invoiceninja/database/factories/ProductFactory.php

<?php

use Faker\Generator as Faker;

$factory->define(App\Models\Product::class, function (Faker $faker) {
    return [
        'product_key' => $faker->text(7),
        'notes' => $faker->text(20),
        'cost' => $faker->numberBetween(1,1000),
        'price' => $faker->numberBetween(1,1000),
        'quantity' => $faker->numberBetween(1,100),
        'tax_name1' => 'GST',
        'tax_rate1' => 10,
        'tax_name2' => 'VAT',
        'tax_rate2' => 17.5,
        'custom_value1' => $faker->text(20),
        'custom_value2' => $faker->text(20),
        'custom_value3' => $faker->text(20),
        'custom_value4' => $faker->text(20),
        'is_deleted' => false,
    ];
});