laravel with codeception unitTesting : can't check relation

I want to unittest hasMany belongsTo&more method.

environment　

• laravel 5.0.33
• codeception 2.0.16
  

example
app/User.php

public function user()
{
    return $this->hasMany('\App\Users', 'name', 'user');
}

what would be a good way to do it?

via Chebli Mohamed