diff --git a/test/IteratorMockTrait.php b/test/IteratorMockTrait.php
new file mode 100644
index 000000000..3058e4a38
--- /dev/null
+++ b/test/IteratorMockTrait.php
@@ -0,0 +1,106 @@
+<?php
+
+/**
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; under version 2
+ * of the License (non-upgradable).
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ *
+ * Copyright (c) 2021 (original work) Open Assessment Technologies SA;
+ */
+
+declare(strict_types=1);
+
+namespace oat\generis\test;
+
+use stdClass;
+use PHPUnit\Framework\MockObject\MockObject;
+
+trait IteratorMockTrait
+{
+    public function createIteratorMock(string $originalClassName, array $items = []): MockObject
+    {
+        $iteratorData = new stdClass();
+        $iteratorData->array = $items;
+        $iteratorData->position = 0;
+
+        $iteratorMock = $this->createMock($originalClassName);
+
+        $iteratorMock
+            ->expects($this->any())
+            ->method('rewind')
+            ->will(
+                $this->returnCallback(
+                    static function() use ($iteratorData): void {
+                        $iteratorData->position = 0;
+                    }
+                )
+            );
+
+        $iteratorMock
+            ->expects($this->any())
+            ->method('current')
+            ->will(
+                $this->returnCallback(
+                    static function() use ($iteratorData) {
+                        return $iteratorData->array[$iteratorData->position];
+                    }
+                )
+            );
+
+        $iteratorMock
+            ->expects($this->any())
+            ->method('key')
+            ->will(
+                $this->returnCallback(
+                    static function() use ($iteratorData) {
+                        return $iteratorData->position;
+                    }
+                )
+            );
+
+        $iteratorMock
+            ->expects($this->any())
+            ->method('next')
+            ->will(
+                $this->returnCallback(
+                    static function() use ($iteratorData): void {
+                        ++$iteratorData->position;
+                    }
+                )
+            );
+
+        $iteratorMock
+            ->expects($this->any())
+            ->method('valid')
+            ->will(
+                $this->returnCallback(
+                    static function() use ($iteratorData): bool {
+                        return isset($iteratorData->array[$iteratorData->position]);
+                    }
+                )
+            );
+
+        $iteratorMock
+            ->expects($this->any())
+            ->method('count')
+            ->will(
+                $this->returnCallback(
+                    static function() use ($iteratorData): int {
+                        return count($iteratorData->array);
+                    }
+                )
+            );
+
+        return $iteratorMock;
+    }
+}