Moved extension to fa-icon logic to a service.

That way we can use it from inside PHP code and the logic is more testable.

tests/Services/FAIconGeneratorTest.php

@@ -0,0 +1,72 @@
+<?php
+/**
+ * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
+ *
+ * Copyright (C) 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\Services;
+
+
+use App\Services\FAIconGenerator;
+use Symfony\Bundle\FrameworkBundle\Test\WebTestCase;
+
+class FAIconGeneratorTest extends WebTestCase
+{
+    /**
+     * @var AmountFormatter
+     */
+    protected $service;
+
+    public function setUp()
+    {
+        parent::setUp(); // TODO: Change the autogenerated stub
+
+        //Get an service instance.
+        self::bootKernel();
+        $this->service = self::$container->get(FAIconGenerator::class);
+    }
+
+    public function fileExtensionDataProvider() : array
+    {
+        return [
+            ['pdf', 'fa-file-pdf'],
+            ['jpeg', 'fa-file-image'],
+            ['txt', 'fa-file-alt'],
+            ['doc', 'fa-file-word'],
+            ['zip', 'fa-file-archive'],
+            ['php', 'fa-file-code'],
+            ['tmp', 'fa-file'],
+            ['fgd', 'fa-file'],
+        ];
+    }
+
+    /**
+     * @dataProvider fileExtensionDataProvider
+     */
+    public function testFileExtensionToFAType(string $ext, string $expected)
+    {
+        $this->assertEquals($expected, $this->service->fileExtensionToFAType($ext));
+    }
+
+    public function testGenerateIconHTML()
+    {
+        $this->assertEquals('<i class="fas fa-file "></i>', $this->service->generateIconHTML('fa-file'));
+        $this->assertEquals('<i class="far fa-file "></i>', $this->service->generateIconHTML('fa-file', 'far'));
+        $this->assertEquals('<i class="far fa-file fa-2x"></i>', $this->service->generateIconHTML('fa-file', 'far', 'fa-2x'));
+    }
+}