A pytest script for Django projects, ensuring all model changes are captured in migrations by failing the test if any migrations are missing.

test__migrations.py

from io import StringIO

import pytest
from django.core.management import call_command


@pytest.mark.django_db
class TestMissingMigrations:
    error_message = (
        "\n\tMissing migrations detected. Please "
        "run `python manage.py makemigrations`"
    )

    def test_migrations(self):
        # GIVEN
        output = StringIO()

        # WHEN
        try:
            call_command("makemigrations", "--dry-run", stdout=output)
        except Exception:
            pytest.fail("Unable to determine missing migrations")
        value = output.getvalue()

        # THEN
        assert value == "No changes detected\n", self.error_message