cartalyst extensions' routes only set after first test - laravel

Please help I'm using Laravel 5.5 with Cartalyst Platform 7.0 and Phpunit 6.0. I have been trying a lot to install extensions in a testing environment but when the first test runs the extensions routes are not defined so the test returns 404. The second test and the rest of the tests pass because the routes now exist. If I echo(count(\Route::getRoutes())) the first test it is 11 and the rest it is 329.
TestCase
<?php
use Illuminate\Foundation\Testing\TestCase as BaseTestCase;
use Illuminate\Support\Facades\Artisan;
use Sentinel;
abstract class TestCase extends BaseTestCase
{
use TestData, CreatesApplication;
public function setUp()
{
parent::setUp();
$this->app['Illuminate\Contracts\Http\Kernel']->disableMiddleware();
Sentinel::getUserRepository()->setModel(\App\Models\User::class);
Sentinel::getPersistenceRepository()->setUsersModel(\App\Models\User::class);
$this->setUpDatabase();
}
protected function setUpDatabase()
{
Artisan::call('migrate');
Artisan::call('extension:install');
Artisan::call('extension:enable');
}
}

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I am relatively new to testing so please forgive me if this a stupid question.
All my tests are failing after I added a ViewServiceProvider to share data with the views.
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Edit
It makes total sense what #Donkarnash said but it's also confusing because according to the docs:
So, what if we need to register a view composer within our service provider? This should be done within the boot method. This method is called after all other service providers have been registered, meaning you have access to all other services that have been registered by the framework
See https://laravel.com/docs/8.x/providers#the-boot-method
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$view->with('policies', Policy::all(['name', 'slug']));
}
}
Then I referenced the composer in the ViewServiceProvider
namespace App\Providers;
use App\Models\Policy;
use Illuminate\Support\ServiceProvider;
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My CreatesApplication file:
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I'm trying to create a simple test with Laravel. My test code is as below;
<?php
namespace Tests\Feature;
use Tests\TestCase;
use Illuminate\Foundation\Testing\WithFaker;
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Thanks!
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use Tests\TestCase;
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