add test which uses #[RunTestsInSeparateProcesses]

Author: nikophil

tests/end-to-end/repeat/_files/RepeatInIsolationTest.php

@@ -0,0 +1,26 @@
+<?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.
+ */
+
+use PHPUnit\Framework\Attributes\RunTestsInSeparateProcesses;
+use PHPUnit\Framework\TestCase;
+
+#[RunTestsInSeparateProcesses]
+final class RepeatInIsolationTest extends TestCase
+{
+    public function test1(): void
+    {
+        $this->assertTrue(true);
+    }
+
+    public function test2(): void
+    {
+        $this->assertTrue(true);
+    }
+}

tests/end-to-end/repeat/isolation.phpt

@@ -0,0 +1,23 @@
+--TEST--
+Repeat option
+--FILE--
+<?php declare(strict_types=1);
+$_SERVER['argv'][] = '--do-not-cache-result';
+$_SERVER['argv'][] = '--no-configuration';
+$_SERVER['argv'][] = '--repeat';
+$_SERVER['argv'][] = '2';
+$_SERVER['argv'][] = __DIR__ . '/_files/RepeatInIsolationTest.php';
+
+require __DIR__ . '/../../bootstrap.php';
+
+(new PHPUnit\TextUI\Application)->run($_SERVER['argv']);
+--EXPECTF--
+PHPUnit %s by Sebastian Bergmann and contributors.
+
+Runtime:       %s
+
+....                                                                4 / 4 (100%)
+
+Time: %s, Memory: %s MB
+
+OK (4 tests, 4 assertions)