Add test for restoration of current working directory

Author: sebastianbergmann

tests/_files/CwdRestoreTest.php

@@ -0,0 +1,22 @@
+<?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\TestCase;
+
+final class CwdRestoreTest extends TestCase
+{
+    public function testChangesCwd(): void
+    {
+        chdir(sys_get_temp_dir());
+
+        $this->assertTrue(true);
+    }
+}

tests/end-to-end/generic/cwd-restore-after-test.phpt

@@ -0,0 +1,18 @@
+--TEST--
+phpunit ../../_files/CwdRestoreTest.php
+--FILE--
+<?php declare(strict_types=1);
+$cwd = getcwd();
+
+$_SERVER['argv'][] = '--do-not-cache-result';
+$_SERVER['argv'][] = '--no-configuration';
+$_SERVER['argv'][] = '--no-output';
+$_SERVER['argv'][] = __DIR__ . '/../../_files/CwdRestoreTest.php';
+
+require_once __DIR__ . '/../../bootstrap.php';
+
+(new PHPUnit\TextUI\Application)->run($_SERVER['argv']);
+
+var_dump($cwd === getcwd());
+--EXPECTF--
+bool(true)