diff --git a/tests/Propel/Tests/Generator/Util/IconvTransliterationTest.php b/tests/Propel/Tests/Generator/Util/IconvTransliterationTest.php
new file mode 100644
index 0000000000..c7e1b30654
--- /dev/null
+++ b/tests/Propel/Tests/Generator/Util/IconvTransliterationTest.php
@@ -0,0 +1,85 @@
+<?php
+
+/**
+ * This file is part of the Propel package.
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ *
+ * @license MIT License
+ */
+
+use Propel\Generator\Util\PhpParser;
+use \Propel\Tests\TestCase;
+
+/**
+ *
+ */
+class IconvTransliterationTest extends TestCase
+{
+    /**
+     * Ensure iconv is available and locale supports transliteration.
+     */
+    protected function setUp(): void
+    {
+        if (!function_exists('iconv')) {
+            $this->markTestSkipped('iconv() is not available.');
+        }
+
+        $currentLocale = setlocale(LC_CTYPE, 0);
+        if (in_array($currentLocale, ['C', 'POSIX'], true)) {
+            // Attempt to change the locale to something compatible
+            $fallbackLocales = ['en_US.UTF-8', 'C.UTF-8', 'de_DE.UTF-8'];
+            foreach ($fallbackLocales as $locale) {
+                if (setlocale(LC_CTYPE, $locale) !== false) {
+                    return;
+                }
+            }
+
+            // Still stuck in C/POSIX? Skip
+            $this->markTestSkipped("Unsupported locale for iconv transliteration: $currentLocale");
+        }
+    }
+
+    /**
+     * Excerpt from http://php.net/manual/en/function.iconv.php#74101
+     * "Please note that iconv('UTF-8', 'ASCII//TRANSLIT', ...) doesn't work properly when locale category LC_CTYPE is set to C or POSIX. You must choose another locale otherwise all non-ASCII characters will be replaced with question marks."
+     */
+    public function testIconvSupportedLocale()
+    {
+        if (!function_exists('iconv')) {
+            $this->markTestSkipped();
+        }
+        $LC_CTYPE = setlocale(LC_CTYPE, 0);
+        $this->assertNotEquals('C', $LC_CTYPE, 'iconv transliteration does not work properly when locale category LC_CTYPE is set to C or POSIX');
+        $this->assertNotEquals('POSIX', $LC_CTYPE, 'iconv transliteration does not work properly when locale category LC_CTYPE is set to C or POSIX');
+    }
+
+    public static function iconvTransliterationSlugProvider()
+    {
+        return [
+            ['foo', 'foo'],
+            ['fôo', 'foo'],
+            ['€', 'EUR'],
+            ['CŠŒŽšœžŸµÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÑÒÓÔÕÖÙÚÛÜÝßàáâãäåæçèéêëìíîïñòóôõöùúûüýÿ', 'CSOEZsoezYuAAAAAAAECEEEEIIIINOOOOOUUUUYssaaaaaaaeceeeeiiiinooooouuuuyy'],
+            ['ø', 'o'],
+            ['Ø', 'O'],
+            ['¥Ðð', 'JPYDd'],
+        ];
+    }
+
+    /**
+     * @dataProvider iconvTransliterationSlugProvider
+     */
+    public function testIconvTransliteration(string $input, string $expected): void
+    {
+        $translit = iconv('utf-8', 'us-ascii//TRANSLIT', $input);
+
+        // If transliteration results in all question marks, skip (locale likely broken)
+        if (preg_match('/^\?+$/', $translit) && $input !== str_repeat('?', strlen($input))) {
+            $this->markTestSkipped('iconv() returned only question marks — possibly due to locale issues.');
+        }
+
+        $this->assertEquals($expected, $translit, 'iconv transliteration behaves as expected');
+    }
+
+}