app/tests/Feature/RegistrationTest.php

<?php

namespace Tests\Feature;

use Tests\TestCase;
use App\Models\Planner;
use Illuminate\Foundation\Testing\RefreshDatabase;

class RegistrationTest extends TestCase
{
    use RefreshDatabase;

    public function test_registration_screen_can_be_rendered()
    {
        $response = $this->get('/register');
        
        $response->assertStatus(200);
        $response->assertViewIs('auth.register');
        $response->assertSee('Register');
    }

    public function test_new_users_can_register()
    {
        $response = $this->post('/register', [
            'name' => 'Test User',
            'email' => 'test@example.com',
            'password' => 'password',
            'password_confirmation' => 'password',
        ]);

        $this->assertAuthenticated();
        $response->assertRedirect('/dashboard');
        
        // Check user was created
        $this->assertDatabaseHas('planners', [
            'email' => 'test@example.com',
            'name' => 'Test User',
        ]);
    }

    public function test_registration_fails_with_existing_email()
    {
        $existingUser = Planner::factory()->create([
            'email' => 'existing@example.com',
        ]);

        $response = $this->post('/register', [
            'name' => 'Another User',
            'email' => 'existing@example.com',
            'password' => 'password',
            'password_confirmation' => 'password',
        ]);

        $response->assertRedirect();
        $response->assertSessionHasErrors('email');
        $this->assertGuest();
    }

    public function test_registration_fails_with_password_mismatch()
    {
        $response = $this->post('/register', [
            'name' => 'Test User',
            'email' => 'test@example.com',
            'password' => 'password',
            'password_confirmation' => 'different',
        ]);

        $response->assertRedirect();
        $response->assertSessionHasErrors('password');
        $this->assertGuest();
        
        // Check user was not created
        $this->assertDatabaseMissing('planners', [
            'email' => 'test@example.com',
        ]);
    }
}