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The problem in my case was, that I've overridden the default creation of test database by Django, when running the tests. This happened by obsolete pytest fixture that i had in my conftest.py. As @willeM_ Van Onsem confirmed, Django by default creates a test database by appending test_ to the name of your default to use database.

In order to check which database are you using, just add a print statement into a test case:

from django.db import connection
connection.settings_dict["NAME"]

This will NOT print your default database name, but will print the database name of the currently used database.

In my case, my database configuration ended up like:

DATABASES = {
    'default': {
        "NAME": "localDatabase",
        "ENGINE": "django.contrib.gis.db.backends.postgis",
        "USER": "test",
        "PASSWORD": "test",
        "HOST": "127.0.0.1",
        "PORT": "5432",
    },
}

and when running the tests, the currently used database name is - "test_localDatabase".

As you can see, I have removed the "TEST" key property from DATABASES , because it overrides the default Django logic of generating a new name for the test database.

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