AddOnTest.php

<?php
namespace Test\Unit;

require_once dirname(__DIR__) . '/Setup.php';

use Test\Setup;
use Braintree;

class AddOnTest extends Setup
{
    public function testFactory()
    {
        $addOn = Braintree\AddOn::factory([]);

        $this->assertInstanceOf('Braintree\AddOn', $addOn);
    }

    public function testToString()
    {
        $addOnParams = [
            "amount" => "100.00",
            "description" => "some description",
            "id" => "1",
            "kind" => "add_on",
            "name" => "php_add_on",
            "neverExpires" => "false",
            "numberOfBillingCycles" => "1"
        ];

        $addOn = Braintree\AddOn::factory($addOnParams);

        $this->assertEquals("Braintree\AddOn[amount=100.00, description=some description, id=1, kind=add_on, name=php_add_on, neverExpires=false, numberOfBillingCycles=1]", (string) $addOn);
    }
}