public function testInvalidCredentials()
 {
     //    $this->expectException();
     Shippo::setApiKey('invalid');
     try {
         $address = Shippo_Address::create();
     } catch (Shippo_AuthenticationError $e) {
         $this->assertEqual(401, $e->getHttpStatus());
     }
 }
<?php

/* 
This example demonstrates how to purchase a label for a domestic US shipment.
*/
require_once 'lib/Shippo.php';
// Replace <API-KEY> with your credentials
Shippo::setApiKey("<API-KEY>");
// example fromAddress
$fromAddress = array('object_purpose' => 'PURCHASE', 'name' => 'Shippo Itle"', 'company' => 'Shippo', 'street1' => '215 Clayton St.', 'city' => 'San Francisco', 'state' => 'CA', 'zip' => '94117', 'country' => 'US', 'phone' => '+1 555 341 9393', 'email' => '*****@*****.**');
// example fromAddress
$toAddress = array('object_purpose' => 'PURCHASE', 'name' => 'Mr Hippo"', 'company' => 'San Diego Zoo"', 'street1' => '2920 Zoo Drive"', 'city' => 'San Diego', 'state' => 'CA', 'zip' => '92101', 'country' => 'US', 'phone' => '+1 555 341 9393', 'email' => '*****@*****.**');
// example parcel
$parcel = array('length' => '5', 'width' => '5', 'height' => '5', 'distance_unit' => 'in', 'weight' => '2', 'mass_unit' => 'lb');
// example Shipment object
$shipment = Shippo_Shipment::create(array('object_purpose' => 'PURCHASE', 'address_from' => $fromAddress, 'address_to' => $toAddress, 'parcel' => $parcel, 'submission_type' => 'PICKUP', 'insurance_amount' => '30', 'insurance_currency' => 'USD'));
// Wait for rates to be generated
$ratingStartTime = time();
while ($shipment["object_status"] == "QUEUED" || $shipment["object_status"] == "WAITING") {
    $shipment = Shippo_Shipment::retrieve($shipment["object_id"]);
    usleep(200000);
    //sleeping 200ms
    if (time() - $ratingStartTime > 25) {
        break;
    }
}
// Get all rates for shipment.
$rates = Shippo_Shipment::get_shipping_rates(array('id' => $shipment["object_id"]));
// Get the first rate from the rates results
$rate = $rates["results"][0];
// Purchase the desired rate
 /**
  * Bootstrap the application events.
  *
  * @return void
  */
 public function boot()
 {
     \Shippo::setApiKey(env('SHIPPO_API_KEY'));
 }
 function setUp()
 {
     Shippo::setApiKey('dW5pdHRlc3Q6dW5pdHRlc3Q=');
 }
 public function testSetApiKey()
 {
     Shippo::setApiKey('dW5pdHRlc3Q6dW5pdHRlc3Q=');
     $this->assertEqual(Shippo::getApiKey(), 'dW5pdHRlc3Q6dW5pdHRlc3Q=');
 }