Wie führen Sie alle tests mit python manage.py test-Befehl in django

Arbeite ich an einem django-Projekt, in dem ich mehrere apps. Jede app hat tests-Verzeichnis die test für das gesamte Projekt. Meine Verzeichnisstruktur ist wie folgt.

Project
      App_1
           tests
               __init__.py
               tests_views.py
      App_2
           tests
               __init__.py
               tests_views.py
      settings.py
      manage.py

Ich kann tests ausführen, wie diese

python manage.py test-App_1.tests

laufen alle tests in App_1/tests/test_views.py. Aber ich habe, dies zu tun für alle app-in meinem Projekt. Ich will einen einzigen Befehl die Ausführung aller tests in allen apps in meinem Projekt. Ich habe versucht, durch laufen

python manage.py test

aber ich bekam folgenden Fehler

Traceback (most recent call last):
  File "manage.py", line 9, in <module>
    execute_from_command_line(sys.argv)
  File "/srv/www/project/shared/env/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 338, in execute_from_command_line
    utility.execute()
  File "/srv/www/project/shared/env/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 330, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/srv/www/project/shared/env/local/lib/python2.7/site-packages/django/core/management/commands/test.py", line 30, in run_from_argv
    super(Command, self).run_from_argv(argv)
  File "/srv/www/project/shared/env/local/lib/python2.7/site-packages/django/core/management/base.py", line 390, in run_from_argv
    self.execute(*args, **cmd_options)
  File "/srv/www/project/shared/env/local/lib/python2.7/site-packages/django/core/management/commands/test.py", line 74, in execute
    super(Command, self).execute(*args, **options)
  File "/srv/www/project/shared/env/local/lib/python2.7/site-packages/django/core/management/base.py", line 441, in execute
    output = self.handle(*args, **options)
  File "/srv/www/project/shared/env/local/lib/python2.7/site-packages/django/core/management/commands/test.py", line 90, in handle
    failures = test_runner.run_tests(test_labels)
  File "/srv/www/project/shared/env/local/lib/python2.7/site-packages/django/test/runner.py", line 209, in run_tests
    suite = self.build_suite(test_labels, extra_tests)
  File "/srv/www/project/shared/env/local/lib/python2.7/site-packages/django/test/runner.py", line 150, in build_suite
    tests = self.test_loader.discover(start_dir=label, **kwargs)
  File "/usr/lib/python2.7/unittest/loader.py", line 204, in discover
    tests = list(self._find_tests(start_dir, pattern))
  File "/usr/lib/python2.7/unittest/loader.py", line 285, in _find_tests
    for test in self._find_tests(full_path, pattern):
  File "/usr/lib/python2.7/unittest/loader.py", line 265, in _find_tests
    raise ImportError(msg % (mod_name, module_dir, expected_dir))
ImportError: 'tests' module incorrectly imported from '/vagrant/code/project/App_1/tests'. Expected '/vagrant/code/project/App_1'. Is this module globally installed?

Kann irgend jemand sagt mir, wie kann ich alle tests in meiner app mit einem einzigen Befehl?