Access Django Test Database

I have an API running on Heroku and would like to be able to test it using the test database. My problem I have is that the TestCase setUp(self) method adds the data to an automatically created test database. Then my tests send a POST request to the locally running version of itself. That code then is just using the regular default database instead of the test database the tests are running in.

Here's some code and what I've tried.

In my main settings.py I have named my database like so

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.sqlite3',
        'NAME': 'theOneTrueDB',
    }
}

And I read here (https://docs.djangoproject.com/en/3.0/topics/testing/overview/#the-test-database) that

The default test database names are created by prepending test_ to the value of each NAME in DATABASES.

So I figured in my views file for one of my apps I could just do Tenant.objects.using('test_theOneTrueDB').all() and that would work but it says

django.db.utils.ConnectionDoesNotExist: The connection test_theOneTrueDB doesn't exist

I have also tried

Tenant.objects.using('test_default')

and many other things. I am lost. I would also be okay with setting up another database and then using that in the setup with

Tenant.objects.save(using='theOneTrueDBTest)

or something like that.

Any help would be appreciated!