Add test for #6138

Author: sebastianbergmann

tests/end-to-end/regression/6138.phpt

@@ -0,0 +1,40 @@
+--TEST--
+https://github.com/sebastianbergmann/phpunit/issues/6138
+--XFAIL--
+https://github.com/sebastianbergmann/phpunit/issues/6138
+--FILE--
+<?php declare(strict_types=1);
+$_SERVER['argv'][] = '--do-not-cache-result';
+$_SERVER['argv'][] = '--no-configuration';
+$_SERVER['argv'][] = __DIR__ . '/6138/Issue6138Test.php';
+
+require_once __DIR__ . '/../../bootstrap.php';
+
+(new PHPUnit\TextUI\Application)->run($_SERVER['argv']);
+--EXPECTF--
+PHPUnit %s by Sebastian Bergmann and contributors.
+
+Runtime: %s
+
+F                                                                   1 / 1 (100%)
+
+Time: %s, Memory: %s
+
+There was 1 failure:
+
+1) PHPUnit\TestFixture\Issue6138\Issue6138Test::testOne
+Expectation failed for method name is "m" when invoked 1 time
+Parameter 0 for invocation PHPUnit\TestFixture\Issue6138\I::m(PHPUnit\TestFixture\Issue6138\C Object (...)): void does not match expected value.
+Failed asserting that two objects are equal.
+--- Expected
++++ Actual
+@@ @@
+ PHPUnit\TestFixture\Issue6138\C Object (
+-    'foo' => 'bar'
++    'foo' => 'baz'
+ )
+
+%sIssue6138Test.php:%d
+
+FAILURES!
+Tests: 1, Assertions: 1, Failures: 1.

tests/end-to-end/regression/6138/Issue6138Test.php

@@ -0,0 +1,39 @@
+<?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 PHPUnit\TestFixture\Issue6138;
+
+use PHPUnit\Framework\TestCase;
+
+final class C
+{
+    private string $foo;
+
+    public function __construct(string $foo)
+    {
+        $this->foo = $foo;
+    }
+}
+
+interface I
+{
+    public function m(C $c): void;
+}
+
+final class Issue6138Test extends TestCase
+{
+    public function testOne(): void
+    {
+        $i = $this->createMock(I::class);
+
+        $i->expects($this->once())->method('m')->with(new C('bar'));
+
+        $i->m(new C('baz'));
+    }
+}