Test for exceptions when creating config

tests/ConfigTest.php

@@ -42,6 +42,17 @@ class ConfigTest extends \PHPUnit_Framework_TestCase
         $this->assertInternalType('string', $this->config->rtmpdump);
     }
 
+    /**
+     * Test the getInstance function with a missing config file.
+     *
+     * @return void
+     * @expectedException Exception
+     */
+    public function testGetInstanceWithMissingFile()
+    {
+        Config::getInstance('foo');
+    }
+
     /**
      * Test the getInstance function with the CONVERT environment variable.
      *