add method to authenticate

src/behat/CentreonAPIContext.php

@@ -336,6 +336,21 @@ class CentreonAPIContext extends CentreonContext
         $this->setResponse($response);
     }
 
+    /**
+     * @When I make an authentication request with credentials ":alias" / ":password"
+     */
+    public function makeAnAuthenticationRequest($alias, $password)
+    {
+        $client = $this->getClient();
+        $response = $client->post($this->getMinkParameter('api_base') . '/api/index.php?action=authenticate', [
+            'form_params' => [
+                'username' => $alias,
+                'password' => $password
+            ]
+        ]);
+        $this->setResponse($response);
+    }
+
     /**
      * @When /^I make a MULTIPART request to "([^"]*)"$/
      * @throws \Exception