Тесты на отсутствующие миграции

test_migrations.py

from django.apps import apps
from django.db.migrations.autodetector import MigrationAutodetector
from django.db.migrations.loader import MigrationLoader, MIGRATIONS_MODULE_NAME
from django.db.migrations.questioner import NonInteractiveMigrationQuestioner
from django.db.migrations.state import ProjectState
from django.test import override_settings, TestCase


class CustomMigrationLoader(MigrationLoader):

    @classmethod
    def migrations_module(cls, app_label):
        """Переопределено для отвязки от MIGRATION_MODULES из сеттингов."""
        app_package_name = apps.get_app_config(app_label).name
        return '%s.%s' % (app_package_name, MIGRATIONS_MODULE_NAME), False


class ConflictsMigrationsTestCase(TestCase):

    def testConflicts(self):
        """Проверяет наличие конфликтов."""
        loader = CustomMigrationLoader(connection=None)
        loader.build_graph()
        self.assertFalse(loader.detect_conflicts())


class ForgottenMigrationsTestCase(TestCase):
    """Проверка на забытые миграции."""

    @override_settings(LANGUAGE_CODE='en-us')
    def test_missing_migrations(self):
        """Имеющиеся миграции актуальны для текущих моделей."""
        loader = CustomMigrationLoader(connection=None)
        loader.build_graph()
        loader_state = loader.project_state()
        check_apps = apps.app_configs.keys()

        autodetector = MigrationAutodetector(
            loader_state,
            ProjectState.from_apps(apps),
            NonInteractiveMigrationQuestioner(dry_run=True)
        )
        changes = autodetector.changes(loader.graph, check_apps)

        self.assertFalse(changes.keys())