Modify validation to work in edge cases

src/Service/Account/Numbers.php

@@ -51,6 +51,10 @@ protected function validateResponse(array $json)
         if (!isset($json['count'])) {
             throw new Exception('count property expected');
         }
+        if (0 == $json['count']) {
+            // If there are no numbers on the account, stop validating.
+            return;
+        }
         if (!isset($json['numbers']) || !is_array($json['numbers'])) {
             throw new Exception('numbers array property expected');
         }
@@ -67,9 +71,6 @@ protected function validateResponse(array $json)
             if (!isset($number['features']) || !is_array($number['features'])) {
                 throw new Exception('number.features array property expected');
             }
-            if (!isset($number['moHttpUrl'])) {
-                throw new Exception('number.moHttpUrl property expected');
-            }
         }
     }
 }

src/Service/Account/Pricing/Country.php

@@ -34,7 +34,8 @@ public function invoke($country = null)
         }
 
         return new Entity\Pricing($this->exec([
-            'country' => $country,
+            // Nexmo API requires $country value to be uppercase.
+            'country' => strtoupper($country),
         ]));
     }
 
@@ -43,6 +44,10 @@ public function invoke($country = null)
      */
     protected function validateResponse(array $json)
     {
+        if (!isset($json['mt'])) {
+            // Some countries don't have any values, e.g., BV.
+            return;
+        }
         if (!isset($json['country'])) {
             throw new Exception('country property expected');
         }