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Factories

While developing your application, you will likely want to “stub” a subscription record in your application’s database so that calls to the $billable->subscribed() method return true. To accomplish this, you may add a “state” method to your billable model’s factory class. Typically, this will be your application’s UserFactory class. Below you will find an example state method implementation; however, you are free to adjust this to your application’s own needs: 
use App\Models\User;

/**
 * Indicate that the user should have a subscription plan.
 *
 * @return $this
 */
public function withSubscription(string|int $planId = null): static
{
    return $this->afterCreating(function (User $user) use ($planId) {
        $subscription = $user->subscriptions()->create([
            'name' => 'default',
            'stripe_id' => Str::random(10),
            'stripe_status' => 'active',
            'stripe_price' => $planId,
            'quantity' => 1,
            'trial_ends_at' => null,
            'ends_at' => null,
        ]);

        $subscription->items()->create([
            'stripe_id' => Str::random(10),
            'stripe_product' => Str::random(10),
            'stripe_price' => $planId,
            'quantity' => 1,
        ]);
    });
}
Once you have defined the state method, you may use it when creating models via your factory: 
$user = User::factory()->withSubscription('price_id')->create();

$user->subscribed(); // true