Added an console command to convert the old BBCode comments to markdown

tests/Helpers/BBCodeToMarkdownConverterTest.php

@@ -0,0 +1,70 @@
+<?php
+/**
+ *
+ * part-db version 0.1
+ * Copyright (C) 2005 Christoph Lechner
+ * http://www.cl-projects.de/
+ *
+ * part-db version 0.2+
+ * Copyright (C) 2009 K. Jacobs and others (see authors.php)
+ * http://code.google.com/p/part-db/
+ *
+ * Part-DB Version 0.4+
+ * Copyright (C) 2016 - 2019 Jan Böhmer
+ * https://github.com/jbtronics
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+ *
+ */
+
+namespace App\Tests\Helpers;
+
+
+use App\Helpers\BBCodeToMarkdownConverter;
+use PHPUnit\Framework\TestCase;
+
+class BBCodeToMarkdownConverterTest extends TestCase
+{
+    protected $converter;
+
+    public function setUp()
+    {
+        $this->converter = new BBCodeToMarkdownConverter();
+    }
+
+    public function dataProvider()
+    {
+        return [
+            ['[b]Bold[/b]', '**Bold**'],
+            ['[i]Italic[/i]', '*Italic*'],
+            ['[s]Strike[/s]', '<s>Strike</s>'],
+            ['[url]https://foo.bar[/url]', '<https://foo.bar>'],
+            ['[url=https://foo.bar]test[/url]', '[test](https://foo.bar)'],
+            ['[center]Centered[/center]', '<div style="text-align:center">Centered</div>'],
+            ['test no change', 'test no change'],
+            ['**Test**', '**Test**'],
+        ];
+    }
+
+    /**
+     * @dataProvider dataProvider
+     * @param $bbcode
+     * @param $expected
+     */
+    public function testConvert($bbcode, $expected)
+    {
+        $this->assertEquals($expected, $this->converter->convert($bbcode));
+    }
+}