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diff --git a/http/codebird-php/test/environment_test.php b/http/codebird-php/test/environment_test.php
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+++ b/http/codebird-php/test/environment_test.php
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+<?php
+
+namespace Codebird;
+
+/**
+ * A Twitter library in PHP.
+ *
+ * @package   codebird-test
+ * @author    Jublo Solutions <support@jublo.net>
+ * @copyright 2010-2016 Jublo Solutions <support@jublo.net>
+ * @license   https://opensource.org/licenses/GPL-3.0 GNU General Public License 3.0
+ * @link      https://github.com/jublonet/codebird-php
+ */
+
+/**
+ * Environment tests
+ *
+ * @package codebird-test
+ */
+class Environment_Test extends \PHPUnit_Framework_TestCase
+{
+  /**
+   * Tests PHP version
+   */
+  public function testPhpVersion()
+  {
+    $this->assertTrue(
+      version_compare('5.5', phpversion(), '<='),
+      'Codebird requires PHP 5.5 or above'
+    );
+  }
+
+  /**
+   * Tests OpenSSL module availability
+   */
+  public function testOpenssl()
+  {
+    $this->assertTrue(function_exists('openssl_open'));
+  }
+}