add 'TEST' into settings.py

django.py

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.postgresql_psycopg2',
        'NAME': 'user171030',
        'USER': 'user171030',
        'PASSWORD': 'user171030',
        'HOST': 'localhost',
        'PORT': '5432',
        # for testing views
        'TEST': {
            'NAME': 'backend_test',
        },
    }
}