Add test for providing named arguments in DataProvider

tests/_files/DataProviderNamedArgumentsTest.php

@@ -0,0 +1,30 @@
+<?php declare(strict_types=1);
+/*
+ * This file is part of PHPUnit.
+ *
+ * (c) Sebastian Bergmann <sebastian@phpunit.de>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace PHPUnit\TestFixture;
+
+use PHPUnit\Framework\Attributes\DataProvider;
+use PHPUnit\Framework\TestCase;
+
+class DataProviderNamedArgumentsTest extends TestCase
+{
+    public static function providerMethod()
+    {
+        return [
+            ['a' => 1, 'b' => 2, 'c' => 3],
+            ['c' => 3, 'a' => 2, 'b' => 1],
+        ];
+    }
+
+    #[DataProvider('providerMethod')]
+    public function testAdd($a, $b, $c): void
+    {
+        $this->assertEquals($c, $a + $b);
+    }
+}

tests/end-to-end/generic/dataprovider-named-arguments.phpt

@@ -0,0 +1,20 @@
+--TEST--
+phpunit ../../_files/DataProviderNamedArgumentsTest.php
+--FILE--
+<?php declare(strict_types=1);
+$_SERVER['argv'][] = '--do-not-cache-result';
+$_SERVER['argv'][] = '--no-configuration';
+$_SERVER['argv'][] = __DIR__ . '/../../_files/DataProviderNamedArgumentsTest.php';
+
+require_once __DIR__ . '/../../bootstrap.php';
+(new PHPUnit\TextUI\Application)->run($_SERVER['argv']);
+--EXPECTF--
+PHPUnit %s by Sebastian Bergmann and contributors.
+
+Runtime: %s
+
+..                                                                  2 / 2 (100%)
+
+Time: %s, Memory: %s
+
+OK (2 tests, 2 assertions)