belongsToMany() Relationship Test I (User-Role) - Testing Model Relationships in Laravel

belongsToMany_test_1.php

<?php
namespace Tests\Unit;

use App\Role;
use App\User;
use Illuminate\Foundation\Testing\RefreshDatabase;
use Illuminate\Foundation\Testing\WithFaker;
use Illuminate\Support\Facades\Schema;
use Tests\TestCase;

class UserTest extends TestCase
{
    use RefreshDatabase, WithFaker;

    /** @test  */
    public function a_user_belongs_to_many_roles()
    {
        $user = factory(User::class)->create(); 
        $role = factory(Role::class)->create();

        $this->assertInstanceOf('Illuminate\Database\Eloquent\Collection', $user->roles); 
    }
}