feat(Context): add interface for CurrencyFormatter

Author: Jens Schulze

src/Core/Helper/CurrencyFormatter.php

@@ -23,7 +23,7 @@
  * $str = $this->format($centAmount, $currency); // '1.234,56 €'
  * @package Commercetools\Core\Helper
  */
-class CurrencyFormatter
+class CurrencyFormatter implements CurrencyFormatterInterface
 {
     protected $context;
 

src/Core/Helper/CurrencyFormatterInterface.php

@@ -0,0 +1,16 @@
+<?php
+/**
+ * @author @jenschude <jens.schulze@commercetools.de>
+ */
+
+namespace Commercetools\Core\Helper;
+
+interface CurrencyFormatterInterface
+{
+    /**
+     * @param $centAmount
+     * @param $currency
+     * @return string
+     */
+    public function format($centAmount, $currency);
+}

src/Core/Model/Common/Context.php

@@ -5,6 +5,7 @@
 
 namespace Commercetools\Core\Model\Common;
 
+use Commercetools\Core\Helper\CurrencyFormatterInterface;
 use Pimple\Container;
 use Psr\Log\LoggerInterface;
 use Commercetools\Core\Helper\CurrencyFormatter;
@@ -72,7 +73,7 @@ class Context implements \ArrayAccess
     private $languages = [];
 
     /**
-     * @var CurrencyFormatter
+     * @var CurrencyFormatterInterface
      */
     private $currencyFormatter;
 
@@ -141,15 +142,15 @@ public function setLanguages(array $languages)
     }
 
     /**
-     * @return CurrencyFormatter
+     * @return CurrencyFormatterInterface
      */
     public function getCurrencyFormatter()
     {
         return $this->currencyFormatter;
     }
 
     /**
-     * @param CurrencyFormatter $currencyFormatter
+     * @param CurrencyFormatterInterface $currencyFormatter
      * @return Context
      */
     public function setCurrencyFormatter($currencyFormatter)