Use query method instead of direct property access

Author: sebastianbergmann

src/Framework/MockObject/Runtime/Api/MutableStubApi.php

@@ -26,12 +26,12 @@ public function __phpunit_state(): TestDoubleState
     /** @noinspection MagicMethodsValidityInspection */
     public function __phpunit_getInvocationHandler(): InvocationHandler
     {
-        return $this->__phpunit_state->invocationHandler();
+        return $this->__phpunit_state()->invocationHandler();
     }
 
     /** @noinspection MagicMethodsValidityInspection */
     public function __phpunit_unsetInvocationMocker(): void
     {
-        $this->__phpunit_state->unsetInvocationHandler();
+        $this->__phpunit_state()->unsetInvocationHandler();
     }
 }

src/Framework/MockObject/Runtime/Api/StubApi.php

@@ -24,12 +24,12 @@ public function __phpunit_state(): TestDoubleState
     /** @noinspection MagicMethodsValidityInspection */
     public function __phpunit_getInvocationHandler(): InvocationHandler
     {
-        return $this->__phpunit_state->invocationHandler();
+        return $this->__phpunit_state()->invocationHandler();
     }
 
     /** @noinspection MagicMethodsValidityInspection */
     public function __phpunit_unsetInvocationMocker(): void
     {
-        $this->__phpunit_state->unsetInvocationHandler();
+        $this->__phpunit_state()->unsetInvocationHandler();
     }
 }