From bc9720cb51ab49f7455288074b7d83adf4ac7ff9 Mon Sep 17 00:00:00 2001
From: slavielle <sylvain.lavielle@netelios.fr>
Date: Fri, 8 Dec 2017 22:37:39 +0100
Subject: [PATCH] Fix issue #20 : add getAvailableCurrencies method for
 ProviderInterface

---
 src/Provider/FixerApi.php                     |  9 +++++++
 src/Provider/ProviderInterface.php            |  8 ++++++
 .../Provider/FixerApiTest.php                 | 25 ++++++++++++++++++-
 3 files changed, 41 insertions(+), 1 deletion(-)

diff --git a/src/Provider/FixerApi.php b/src/Provider/FixerApi.php
index ef3b8a3..2faa2b2 100644
--- a/src/Provider/FixerApi.php
+++ b/src/Provider/FixerApi.php
@@ -50,4 +50,13 @@ public function getRate($fromCurrency, $toCurrency)
 
         return $result['rates'][$toCurrency];
     }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getSupportedCurrencies()
+    {
+        $result = json_decode($this->httpClient->get(self::FIXER_API_BASEPATH)->getBody(), true);
+        return array_keys($result['rates']);
+    }
 }
diff --git a/src/Provider/ProviderInterface.php b/src/Provider/ProviderInterface.php
index 55a1478..de0b3d1 100644
--- a/src/Provider/ProviderInterface.php
+++ b/src/Provider/ProviderInterface.php
@@ -1,4 +1,5 @@
 <?php
+
 namespace CurrencyConverter\Provider;
 
 interface ProviderInterface
@@ -11,4 +12,11 @@ interface ProviderInterface
      * @return float
      */
     public function getRate($fromCurrency, $toCurrency);
+
+    /**
+     * Gets a list of supported currency codes
+     *
+     * @return array
+     */
+    public function getSupportedCurrencies();
 }
diff --git a/tests/CurrencyConverterTest/Provider/FixerApiTest.php b/tests/CurrencyConverterTest/Provider/FixerApiTest.php
index 56939c2..1d89fff 100644
--- a/tests/CurrencyConverterTest/Provider/FixerApiTest.php
+++ b/tests/CurrencyConverterTest/Provider/FixerApiTest.php
@@ -55,5 +55,28 @@ public function testGetUnavailableRate()
         $this->setExpectedException(UnsupportedCurrencyException::class);
         (new FixerApi($httpClient))->getRate('EUR', 'XXX');
     }
-    
+
+    public function testGetSupportedCurrencies()
+    {
+        $response = $this->getMock(ResponseInterface::class);
+        $response
+            ->expects($this->any())
+            ->method('getBody')
+            ->will($this->returnValue(
+                new Stream(fopen('data://text/plain,{"base":"EUR","date":"2017-12-08","rates":{"AUD":1.562,"BGN":1.9558,"BRL":3.8435,"CAD":1.5072,"CHF":1.1704,"CNY":7.7729,"CZK":25.555,"DKK":7.4417,"GBP":0.87525,"HKD":9.1661,"HRK":7.5493,"HUF":314.5,"IDR":15910.0,"ILS":4.1343,"INR":75.678,"JPY":133.26,"KRW":1285.3,"MXN":22.22,"MYR":4.8001,"NOK":9.7665,"NZD":1.7157,"PHP":59.336,"PLN":4.202,"RON":4.6336,"RUB":69.651,"SEK":9.977,"SGD":1.5889,"THB":38.361,"TRY":4.5165,"USD":1.1742,"ZAR":16.039}}', 'r'))
+            ));
+        $httpClient = $this->getMock(Client::class);
+        $httpClient
+            ->expects($this->once())
+            ->method('__call')
+            ->with(
+                'get',
+                [FixerApi::FIXER_API_BASEPATH]
+            )
+            ->will($this->returnValue($response));
+        $this->assertEquals(
+            ['AUD', 'BGN', 'BRL', 'CAD', 'CHF', 'CNY', 'CZK', 'DKK', 'GBP', 'HKD', 'HRK', 'HUF', 'IDR', 'ILS', 'INR', 'JPY', 'KRW', 'MXN', 'MYR', 'NOK', 'NZD', 'PHP', 'PLN', 'RON', 'RUB', 'SEK', 'SGD', 'THB', 'TRY', 'USD', 'ZAR'],
+            (new FixerApi($httpClient))->getSupportedCurrencies('EUR', 'USD')
+        );
+    }
 }