Adding test covearge for error conditions

tests/phpunit/SamBurns/ConfigFileParser/Test/UnparsableFilesTest.php

@@ -0,0 +1,17 @@
+<?php
+namespace SamBurns\ConfigFileParser\Test;
+
+use SamBurns\ConfigFileParser\ConfigFileParser;
+use PHPUnit_Framework_TestCase as TestCase;
+
+class UnparsableFilesTest extends TestCase
+{
+    /**
+     * @expectedException \SamBurns\ConfigFileParser\Exception\FileFormatNotParsable
+     */
+    public function testGetExceptionForUnreadableFiles()
+    {
+        $configFileParser = new ConfigFileParser();
+        $configFileParser->parseConfigFile('file.bad-extension');
+    }
+}