Negative Testing with PHP-SDK

[jvjvjv]

General information

• SDK/Library version: 1.13.0
• Environment: Sandbox
• PayPal-Debug-ID values: n/a
• Language, language version, and OS: PHP 5.6.x, OS X, Linux

Issue description

I don't know how to perform negative testing with Payments API. As a note, I am using Reference Transactions. Here is some sample code to start.

$this->paypalContext = new ApiContext(
    new OAuthTokenCredential($client_id,$client_secret)
);
$this->paypalContext->setConfig([
    'mode' => ('sandbox'),
]);
$payment_api = new PayPalPayment(json_decode('{"intent":"sale","payer":{"payment_method":"paypal","funding_instruments":[{"billing":{"billing_agreement_id":"B-BILLINGAGREEMENT"}}]},"transactions":[{"amount":{"total":9.99,"currency":"USD"},"item_list":{"items":[{"name":"My item","sku":"ECH9272RHD","quantity":1,"price":"9.99","currency":"USD","url":"http:\/\/website.com\/item\/17827\/item-description"}]},"reference_id":"order-181367","description":"Order #181367"}]}');
$this->paypalContext->addRequestHeader("PayPal-Mock-Response",'{"mock_application_codes":"INSTRUMENT_DECLINED"}');
$result = $payment_api->create($this->paypalContext);

Running this throws the exception:

exception 'PayPal\Exception\PayPalConnectionException' with message 'Got Http response code 404 when accessing https://api.sandbox.paypal.com/v1/oauth2/token.' in /www/vendor/paypal/rest-api-sdk-php/lib/PayPal/Core/PayPalHttpConnection.php:202

When I remove the $this->paypalContext->addRequestHeader() line, it runs without a hitch. The main problem is, when creating a payment with a reference transaction, as soon as it is created it appears to be executed, so I do not see any way to inject the negative test header using the PHP SDK.

As the SDK documentation on PayPalConnectionException does not really provide any useful information, I must trigger a negative test to see and parse the error properly in my app.

Can you help out with this?

[magkopian]

I have the same issue but I did find a workaround, the problem comes from the fact that the create method of the Payment class sets the headers to null when it calls executeCall. Here is the related code from the Payment class,

public function create($apiContext = null, $restCall = null)
    {
        $payLoad = $this->toJSON();
        $json = self::executeCall(
            "/v1/payments/payment",
            "POST",
            $payLoad,
            null,
            $apiContext,
            $restCall
        );
        $this->fromJson($json);
        return $this;
    }

My workaround was to create a mock class which extends Payment and overrides the create, and use that in my test code instead of Payment.

<?php

use PayPal\Api\Payment;

class MockPayment extends Payment {

	public function create($apiContext = null, $restCall = null)
	{
		$payLoad = $this->toJSON();
		$json = self::executeCall(
			"/v1/payments/payment",
			"POST",
			$payLoad,
			['PayPal-Mock-Response' => '{"mock_application_codes":"MALFORMED_REQUEST"}'],
			$apiContext,
			$restCall
		);
		$this->fromJson($json);
		return $this;
	}

}

Doing so resulted to receiving a MALFORMED_REQUEST error with an HTTP status code of 400 as expected, instead of 404 like I did previously.