'`makemigrations --dry-run` should not ask for defaults.'

def test_makemigrations_dry_run(self):

    class SillyModel(models.Model, ):
        silly_field = models.BooleanField(default=False)
        silly_date = models.DateField()
        class Meta:
            app_label = 'migrations'
    out = io.StringIO()
    with self.temporary_migration_module(module='migrations.test_migrations_no_default'):
        call_command('makemigrations', 'migrations', dry_run=True, stdout=out)
    self.assertIn('Add    field    silly_date    to    sillymodel', out.getvalue())
