unit test for RedisHandler and README.md update

* updated README.md to inform users of RedisHandler
* added unit test for RedisHandler

README.mdown

@@ -126,6 +126,7 @@ Handlers
 - _DoctrineCouchDBHandler_: Logs records to a CouchDB server via the Doctrine CouchDB ODM.
 - _RavenHandler_: Logs records to a [Sentry](http://getsentry.com/) server using
   [raven](https://packagist.org/packages/raven/raven).
+- _RedisHandlen_: Logs records to a [redis](http://redis.io) server.
 
 Wrappers / Special Handlers
 ---------------------------

tests/Monolog/Handler/RedisHandlerTest.php

@@ -0,0 +1,71 @@
+<?php
+
+/*
+ * This file is part of the Monolog package.
+ *
+ * (c) Jordi Boggiano <j.boggiano@seld.be>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Monolog\Handler;
+
+use Monolog\TestCase;
+use Monolog\Logger;
+use Monolog\Formatter\LineFormatter;
+
+class RedisHandlerTest extends TestCase
+{
+    /**
+     * @expectedException InvalidArgumentException
+     */
+    public function testConstructorShouldThrowExceptionForInvalidRedis()
+    {
+        new RedisHandler(new \stdClass(), 'key');
+    }
+
+    public function testConstructorShouldWorkWithPredis()
+    {
+        $redis = $this->getMock('Predis\Client');
+        $this->assertInstanceof('Monolog\Handler\RedisHandler', new RedisHandler($redis, 'key'));
+    }
+
+    public function testConstructorShouldWorkWithRedis()
+    {
+        $redis = $this->getMock('Redis');
+        $this->assertInstanceof('Monolog\Handler\RedisHandler', new RedisHandler($redis, 'key'));
+    }
+
+    public function testPredisHandle()
+    {
+        $redis = $this->getMock('Predis\Client', array('rpush'));
+
+        // Predis\Client uses rpush
+        $redis->expects($this->once())
+            ->method('rpush')
+            ->with('key', 'test');
+
+        $record = $this->getRecord(Logger::WARNING, 'test', array('data' => new \stdClass, 'foo' => 34));
+
+        $handler = new RedisHandler($redis, 'key');
+        $handler->setFormatter(new LineFormatter("%message%"));
+        $handler->handle($record);
+    }
+
+    public function testRedisHandle()
+    {
+        $redis = $this->getMock('Redis', array('rpush'));
+
+        // Redis uses rPush
+        $redis->expects($this->once())
+            ->method('rPush')
+            ->with('key', 'test');
+
+        $record = $this->getRecord(Logger::WARNING, 'test', array('data' => new \stdClass, 'foo' => 34));
+
+        $handler = new RedisHandler($redis, 'key');
+        $handler->setFormatter(new LineFormatter("%message%"));
+        $handler->handle($record);
+    }
+}