add function to get countries by continent

The class Util::Country info return countries code by continent

Tests/Util/CountriesInfoTest.php

@@ -0,0 +1,48 @@
+<?php
+
+namespace Chill\MainBundle\Tests\Util;
+
+use PHPUnit\Framework\TestCase;
+use Chill\MainBundle\Util\CountriesInfo;
+
+/**
+ * tests for CountriesInfos
+ *
+ * @author julien.fastre@champs-libre.coop
+ */
+class CountriesInfoTest extends TestCase {
+    
+    public function testGetCountryData() 
+    {
+        $raw = CountriesInfo::getCountriesData();
+        
+        $this->assertStringStartsWith("AS AF AFG 004 Afghanistan, Islamic Republic of",
+                $raw);
+    }
+    
+    public function testGetArrayCountriesData() 
+    {
+        $data = CountriesInfo::getArrayCountriesData();
+        
+        $this->assertNotNull($data);
+        $this->assertContains(array(
+            "AS", "AF", "AFG", "004", "Afghanistan, Islamic Republic of"
+        ), $data);
+    }
+    
+    public function testGetCountryCodeByContinents()
+    {
+        $countries = CountriesInfo::getCountriesCodeByContinent('EU');
+        
+        $this->assertContains('BE', $countries);
+        $this->assertContains('FR', $countries);
+        $this->assertContains('GB', $countries);
+    }
+    
+    public function getGetContinentsCodes()
+    {
+        $continents = CountriesInfo::getContinentsCodes();
+        
+        $this->assertContains('EU', $continents);
+    }
+}