Fix undefined status_code

Author: pimlie

src/PrestashopWebServiceLibrary.php

@@ -97,7 +97,7 @@ protected function checkRequest($request)
             throw new PrestashopWebServiceRequestException($messages[$request['status_code']], $request['status_code'], $xml);
         } else {
             $exception = 'This call to PrestaShop Web Services returned an unexpected HTTP status of: ';
-            $exception.= $status_code;
+            $exception.= $request['status_code'];
             throw new PrestashopWebServiceException($exception);
         }
     }

tests/PrestashopWebServiceTest.php

@@ -54,6 +54,21 @@ public function it_throws_exception_on_404()
         }
     }
 
+    /** @test */
+    public function it_throws_exception_on_unknown_http_status()
+    {
+        $ps = $this->getMockedLibrary('executeRequest', [
+                'status_code' => 999,
+                'response' => '<?xml version="1.0" encoding="UTF-8"?>
+<prestashop xmlns:xlink="http://www.w3.org/1999/xlink">
+</prestashop>',
+                'header' => ''
+            ]);
+
+        $this->expectExceptionMessage('unexpected HTTP status of: 999', PrestashopWebServiceException::class);
+        $xml = $ps->get(['resource' => 'categories']);
+    }
+
     /** @test */
     public function it_throws_exception_on_empty_response()
     {