NoDownMigrationsTest.php

<?php

namespace Tests\Unit\Style;

use Illuminate\Database\Migrations\Migrator;
use Illuminate\Foundation\Testing\RefreshDatabase;
use ReflectionClass;
use Tests\TestCase;

class NoDownMigrationsTest extends TestCase
{
    use RefreshDatabase;

    /** @test */
    public function there_are_no_down_migrations()
    {
        /** @var Migrator $migrator */
        $migrator = app('migrator');

        $files = $migrator->getMigrationFiles([
            $this->app->databasePath() . DIRECTORY_SEPARATOR . 'migrations'
        ]);

        $migrator->requireFiles($files);

        foreach ($files as $file) {
            $class = $migrator->resolve($migrator->getMigrationName($file));
            $reflector = new ReflectionClass($class);

            // We don't use down migrations because we don't want to ever run
            // `down` in prod, it's too dangerous. If anything from an old
            // migration needs to be undone, create a new migration for it.
            $this->assertFalse($reflector->hasMethod('down'), get_class($class) . ' migration has a down method. Please remove it.');
        }
    }
}