Removed test for migration check forgotten in 7e941ba6.

tests/migrations/test_checks.py

-# encoding: utf8
-from django.core import checks
-from django.core.checks.migrations import check_migrations
-from django.test import 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, [])