How to I specify Tinker to use a different database connection?

I have two database connections. One for my application and another for testing. In my ..\config\database.php

         'mysql' => [
            'driver'    => 'mysql',
            'host'      => env('DB_HOST', 'localhost'),
            'database'  => env('DB_DATABASE', 'forge'),
            'username'  => env('DB_USERNAME', 'forge'),
            'password'  => env('DB_PASSWORD', ''),
            'charset'   => 'utf8',
            'collation' => 'utf8_unicode_ci',
            'prefix'    => '',
            'strict'    => false,
        ],

        'testing' => [
            'driver'    => 'mysql',
            'host'      => env('DB_TEST_HOST', 'localhost'),
            'database'  => env('DB_TEST_DATABASE', 'forge'),
            'username'  => env('DB_TEST_USERNAME', 'forge'),
            'password'  => env('DB_TEST_PASSWORD', ''),
            'charset'   => 'utf8',
            'collation' => 'utf8_unicode_ci',
            'prefix'    => '',
            'strict'    => false,
        ],

I am able to change the database connection in seeding using

php artisan db:seed --database=testing

I wanted to use tinker for the connection 'testing' but unable to change it. Is there any way to change the database connection for tinker similar with database seeding?

via Chebli Mohamed