test: each app keeps its tests in a tests package

131 test modules sat next to the code they test; instances alone had
51 of them beside views.py and utils.py. They move into a
tests/ package per app, and the JavaScript checks into
webvirtcloud/tests/js. Each non-empty tests.py becomes tests/test_views.py;
the empty generated stubs are removed.

Imports of the app's own modules become absolute, paths built from
__file__ go one level up, the live helper is instances.tests.livetest,
and coverage omits */tests/*. The suite discovers the same 960 tests as
before.

appsettings/test_get_settings.py

@@ -1,36 +0,0 @@
-"""get_settings() runs on every request (middleware). A database error must not
-leave the loop reading an unbound variable (the old bare except did), and must
-not crash the request chain over a transient read."""
-
-from unittest.mock import patch
-
-from django.db import DatabaseError
-from django.test import TestCase
-
-from appsettings.models import AppSettings
-from appsettings.settings import app_settings, get_settings
-
-
-class GetSettingsTestCase(TestCase):
-    def test_a_database_error_does_not_raise(self):
-        app_settings.MARKER = "kept"
-        with patch("appsettings.settings.AppSettings.objects") as objects:
-            objects.all.side_effect = DatabaseError("db down")
-            get_settings()  # must not raise UnboundLocalError or DatabaseError
-        self.assertEqual(app_settings.MARKER, "kept")
-
-    def test_settings_are_loaded_when_the_database_works(self):
-        AppSettings.objects.update_or_create(key="TEST_MARKER_KEY", defaults={"name": "m", "value": "from-db"})
-        try:
-            get_settings()
-            self.assertEqual(app_settings.TEST_MARKER_KEY, "from-db")
-        finally:
-            if hasattr(app_settings, "TEST_MARKER_KEY"):
-                delattr(app_settings, "TEST_MARKER_KEY")
-
-    def test_a_query_that_fails_during_iteration_does_not_raise(self):
-        app_settings.MARKER2 = "kept"
-        with patch("appsettings.settings.AppSettings.objects") as objects:
-            objects.all.return_value.__iter__.side_effect = DatabaseError("cursor died")
-            get_settings()
-        self.assertEqual(app_settings.MARKER2, "kept")