at the end of the day, it was inevitable

tests/Helper/AccessorTrait.php

@@ -0,0 +1,30 @@
+<?php
+
+namespace Tests\Helper;
+
+/**
+ * Class AccessorTrait
+ * @package Tests\Helper
+ */
+trait AccessorTrait
+{
+
+    /**
+     * Call specified method of given object.
+     *
+     * @param object $object    Some object.
+     * @param string $method    Called method name.
+     * @param array  $arguments Method parameters.
+     *
+     * @return mixed
+     */
+    public function call($object, $method, array $arguments = [])
+    {
+        $caller = function () use ($method, $arguments) {
+            return call_user_func_array([ $this, $method ], $arguments);
+        };
+        $caller = $caller->bindTo($object, $object);
+
+        return $caller();
+    }
+}