[TASK] Provide a test to demonstrate a regresision

This change adds a fixture class and a MockBuilder test
to showcase a regression introduced with version 11.2.0.

Given is a class, where one method is mocked using the
`onlyMethods()` option to check the method gets called.
The method is called in the class constructor and also
in other public method.

Providing a test mocking that method this breaks since
11.2.0 - albeit having the count in previous version
only working for calls to the mock method AFTER the
constructor call.

Following exception thrown is not expectd:

    Error: Typed property
    MockObject_ClassCallingMethodInConstructor_b5ada611::$__phpunit_state
    must not be accessed before initialization

Related: #5857

tests/PHPUnit/TestFixture/MockObject/ClassCallingMethodInConstructor.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 PHPUnit\TestFixture\MockObject;
+
+class ClassCallingMethodInConstructor
+{
+    public function __construct()
+    {
+        $this->reset();
+    }
+
+    public function reset(): void
+    {
+    }
+
+    public function second(): void
+    {
+        $this->reset();
+    }
+}

tests/unit/Framework/MockObject/Creation/MockBuilderTest.php

@@ -9,6 +9,7 @@
  */
 namespace PHPUnit\Framework\MockObject;
 
+use PHPUnit\TestFixture\MockObject\ClassCallingMethodInConstructor;
 use function assert;
 use function class_exists;
 use function interface_exists;
@@ -165,4 +166,15 @@ public function testCreatesMockObjectForUnknownType(): void
         $this->assertInstanceOf(MockObject::class, $double);
 
     }
+
+    #[TestDox('onlyMethods() mocked methods can be called within the original constructor')]
+    public function testOnlyMethodCalledInConstructorWorks(): void
+    {
+        $testClassMock = $this->getMockBuilder(ClassCallingMethodInConstructor::class)
+            ->onlyMethods(['reset'])
+            ->getMock();
+
+        $testClassMock->expects($this::once())->method('reset');
+        $testClassMock->second();
+    }
 }