test: added some new Twig extension tests

Author: thorsten

tests/phpMyFAQ/Twig/Extensions/FormatBytesTwigExtensionTest.php

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+<?php
+
+namespace phpMyFAQ\Twig\Extensions;
+
+use PHPUnit\Framework\TestCase;
+use Twig\Environment;
+use Twig\Error\LoaderError;
+use Twig\Error\RuntimeError;
+use Twig\Error\SyntaxError;
+use Twig\Extension\AttributeExtension;
+use Twig\Loader\ArrayLoader;
+
+class FormatBytesTwigExtensionTest extends TestCase
+{
+    /**
+     * @throws SyntaxError
+     * @throws RuntimeError
+     * @throws LoaderError
+     */
+    public function testFormatBytesFilter(): void
+    {
+        $loader = new ArrayLoader([
+            'index' => '{{ 1536|formatBytes }}',
+        ]);
+        $twig = new Environment($loader);
+        $twig->addExtension(new AttributeExtension(FormatBytesTwigExtension::class));
+
+        $output = $twig->render('index');
+        $this->assertSame('1.5 KB', $output);
+    }
+}

tests/phpMyFAQ/Twig/Extensions/IsoDateTwigExtensionTest.php

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+<?php
+
+namespace phpMyFAQ\Twig\Extensions;
+
+use PHPUnit\Framework\TestCase;
+use Twig\Environment;
+use Twig\Error\LoaderError;
+use Twig\Error\RuntimeError;
+use Twig\Error\SyntaxError;
+use Twig\Extension\AttributeExtension;
+use Twig\Loader\ArrayLoader;
+
+class IsoDateTwigExtensionTest extends TestCase
+{
+    /**
+     * @throws SyntaxError
+     * @throws RuntimeError
+     * @throws LoaderError
+     */
+    public function testCreateIsoDateFilter(): void
+    {
+        $loader = new ArrayLoader([
+            'index' => '{{ 202504011230 | createIsoDate }}',
+        ]);
+        $twig = new Environment($loader);
+        $twig->addExtension(new AttributeExtension(IsoDateTwigExtension::class));
+
+        $output = $twig->render('index');
+        $this->assertSame('2025-04-01 12:30', $output);
+    }
+}

tests/phpMyFAQ/Twig/Extensions/LanguageCodeTwigExtensionTest.php

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+<?php
+
+namespace phpMyFAQ\Twig\Extensions;
+
+use PHPUnit\Framework\TestCase;
+use Twig\Environment;
+use Twig\Error\LoaderError;
+use Twig\Error\RuntimeError;
+use Twig\Error\SyntaxError;
+use Twig\Extension\AttributeExtension;
+use Twig\Loader\ArrayLoader;
+
+class LanguageCodeTwigExtensionTest extends TestCase
+{
+    /**
+     * @throws SyntaxError
+     * @throws RuntimeError
+     * @throws LoaderError
+     */
+    public function testGetFromLanguageCodeFilter(): void
+    {
+        $loader = new ArrayLoader([
+            'index' => "{{ 'en' | getFromLanguageCode }}",
+        ]);
+        $twig = new Environment($loader);
+        $twig->addExtension(new AttributeExtension(LanguageCodeTwigExtension::class));
+
+        $output = $twig->render('index');
+        $this->assertSame('English', $output);
+    }
+}