test
+        - TEST_DB=SQLite
+        - DISABLE_INTERNAL_BUGTRACKER=yes
+
     - env:
         - CMD=test
         - TEST_DB=MariaDB

tcms/settings/test/__init__.py

@@ -32,3 +32,7 @@
 # for running localized tests, see f74c3c1
 # See https://code.djangoproject.com/ticket/29713
 LANGUAGE_CODE = os.environ.get('LANG', 'en-us').lower().replace('_', '-').split('.')[0]
+
+# for running tests with and without the internal bug-tracker
+if os.environ.get('DISABLE_INTERNAL_BUGTRACKER'):
+    INSTALLED_APPS.remove('tcms.bugs.apps.AppConfig')  # noqa: F405