diff --git a/tests/unit/app/CustomizeFormatterTest.php b/tests/unit/app/CustomizeFormatterTest.php
new file mode 100644
index 000000000..8a742e750
--- /dev/null
+++ b/tests/unit/app/CustomizeFormatterTest.php
@@ -0,0 +1,72 @@
+<?php
+
+namespace Tests\unit\app;
+
+use Illuminate\Filesystem\Filesystem;
+use Illuminate\Support\Facades\File;
+use Illuminate\Support\Facades\Log;
+use Tests\TestCase;
+
+class CustomizeFormatterTest extends TestCase
+{
+    private static $directory;
+
+    /**
+     * This is executed for each test.
+     */
+    protected function setUp()
+    {
+        self::$directory = PATH_TRUNK . '/storage/logs/';
+    }
+
+    /**
+     * This is done before the first test.
+     */
+    public static function setUpBeforeClass()
+    {
+        $file = new Filesystem();
+        $file->cleanDirectory(self::$directory);
+    }
+
+    /**
+     * This is done after the last test.
+     */
+    public static function tearDownAfterClass()
+    {
+        $file = new Filesystem();
+        $file->cleanDirectory(self::$directory);
+    }
+
+    /**
+     * Return all of the log levels defined in the RFC 5424 specification.
+     * @return array
+     */
+    public function levelProviders()
+    {
+        return [
+            ['emergency', 'production.EMERGENCY'],
+            ['alert', 'production.ALERT'],
+            ['critical', 'production.CRITICAL'],
+            ['error', 'production.ERROR'],
+            ['warning', 'production.WARNING'],
+            ['notice', 'production.NOTICE'],
+            ['info', 'production.INFO'],
+            ['debug', 'production.DEBUG'],
+        ];
+    }
+
+    /**
+     * This check the creation of a record with the emergency level.
+     * @test
+     * @dataProvider levelProviders
+     */
+    public function it_should_create_log_file_levels($level, $message)
+    {
+        Log::{$level}($level);
+        $files = File::allFiles(self::$directory);
+        $this->assertCount(1, $files);
+
+        $string = File::get($files[0]);
+        $this->assertRegExp("/{$message}/", $string);
+    }
+}