Merged regressiontests and modeltests into the test root.

tests/empty/models.py

@@ -0,0 +1,12 @@
+"""
+40. Empty model tests
+
+These test that things behave sensibly for the rare corner-case of a model with
+no fields.
+"""
+
+from django.db import models
+
+
+class Empty(models.Model):
+    pass

tests/empty/no_models/tests.py

@@ -0,0 +1,6 @@
+from django.test import TestCase
+
+
+class NoModelTests(TestCase):
+    """ A placeholder test case. See modeltests.empty.tests for more info. """
+    pass

tests/empty/tests.py

@@ -0,0 +1,38 @@
+from __future__ import absolute_import
+
+from django.core.exceptions import ImproperlyConfigured
+from django.db.models.loading import get_app
+from django.test import TestCase
+from django.test.utils import override_settings
+from django.utils import six
+
+from .models import Empty
+
+
+class EmptyModelTests(TestCase):
+    def test_empty(self):
+        m = Empty()
+        self.assertEqual(m.id, None)
+        m.save()
+        Empty.objects.create()
+        self.assertEqual(len(Empty.objects.all()), 2)
+        self.assertTrue(m.id is not None)
+        existing = Empty(m.id)
+        existing.save()
+
+
+class NoModelTests(TestCase):
+    """
+    Test for #7198 to ensure that the proper error message is raised
+    when attempting to load an app with no models.py file.
+
+    Because the test runner won't currently load a test module with no
+    models.py file, this TestCase instead lives in this module.
+
+    It seemed like an appropriate home for it.
+    """
+    @override_settings(INSTALLED_APPS=("modeltests.empty.no_models",))
+    def test_no_models(self):
+        with six.assertRaisesRegex(self, ImproperlyConfigured,
+                    'App with label no_models is missing a models.py module.'):
+            get_app('no_models')