Add isolated testing settings for awx testing

awx/main/tests/settings_for_isolated_testing.py

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+"""
+AWX Settings for Isolated Testing
+
+This settings module provides a fully isolated testing environment that:
+- Uses SQLite instead of PostgreSQL for faster, isolated test runs
+- Disables DAB (django-ansible-base) resource sync to prevent 401 errors
+- Mocks DAB ServiceID dependencies to avoid database table requirements
+- Provides in-memory caching for test isolation
+
+Usage:
+    pytest --ds=awx.main.tests.settings_for_isolated_testing [test_file]
+
+Enhanced Usage Notes:
+1. ServiceID Mocking Pattern:
+   Sample fixture code pattern to add to test files to prevent: "AttributeError: 'NoneType' object has no attribute 'pk'"
+
+   # Mock the service_id field default for testing when DAB resource registry tries to access ServiceID.objects.first().pk
+   @pytest.fixture(autouse=True)
+   def mock_dab_service_id():
+       from django.conf import settings
+       import uuid
+
+       if getattr(settings, 'MOCK_DAB_SERVICE_ID', False):
+           with patch('ansible_base.resource_registry.models.service_identifier.ServiceID.objects.first') as mock_first:
+               mock_service = MagicMock()
+               mock_service.pk = uuid.uuid4()
+               mock_first.return_value = mock_service
+               yield
+       else:
+           yield
+
+   - MOCK_DAB_SERVICE_ID setting to enable/disable mocking
+
+2. DAB Resource Server Isolation:
+   - RESOURCE_SERVER = {} setting disables DAB sync during testing
+   - Prevents 401 authentication errors in test environments
+
+3. SQLite Testing Configuration:
+   - Fast, isolated test database setup
+   - No PostgreSQL permissions or setup required
+
+AIA: Primarily AI, New content, Human-initiated, Reviewed, Claude (Anthropic AI) via Claude Code
+AIA PAI Nc Hin R Claude Code - https://aiattribution.github.io/interpret-attribution
+"""
+
+# Python
+import uuid
+
+# Load development settings for base variables.
+from awx.settings.development import *  # NOQA
+
+# Some things make decisions based on settings.SETTINGS_MODULE, so this is done for that
+SETTINGS_MODULE = 'awx.settings.development'
+
+# Turn off task submission, because sqlite3 does not have pg_notify
+DISPATCHER_MOCK_PUBLISH = True
+
+# Use SQLite for unit tests instead of PostgreSQL.  If the lines below are
+# commented out, Django will create the test_awx-dev database in PostgreSQL to
+# run unit tests.
+CACHES = {'default': {'BACKEND': 'django.core.cache.backends.locmem.LocMemCache', 'LOCATION': 'unique-{}'.format(str(uuid.uuid4()))}}
+DATABASES = {
+    'default': {
+        'ENGINE': 'django.db.backends.sqlite3',
+        'NAME': os.path.join(BASE_DIR, 'awx.sqlite3'),  # noqa
+        'TEST': {
+            # Test database cannot be :memory: for inventory tests.
+            'NAME': os.path.join(BASE_DIR, 'awx_test.sqlite3')  # noqa
+        },
+    }
+}
+
+# Disable DAB resource sync to Resource Server for testing
+# This prevents 401 errors when creating RoleUserAssignment objects in tests
+# Set empty dict to disable sync (code checks for URL key)
+RESOURCE_SERVER = {}
+
+# This flag enables DAB ServiceID mocking in test files via autouse fixtures (see block comment above)
+MOCK_DAB_SERVICE_ID = True