Add test for #6391

Author: sebastianbergmann

tests/end-to-end/regression/6391.phpt

@@ -0,0 +1,35 @@
+--TEST--
+https://github.com/sebastianbergmann/phpunit/issues/6391
+--XFAIL--
+https://github.com/sebastianbergmann/phpunit/issues/6391
+--FILE--
+<?php declare(strict_types=1);
+$_SERVER['argv'][] = '--no-configuration';
+$_SERVER['argv'][] = '--do-not-cache-result';
+$_SERVER['argv'][] = '--debug';
+$_SERVER['argv'][] = '--static-backup';
+$_SERVER['argv'][] = __DIR__ . '/6391/tests/Issue6391Test.php';
+
+require_once __DIR__ . '/../../bootstrap.php';
+
+(new PHPUnit\TextUI\Application)->run($_SERVER['argv']);
+--EXPECTF--
+PHPUnit Started (PHPUnit %s using %s)
+Test Runner Configured
+Event Facade Sealed
+Test Suite Loaded (1 test)
+Test Runner Started
+Test Suite Sorted
+Test Runner Execution Started (1 test)
+Test Suite Started (TestFixture\Issue6391\Issue6391Test, 1 test)
+Before First Test Method Called (TestFixture\Issue6391\Issue6391Test::setUpBeforeClass)
+Before First Test Method Finished:
+- TestFixture\Issue6391\Issue6391Test::setUpBeforeClass
+Test Preparation Started (TestFixture\Issue6391\Issue6391Test::testOne)
+Test Prepared (TestFixture\Issue6391\Issue6391Test::testOne)
+Test Passed (TestFixture\Issue6391\Issue6391Test::testOne)
+Test Finished (TestFixture\Issue6391\Issue6391Test::testOne)
+Test Suite Finished (TestFixture\Issue6391\Issue6391Test, 1 test)
+Test Runner Execution Finished
+Test Runner Finished
+PHPUnit Finished (Shell Exit Code: 0)

tests/end-to-end/regression/6391/src/Issue6391.php

@@ -0,0 +1,22 @@
+<?php declare(strict_types=1);
+/*
+ * This file is part of PHPUnit.
+ *
+ * (c) Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace TestFixture\Issue6391;
+
+use Error;
+
+class Issue6391
+{
+    public static $instance;
+
+    public function __unserialize(array $data): void
+    {
+        throw new Error("Cannot unserialize '{$this}'");
+    }
+}

tests/end-to-end/regression/6391/tests/Issue6391Test.php

@@ -0,0 +1,27 @@
+<?php declare(strict_types=1);
+/*
+ * This file is part of PHPUnit.
+ *
+ * (c) Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace TestFixture\Issue6391;
+
+use PHPUnit\Framework\TestCase;
+
+require __DIR__ . '/../src/Issue6391.php';
+
+final class Issue6391Test extends TestCase
+{
+    public static function setUpBeforeClass(): void
+    {
+        Issue6391::$instance = new Issue6391;
+    }
+
+    public function testOne(): void
+    {
+        $this->assertTrue(true);
+    }
+}