adding unit test for message interpolation

tests/lib/logger.php

@@ -0,0 +1,40 @@
+<?php
+/**
+ * Copyright (c) 2014 Thomas Müller <thomas.mueller@tmit.eu>
+ * This file is licensed under the Affero General Public License version 3 or
+ * later.
+ * See the COPYING-README file.
+ */
+
+namespace Test;
+
+use OC\Log;
+
+class Logger extends \PHPUnit_Framework_TestCase {
+	/**
+	 * @var \OCP\ILogger
+	 */
+	private $logger;
+	static private $logs = array();
+
+	public function setUp() {
+		self::$logs = array();
+		$this->logger = new Log($this);
+	}
+
+	public function testInterpolation() {
+		$logger = $this->logger;
+		$logger->info('{Message {nothing} {user} {foo.bar} a}', array('user' => 'Bob', 'foo.bar' => 'Bar'));
+
+		$expected = array('1 {Message {nothing} Bob Bar a}');
+		$this->assertEquals($expected, $this->getLogs());
+	}
+
+	private function getLogs() {
+		return self::$logs;
+	}
+
+	public static function write($app, $message, $level) {
+		self::$logs[]= "$level $message";
+	}
+}