diff --git a/tests/unit/test_object_3d.py b/tests/unit/test_object_3d.py
new file mode 100644
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+++ b/tests/unit/test_object_3d.py
@@ -0,0 +1,50 @@
+# -*- coding: utf-8 -*-
+#
+# Copyright (C) 2021 - 2025 ANSYS, Inc. and/or its affiliates.
+# SPDX-License-Identifier: MIT
+#
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in all
+# copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+
+from unittest.mock import MagicMock
+from unittest.mock import patch
+
+from ansys.aedt.core.generic.errors import AEDTRuntimeError
+from ansys.aedt.core.modeler.cad.object_3d import Object3d
+import pytest
+
+
+@pytest.fixture
+def object_3d_setup():
+    """Fixture used to mock the creation of a Object3d instance."""
+    with patch("ansys.aedt.core.modeler.cad.object_3d.Object3d.__init__", lambda x: None):
+        mock_instance = MagicMock(spec=Object3d)
+        yield mock_instance
+
+
+def test_clone_failure(object_3d_setup):
+    mock_primitives = MagicMock()
+    mock_primitives.clone.return_value = [False]
+    object_3d = Object3d()
+    object_3d._primitives = mock_primitives
+    object_3d._m_name = "dummy"
+    object_3d._id = 12
+
+    with pytest.raises(AEDTRuntimeError, match="Could not clone the object dummy"):
+        object_3d.clone()