Added tests, fixed a bunch of bugs

tests/Monolog/Formatter/SimpleFormatterTest.php

@@ -0,0 +1,35 @@
+<?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\Formatter;
+
+use Monolog\Logger;
+
+class SimpleFormatterTest extends \PHPUnit_Framework_TestCase
+{
+    public function testDefFormatWithString()
+    {
+        $formatter = new SimpleFormatter(null, 'Y-m-d');
+        $message = $formatter->format('log', Logger::WARN, 'foo');
+        $this->assertEquals('['.date('Y-m-d').'] log.WARN: foo'."\n", $message);
+    }
+
+    public function testDefFormatWithArray()
+    {
+        $formatter = new SimpleFormatter(null, 'Y-m-d');
+        $message = $formatter->format('xx', Logger::FATAL, array(
+            'log' => 'log',
+            'level' => 'WARN',
+            'message' => 'foo'
+        ));
+        $this->assertEquals('['.date('Y-m-d').'] log.WARN: foo'."\n", $message);
+    }
+}