Converts $options to array if parameter it's a FilterInterface instance on Vonage\Numbers\Client::searchAvailable() (#255)

* When options parameter on Vonage\Numbers\Client::searchAvailable()  is an instance of FilterInterface, it converts to array
* Added unit test

Author: leonardomaier

src/Numbers/Client.php

@@ -193,6 +193,10 @@ public function searchAvailable($country, $options = []) : array
             'index' => 'integer'
         ];
 
+        if ($options instanceof FilterInterface) {
+            $options = $options->getQuery();
+        }
+
         $options = $this->parseParameters($possibleParameters, $options);
         $options = new AvailableNumbers($options);
         $api = $this->getApiResource();

test/Numbers/ClientTest.php

@@ -18,6 +18,7 @@
 use VonageTest\Psr7AssertionTrait;
 use Vonage\Client\Exception\Request;
 use Psr\Http\Message\RequestInterface;
+use Vonage\Numbers\Filter\AvailableNumbers;
 
 class ClientTest extends TestCase
 {
@@ -213,6 +214,26 @@ public function testSearchAvailablePassesThroughWhitelistedOptions()
         @$this->numberClient->searchAvailable('US', $options);
     }
 
+    public function testSearchAvailableAcceptsFilterInterfaceOptions()
+    {
+        $options = new AvailableNumbers([
+            'pattern' => '1',
+            'search_pattern' => 2,
+            'features' => 'SMS,VOICE',
+            'size' => 100,
+            'index' => 19
+        ]);
+
+        $this->vonageClient->send(Argument::that(function (RequestInterface $request) {
+            $this->assertEquals('/number/search', $request->getUri()->getPath());
+            $this->assertEquals('rest.nexmo.com', $request->getUri()->getHost());
+            $this->assertEquals('GET', $request->getMethod());
+            return true;
+        }))->willReturn($this->getResponse('available-numbers'));
+
+        @$this->numberClient->searchAvailable('US', $options);
+    }
+
     /**
      * Make sure that unknown parameters fail validation
      */