Adding tests for check_migrations.

# encoding: utf8

from django.core import checks

from django.core.checks.migrations import check_migrations

from django.test import TestCase, override_settings

from .test_base import MigrationTestBase

class CheckMigrationTests(MigrationTestBase):

    """

    Test checks for unapplied migrations.

    """

    @override_settings(MIGRATION_MODULES={"migrations": "migrations.test_migrations"})

    def test_unapplied(self):

        """

        check_migrations should return a warning when there are unapplied migrations.

        """

        expected = [

            checks.Warning(

                "You have unapplied migrations; "

                "your app may not work properly until they are applied.",

                hint="Run 'python manage.py migrate' to apply them.",

            )

        ]

        errors = check_migrations()

        self.assertEqual(errors, expected)

    @override_settings(MIGRATION_MODULES={"migrations": "migrations.test_migrations"}, DATABASES={})

    def test_no_databases(self):

        """

        Migration checks should not consider unapplied migrations if there is

        no database configured.

        """

        errors = check_migrations()

        self.assertEqual(errors, [])

    def test_no_unapplied(self):

        """

        No warning should be issued if all migrations have been applied.

        """

        errors = check_migrations()

        self.assertEqual(errors, [])