Heroku won't allow me to rename DB and thus can't run Django unit tests?

I'm trying to run Django tests via python manage.py test --settings="app.test-settings"

Settings File Below

from settings import *
DATABASES = {
        'default': {
            'ENGINE': 'django.contrib.gis.db.backends.postgis',
            'NAME': 'dbname',
            'HOST': 'ec2-54-83-38-90.compute-1.amazonaws.com',
            'PORT': '5802',
            'USER': 'user',
            'PASSWORD': 'pass'
            }
    }

Problem Django keeps trying to create a db prepended with test_ but Heroku doesn't allow me to change the db name.

I can't use sqlite because I have modules that utilize the POSTGIS options of the db. Which through errors and kill the tests...

Is there a way to do this without blowing up the Django source code? As I'd need to get this to be able to run on CircleCI.

As always thanks!