Added additional tests

tests/Services/Formatters/MoneyFormatterTest.php

@@ -0,0 +1,97 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
+ *
+ *  Copyright (C) 2019 - 2026 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 Affero General Public License as published
+ *  by the Free Software Foundation, either version 3 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 Affero General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Affero General Public License
+ *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+namespace App\Tests\Services\Formatters;
+
+use App\Entity\PriceInformations\Currency;
+use App\Services\Formatters\MoneyFormatter;
+use Symfony\Bundle\FrameworkBundle\Test\WebTestCase;
+
+final class MoneyFormatterTest extends WebTestCase
+{
+    private static MoneyFormatter $service;
+
+    public static function setUpBeforeClass(): void
+    {
+        self::bootKernel();
+        self::$service = self::getContainer()->get(MoneyFormatter::class);
+    }
+
+    public function testFormatWithFloatInput(): void
+    {
+        $currency = new Currency();
+        $currency->setIsoCode('USD');
+        $result = self::$service->format(1.5, $currency);
+
+        $this->assertSame('$ 1.50', $result);
+    }
+
+    public function testFormatWithNullCurrencyUsesBaseCurrency(): void
+    {
+        $result = self::$service->format(1.5);
+        // Should return a non-empty formatted string
+        $this->assertNotEmpty($result);
+        $this->assertIsString($result);
+    }
+
+    public function testFormatWithExplicitCurrencyUsesThatCurrency(): void
+    {
+        $currency = new Currency();
+        $currency->setIsoCode('USD');
+
+        $result = self::$service->format(10.0, $currency);
+        $this->assertNotEmpty($result);
+        $this->assertStringContainsString('10', $result);
+    }
+
+    public function testFormatStringInputWorksSameAsFloat(): void
+    {
+        $resultFloat = self::$service->format(1.5);
+        $resultString = self::$service->format('1.5');
+        $this->assertSame($resultFloat, $resultString);
+    }
+
+    public function testShowAllDigitsRespectsFractionCount(): void
+    {
+        // With show_all_digits = true and decimals = 3, we expect exactly 3 decimal places
+        $result = self::$service->format(1.5, null, 3, true);
+        // The number should contain exactly 3 decimal digits
+        $this->assertMatchesRegularExpression('/\d{3}(?!\d)/', $result);
+    }
+
+    public function testZeroIsFormattedCorrectly(): void
+    {
+        $result = self::$service->format(0.0);
+        $this->assertNotEmpty($result);
+        $this->assertStringContainsString('0', $result);
+    }
+
+    public function testCurrencyWithEmptyIsoCodeFallsBackToBaseCurrency(): void
+    {
+        $currency = new Currency();
+        // Empty ISO code → should fall back to base currency
+        $resultWithEmpty = self::$service->format(1.0, $currency);
+        $resultWithNull = self::$service->format(1.0, null);
+        $this->assertSame($resultWithNull, $resultWithEmpty);
+    }
+}