diff --git a/lib/Github/HttpClient/HttpClientInterface.php b/lib/Github/HttpClient/HttpClientInterface.php
index 7c327d625e3..f84472ee7d6 100644
--- a/lib/Github/HttpClient/HttpClientInterface.php
+++ b/lib/Github/HttpClient/HttpClientInterface.php
@@ -95,4 +95,15 @@ public function setOption($name, $value);
      * @param array $headers
      */
     public function setHeaders(array $headers);
+    
+    /**
+     * Authenticate a user for all next requests
+     *
+     * @param string $tokenOrLogin GitHub private token/username/client ID
+     * @param null|string $password GitHub password/secret (optionally can contain $authMethod)
+     * @param null|string $authMethod One of the AUTH_* class constants
+     *
+     * @throws InvalidArgumentException If no authentication method was given
+     */
+    public function authenticate($tokenOrLogin, $password, $authMethod);
 }
diff --git a/test/Github/Tests/ClientTest.php b/test/Github/Tests/ClientTest.php
index 0469b887697..d425f8d60fd 100644
--- a/test/Github/Tests/ClientTest.php
+++ b/test/Github/Tests/ClientTest.php
@@ -33,7 +33,7 @@ public function shouldPassHttpClientInterfaceToConstructor()
      */
     public function shouldAuthenticateUsingAllGivenParameters($login, $password, $method)
     {
-        $httpClient = $this->getHttpClientMock(array('authenticate'));
+        $httpClient = $this->getHttpClientMock();
         $httpClient->expects($this->once())
             ->method('authenticate')
             ->with($login, $password, $method);
@@ -58,7 +58,7 @@ public function getAuthenticationFullData()
      */
     public function shouldAuthenticateUsingGivenParameters($token, $method)
     {
-        $httpClient = $this->getHttpClientMock(array('authenticate'));
+        $httpClient = $this->getHttpClientMock();
         $httpClient->expects($this->once())
             ->method('authenticate')
             ->with($token, null, $method);
@@ -171,7 +171,7 @@ public function getApiClassesProvider()
     public function getHttpClientMock(array $methods = array())
     {
         $methods = array_merge(
-            array('get', 'post', 'patch', 'put', 'delete', 'request', 'setOption', 'setHeaders'),
+            array('get', 'post', 'patch', 'put', 'delete', 'request', 'setOption', 'setHeaders', 'authenticate'),
             $methods
         );
 
diff --git a/test/Github/Tests/Mock/TestHttpClient.php b/test/Github/Tests/Mock/TestHttpClient.php
index 0423d8ab11d..7bef80defb7 100644
--- a/test/Github/Tests/Mock/TestHttpClient.php
+++ b/test/Github/Tests/Mock/TestHttpClient.php
@@ -18,7 +18,7 @@ class TestHttpClient implements HttpClientInterface
     public $options = array();
     public $headers = array();
 
-    public function authenticate()
+    public function authenticate($tokenOrLogin, $password, $authMethod)
     {
         $this->authenticated = true;
     }