Refactored ErrorLogHandler to use constantes for types

- Create tests for ErrorLogHandler;
- Remove types 1, 2 and 3 in favor of specific handlers.

tests/Monolog/Handler/ErrorLogHandlerTest.php

@@ -0,0 +1,43 @@
+<?php
+
+namespace Monolog\Handler;
+
+use Monolog\TestCase;
+use Monolog\Logger;
+
+function error_log()
+{
+    $GLOBALS['error_log'] = func_get_args();
+}
+
+class ErrorLogHandlerTest extends TestCase
+{
+
+    protected function setUp()
+    {
+        $GLOBALS['error_log'] = array();
+    }
+
+    /**
+     * @covers Monolog\Handler\ErrorLogHandler::__construct
+     * @expectedException InvalidArgumentException
+     * @expectedExceptionMessage The given message type "42" is not supported
+     */
+    public function testShouldNotAcceptAnInvalidTypeOnContructor()
+    {
+        new ErrorLogHandler(42);
+    }
+
+    /**
+     * @covers Monolog\Handler\ErrorLogHandler::write
+     */
+    public function testShouldLogMessagesUsingErrorLogFuncion()
+    {
+        $type = ErrorLogHandler::OPERATING_SYSTEM;
+        $handler = new ErrorLogHandler($type);
+        $handler->handle($this->getRecord(Logger::ERROR));
+
+        $this->assertStringMatchesFormat('[%s] test.ERROR: test [] []', $GLOBALS['error_log'][0]);
+        $this->assertSame($GLOBALS['error_log'][1], $type);
+    }
+}