use pre-defined icons in menu as well (#913)

tests/Twig/IconExtensionTest.php

@@ -0,0 +1,58 @@
+<?php
+
+/*
+ * This file is part of the Kimai time-tracking app.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\Tests\Twig;
+
+use App\Twig\IconExtension;
+use PHPUnit\Framework\TestCase;
+use Twig\TwigFilter;
+
+/**
+ * @covers \App\Twig\IconExtension
+ */
+class IconExtensionTest extends TestCase
+{
+    public function testGetFilters()
+    {
+        $filters = ['icon'];
+        $sut = new IconExtension();
+        $twigFilters = $sut->getFilters();
+        $this->assertCount(count($filters), $twigFilters);
+        $i = 0;
+        /** @var TwigFilter $filter */
+        foreach ($twigFilters as $filter) {
+            $this->assertInstanceOf(TwigFilter::class, $filter);
+            $this->assertEquals($filters[$i++], $filter->getName());
+        }
+    }
+
+    public function testIcon()
+    {
+        $icons = [
+            'user', 'customer', 'project', 'activity', 'admin', 'invoice', 'timesheet', 'dashboard', 'logout', 'trash',
+            'delete', 'repeat', 'edit', 'manual', 'help', 'start', 'start-small', 'stop', 'stop-small', 'filter',
+            'create', 'list', 'print', 'visibility', 'calendar', 'money', 'duration', 'download', 'copy', 'settings',
+            'export', 'pdf', 'csv', 'ods', 'xlsx', 'on', 'off', 'audit', 'home', 'shop', 'about', 'debug', 'profile-stats',
+            'profile', 'warning', 'permissions', 'back', 'tag', 'avatar', 'timesheet-team', 'plugin', 'configuration'
+        ];
+
+        // test pre-defined icons
+        $sut = new IconExtension();
+
+        foreach ($icons as $icon) {
+            $result = $sut->icon($icon);
+            $this->assertNotEmpty($result, 'Missing icon definition: ' . $icon);
+            $this->assertIsString($result);
+        }
+
+        // test fallback will be returned
+        $this->assertEquals('', $sut->icon('foo'));
+        $this->assertEquals('bar', $sut->icon('foo', 'bar'));
+    }
+}