Stop using __mocked field in objects created by Stub library

composer.json

@@ -21,7 +21,7 @@
         "ext-mbstring": "*",
         "behat/gherkin": "^4.6.2",
         "codeception/lib-asserts": "2.0.*@dev",
-        "codeception/stub": "^3.7 | ^4.0",
+        "codeception/stub": "^4.1",
         "phpunit/phpunit": "^9.5",
         "phpunit/php-code-coverage": "^9.2",
         "phpunit/php-text-template": "^2.0",

src/Codeception/Step.php

@@ -185,8 +185,24 @@ protected function getClassName(object $argument): string
     {
         if ($argument instanceof Closure) {
             return Closure::class;
-        } elseif ($argument instanceof MockObject && (property_exists($argument, '__mocked') && $argument->__mocked !== null)) {
-            return $this->formatClassName($argument->__mocked);
+        } elseif ($argument instanceof MockObject) {
+            $parentClass = get_parent_class($argument);
+            $reflection = new \ReflectionClass($argument);
+
+            if ($parentClass !== false) {
+                return $this->formatClassName($parentClass);
+            }
+
+            $interfaces = $reflection->getInterfaceNames();
+            foreach ($interfaces as $interface) {
+                if (str_starts_with($interface, 'PHPUnit\\')) {
+                    continue;
+                }
+                if (str_starts_with($interface, 'Codeception\\')) {
+                    continue;
+                }
+                return $this->formatClassName($interface);
+            }
         }
 
         return $this->formatClassName($argument::class);

tests/data/DummyOverloadableClass.php

@@ -57,15 +57,11 @@ public function exceptionalMethod(): void
 
     public function __get($name)
     {
-        //seeing as we're not implementing __set here, add check for __mocked
-        $return = null;
-        if ($name === '__mocked') {
-            $return = $this->__mocked ?? null;
-        } elseif ($this->__isset($name)) {
-            $return = $this->properties[$name];
+        if ($this->__isset($name)) {
+            return $this->properties[$name];
         }
 
-        return $return;
+        return null;
     }
 
     public function __isset($name)

tests/unit/Codeception/StepTest.php

@@ -43,8 +43,7 @@ public function testGetArguments()
 
         $mock = $this->createMock($this::class);
         $step = $this->getStep(['', [[$mock, 'testGetArguments']]]);
-        $className = $mock::class;
-        $this->assertSame('["' . $className . '","testGetArguments"]', $step->getArgumentsAsString());
+        $this->assertSame('["StepTest","testGetArguments"]', $step->getArgumentsAsString());
     }
 
     public function testGetHtml()