How to unit test cron jobs in Laravel?

I created a cron job to send notification emails. Cron job is working perfectly.

I need to test the cron job using the unit test. How can I write a unit test to check user data is existing or not?

I tried to implement a unit test for a cron job, but it is not working. I didn't try the unit test before. Any help would be appreciated.

I am using Laravel6.

Database Name = cronjob, Database username = homestead, Database password = secret

I created .env.testing file in root folder

##phpunit.xml

<server name="DB_CONNECTION" value="mysql"/>
<server name="DB_DATABASE" value=":memory:"/>

tests/Feature/EmailNotVerifiedCmdTest.php

public function testConsoleCommand()
{ 
  // Here I want to check user details are available or not
 // I don't want to check email sent or not. 

  $this->artisan('followUpNotification:EmailNotVerified');
  $this->assertTrue(true);
}

app/Console/Commands/EmailNotVerifiedCommand.php

protected $signature = 'followUpNotification:EmailNotVerified';

public function handle()
{
   $users = User::whereNull('email_verified_at')->get();

   // Sending notification emails to users.

}