1 files changed, 110 insertions, 0 deletions
diff --git a/tests/app_loading/tests.py b/tests/app_loading/tests.py
new file mode 100644
index 0000000000..6dd0be2194
--- /dev/null
+++ b/tests/app_loading/tests.py
@@ -0,0 +1,110 @@
+from __future__ import absolute_import
+
+import copy
+import os
+import sys
+import time
+
+from django.conf import Settings
+from django.db.models.loading import cache, load_app, get_model, get_models
+from django.utils._os import upath
+from django.utils.unittest import TestCase
+
+class EggLoadingTest(TestCase):
+
+    def setUp(self):
+        self.old_path = sys.path[:]
+        self.egg_dir = '%s/eggs' % os.path.dirname(upath(__file__))
+
+        # This test adds dummy applications to the app cache. These
+        # need to be removed in order to prevent bad interactions
+        # with the flush operation in other tests.
+        self.old_app_models = copy.deepcopy(cache.app_models)
+        self.old_app_store = copy.deepcopy(cache.app_store)
+
+    def tearDown(self):
+        sys.path = self.old_path
+        cache.app_models = self.old_app_models
+        cache.app_store = self.old_app_store
+
+    def test_egg1(self):
+        """Models module can be loaded from an app in an egg"""
+        egg_name = '%s/modelapp.egg' % self.egg_dir
+        sys.path.append(egg_name)
+        models = load_app('app_with_models')
+        self.assertFalse(models is None)
+
+    def test_egg2(self):
+        """Loading an app from an egg that has no models returns no models (and no error)"""
+        egg_name = '%s/nomodelapp.egg' % self.egg_dir
+        sys.path.append(egg_name)
+        models = load_app('app_no_models')
+        self.assertTrue(models is None)
+
+    def test_egg3(self):
+        """Models module can be loaded from an app located under an egg's top-level package"""
+        egg_name = '%s/omelet.egg' % self.egg_dir
+        sys.path.append(egg_name)
+        models = load_app('omelet.app_with_models')
+        self.assertFalse(models is None)
+
+    def test_egg4(self):
+        """Loading an app with no models from under the top-level egg package generates no error"""
+        egg_name = '%s/omelet.egg' % self.egg_dir
+        sys.path.append(egg_name)
+        models = load_app('omelet.app_no_models')
+        self.assertTrue(models is None)
+
+    def test_egg5(self):
+        """Loading an app from an egg that has an import error in its models module raises that error"""
+        egg_name = '%s/brokenapp.egg' % self.egg_dir
+        sys.path.append(egg_name)
+        self.assertRaises(ImportError, load_app, 'broken_app')
+        try:
+            load_app('broken_app')
+        except ImportError as e:
+            # Make sure the message is indicating the actual
+            # problem in the broken app.
+            self.assertTrue("modelz" in e.args[0])
+
+
+class GetModelsTest(TestCase):
+    def setUp(self):
+        from .not_installed import models
+        self.not_installed_module = models
+
+
+    def test_get_model_only_returns_installed_models(self):
+        self.assertEqual(
+            get_model("not_installed", "NotInstalledModel"), None)
+
+
+    def test_get_model_with_not_installed(self):
+        self.assertEqual(
+            get_model(
+                "not_installed", "NotInstalledModel", only_installed=False),
+            self.not_installed_module.NotInstalledModel)
+
+
+    def test_get_models_only_returns_installed_models(self):
+        self.assertFalse(
+            "NotInstalledModel" in
+            [m.__name__ for m in get_models()])
+
+
+    def test_get_models_with_app_label_only_returns_installed_models(self):
+        self.assertEqual(get_models(self.not_installed_module), [])
+
+
+    def test_get_models_with_not_installed(self):
+        self.assertTrue(
+            "NotInstalledModel" in [
+                m.__name__ for m in get_models(only_installed=False)])
+
+
+class NotInstalledModelsTest(TestCase):
+    def test_related_not_installed_model(self):
+        from .not_installed.models import NotInstalledModel
+        self.assertEqual(
+            set(NotInstalledModel._meta.get_all_field_names()),
+            set(["id", "relatedmodel", "m2mrelatedmodel"]))