validation fix

Author: msztorc

src/DPDService.php

@@ -166,7 +166,7 @@ public function createPackage(array $parcels, array $receiver, $payer = 'SENDER'
         else
             $ref = str_split($ref, 9);
 
-        if (strtoupper($payer) != 'SENDER' || strtoupper($payer) != 'RECEIVER')
+        if (strtoupper($payer) != 'SENDER' && strtoupper($payer) != 'RECEIVER')
             throw new \Exception('Wrong payer type (SENDER or RECEIVER)', 104);
 
         $package = [

tests/unit/ServicesTest.php

@@ -83,7 +83,7 @@ public function test_add_package()
 
         //send package
         $result = $dpd->sendPackage($this->parcels, $this->receiver, 'SENDER');
-        $this->assertTrue(isset($result->parcels) && count($result->parcels) == 2);     
+        $this->assertTrue(isset($result->parcels) && !is_null($result->parcels) && count($result->parcels) == 2);     
 
         // generate speedlabel in default, pdf/a4 format
         $speedlabel = $dpd->generateSpeedLabelsByPackageIds([$result->packageId], $this->pickupAddress);