Django TEST_MIRROR issue

test_mirror_issue.py

#! debug
ipdb> connections['default'].cursor().db.connection
<connection object at 0x10646d180; dsn: 'dbname=test_master', closed: 0>
ipdb> connections['prestashop'].cursor().db.connection
<connection object at 0x10670d3e0; dsn: 'dbname=test_master', closed: 0>

#! settings
DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.postgresql_psycopg2',
        'NAME': 'master',
        'USER': '',
        'PASSWORD': '',
    },
    'prestashop': {
        'NAME': 'slave',
        'ENGINE': 'django.db.backends.postgresql_psycopg2',
        'USER': '',
        'PASSWORD': '',
        'TEST': {
                'MIRROR' : 'default'
            }
    }
}