diff --git a/Tests/Method/DetectorTest.php b/Tests/Method/DetectorTest.php
index 0478554..b1feaf8 100644
--- a/Tests/Method/DetectorTest.php
+++ b/Tests/Method/DetectorTest.php
@@ -28,13 +28,9 @@ protected function setUp()
     {
         $this->detector = $this->getMock(
             'Eko\GoogleTranslateBundle\Translate\Method\Detector',
-            ['getClient'],
-            ['fakeapikey']
+            null,
+            ['fakeapikey', $this->getClientMock()]
         );
-
-        $clientMock = $this->getClientMock();
-
-        $this->detector->expects($this->any())->method('getClient')->will($this->returnValue($clientMock));
     }
 
     /**
diff --git a/Tests/Method/LanguagesTest.php b/Tests/Method/LanguagesTest.php
index ae15c7d..75f0184 100644
--- a/Tests/Method/LanguagesTest.php
+++ b/Tests/Method/LanguagesTest.php
@@ -28,13 +28,9 @@ protected function setUp()
     {
         $this->languages = $this->getMock(
             'Eko\GoogleTranslateBundle\Translate\Method\Languages',
-            ['getClient'],
-            ['fakeapikey']
+            null,
+            ['fakeapikey', $this->getClientMock()]
         );
-
-        $clientMock = $this->getClientMock();
-
-        $this->languages->expects($this->any())->method('getClient')->will($this->returnValue($clientMock));
     }
 
     /**
diff --git a/Tests/Method/TranslatorTest.php b/Tests/Method/TranslatorTest.php
index 6929412..8dca3e8 100644
--- a/Tests/Method/TranslatorTest.php
+++ b/Tests/Method/TranslatorTest.php
@@ -28,13 +28,9 @@ protected function setUp()
     {
         $this->translator = $this->getMock(
             'Eko\GoogleTranslateBundle\Translate\Method\Translator',
-            ['getClient'],
-            ['fakeapikey', $this->getDetectorMock()]
+            null,
+            ['fakeapikey', $this->getClientMock(), $this->getDetectorMock()]
         );
-
-        $clientMock = $this->getClientMock();
-
-        $this->translator->expects($this->any())->method('getClient')->will($this->returnValue($clientMock));
     }
 
     /**
@@ -70,8 +66,7 @@ public function testPlainTextTranslate()
         // Then
         $this->assertEquals($value, "J'ai", 'Should return "J\'ai"');
     }
-    
-    
+
     /**
      * Test multiple translate method using an array.
      */
diff --git a/Translate/Method.php b/Translate/Method.php
index b049864..69b23e3 100644
--- a/Translate/Method.php
+++ b/Translate/Method.php
@@ -10,7 +10,7 @@
 
 namespace Eko\GoogleTranslateBundle\Translate;
 
-use GuzzleHttp\Client as GuzzleClient;
+use GuzzleHttp\ClientInterface;
 use Symfony\Component\Stopwatch\Stopwatch;
 use Symfony\Component\Stopwatch\StopwatchEvent;
 
@@ -29,7 +29,7 @@ class Method
     protected $apiKey = null;
 
     /**
-     * @var GuzzleClient A Guzzle client instance
+     * @var ClientInterface A Guzzle client instance
      */
     protected $client;
 
@@ -56,22 +56,21 @@ class Method
     /**
      * Method constructor.
      *
-     * @param string       $apiKey    API key retrieved from configuration
-     * @param GuzzleClient $client
-     * @param Stopwatch    $stopwatch Symfony profiler Stopwatch service
+     * @param string          $apiKey    API key retrieved from configuration
+     * @param ClientInterface $client
+     * @param Stopwatch       $stopwatch Symfony profiler Stopwatch service
      */
-    public function __construct($apiKey, GuzzleClient $client, Stopwatch $stopwatch = null)
+    public function __construct($apiKey, ClientInterface $client, Stopwatch $stopwatch = null)
     {
-        $this->apiKey = $apiKey;
-        $this->client = $client;
-
+        $this->apiKey    = $apiKey;
+        $this->client    = $client;
         $this->stopwatch = $stopwatch;
     }
 
     /**
      * Returns Guzzle HTTP client instance.
      *
-     * @return GuzzleClient
+     * @return ClientInterface
      */
     public function getClient()
     {
diff --git a/Translate/Method/Translator.php b/Translate/Method/Translator.php
index dc6f62d..66a8e6e 100644
--- a/Translate/Method/Translator.php
+++ b/Translate/Method/Translator.php
@@ -12,7 +12,7 @@
 
 use Eko\GoogleTranslateBundle\Translate\Method;
 use Eko\GoogleTranslateBundle\Translate\MethodInterface;
-use GuzzleHttp\Client as GuzzleClient;
+use GuzzleHttp\ClientInterface;
 use Symfony\Component\Stopwatch\Stopwatch;
 
 /**
@@ -50,12 +50,12 @@ class Translator extends Method implements MethodInterface
     /**
      * Constructor.
      *
-     * @param string       $apiKey    Google Translate API key
-     * @param GuzzleClient $client
-     * @param Detector     $detector  A Detector service
-     * @param Stopwatch    $stopwatch Symfony profiler stopwatch service
+     * @param string          $apiKey    Google Translate API key
+     * @param ClientInterface $client
+     * @param Detector        $detector  A Detector service
+     * @param Stopwatch       $stopwatch Symfony profiler stopwatch service
      */
-    public function __construct($apiKey, GuzzleClient $client, Detector $detector, Stopwatch $stopwatch = null)
+    public function __construct($apiKey, ClientInterface $client, Detector $detector, Stopwatch $stopwatch = null)
     {
         $this->detector = $detector;