public function testListCustomers()
{
$customer1 = $this->customers->createCustomer();
$customer2 = $this->customers->createCustomer();
$this->customers->createCustomer();
$this->customers->createCustomer();
$request = new ListRequest();
$request->setLimit(2);
$list = $this->customers->listCustomers($request);
$this->assertInstanceOf(Customers::LIST_CUSTOMERS_RESPONSE_CLASS, $list);
$this->assertEquals(2, sizeof($list->getData()));
$this->customers->deleteCustomer($customer1->getId());
$this->customers->deleteCustomer($customer2->getId());
}