modernize runtests to fix app loading

runtests.py

@@ -1,10 +1,13 @@
 #!/usr/bin/env python
+import django
+import os
+import sys
+from django.conf import settings
+from django.core.management import execute_from_command_line
+
 from django.conf import settings, global_settings as default_settings
 from django.core.management import call_command
 from os.path import dirname, realpath
-import django
-import sys
-import os
 
 
 # Give feedback on used versions
@@ -14,14 +17,10 @@ sys.stderr.write('Using Django version {0} from {1}\n'.format(
     os.path.dirname(os.path.abspath(django.__file__)))
 )
 
-
-# Detect location and available modules
-module_root = dirname(realpath(__file__))
-
-# Inline settings file
+if not settings.configured:
     settings.configure(
-    DEBUG = False,  # will be False anyway by DjangoTestRunner.
-    TEMPLATE_DEBUG = False,
+        DEBUG = True,
+        TEMPLATE_DEBUG = True,
         DATABASES = {
             'default': {
                 'ENGINE': 'django.db.backends.sqlite3',
@@ -42,19 +41,14 @@ settings.configure(
             'django.contrib.admin',
             'polymorphic',
         ),
+        MIDDLEWARE_CLASSES = (),
         SITE_ID = 3,
     )
 
-call_command('syncdb', verbosity=1, interactive=False)
 
+def runtests():
+    argv = sys.argv[:1] + ['test', 'polymorphic', '--traceback'] + sys.argv[1:]
+    execute_from_command_line(argv)
 
-# ---- app start
-verbosity = 2 if '-v' in sys.argv else 1
-
-from django.test.utils import get_runner
-TestRunner = get_runner(settings)  # DjangoTestSuiteRunner
-runner = TestRunner(verbosity=verbosity, interactive=True, failfast=False)
-failures = runner.run_tests(['polymorphic'])
-
-if failures:
-    sys.exit(bool(failures))
+if __name__ == '__main__':
+    runtests()