[Core] Adding extra unit tests

src/module-elasticsuite-core/Test/Unit/Helper/MappingTest.php

@@ -0,0 +1,41 @@
+<?php
+/**
+ * DISCLAIMER
+ *
+ * Do not edit or add to this file if you wish to upgrade Smile ElasticSuite to newer versions in the future.
+ *
+ * @category  Smile
+ * @package   Smile\ElasticsuiteCatalog
+ * @author    Richard BAYET <richard.bayet@smile.fr>
+ * @copyright 2026 Smile
+ * @license   Open Software License ("OSL") v. 3.0
+ */
+
+namespace Smile\ElasticsuiteCore\Test\Unit\Helper;
+
+use PHPUnit\Framework\TestCase;
+
+/**
+ * Mapping helper test case.
+ *
+ * @category Smile
+ * @package  Smile\ElasticsuiteCore
+ * @author   Richard BAYET <richard.bayet@smile.fr>
+ */
+class MappingTest extends TestCase
+{
+    /**
+     * Tests that getOptionTextFieldName returns a string with the 'option_text_' prefix prepended to the field name.
+     *
+     * @return void
+     */
+    public function testGetOptionTextFieldNameReturnsStringWithPrefixPrependedToFieldName()
+    {
+        $mockContext = $this->createMock(\Magento\Framework\App\Helper\Context::class);
+        $mapping = new \Smile\ElasticsuiteCore\Helper\Mapping($mockContext);
+        $fieldName = 'test_field';
+        $result = $mapping->getOptionTextFieldName($fieldName);
+
+        $this->assertEquals('option_text_test_field', $result);
+    }
+}