diff --git a/sentio_prober_control/UnitTest/TestProbeCommandGroup.py b/sentio_prober_control/UnitTest/TestProbeCommandGroup.py
new file mode 100644
index 0000000..8106552
--- /dev/null
+++ b/sentio_prober_control/UnitTest/TestProbeCommandGroup.py
@@ -0,0 +1,56 @@
+import unittest
+from unittest.mock import MagicMock
+from sentio_prober_control.Communication.CommunicatorBase import CommunicatorBase
+from sentio_prober_control.Sentio.Enumerations import ProbeSentio, ProbeXYReference, ProbeZReference
+from sentio_prober_control.Sentio.Response import Response
+from sentio_prober_control.Sentio.CommandGroups.ProbeCommandGroup import ProbeCommandGroup
+from sentio_prober_control.Communication.CommunicatorTcpIp import CommunicatorTcpIp
+from sentio_prober_control.Sentio.ProberSentio import SentioProber
+class TestProbeCommandGroup(unittest.TestCase):
+    def setUp(self):
+        # Mock the concrete TCP/IP communicator instead of CommunicatorBase
+        self.mock_comm = MagicMock(spec=CommunicatorTcpIp)
+
+        # Ensure the mock provides `send` and `read_line` methods
+        self.test_prober = SentioProber(self.mock_comm)
+    def test_async_step_probe_site(self):
+        self.mock_comm.read_line.return_value = "0,123,OK"
+        cmd_id = self.test_prober.probe.async_step_probe_site(ProbeSentio.East, 1)
+        self.mock_comm.send.assert_called_with("start_step_positioner_site East,1")
+        self.assertEqual(cmd_id, 123)
+
+    #----Command is different of document, waiting the fix by another PR---
+    # def test_get_probe_site(self):
+    #     self.mock_comm.read_line.return_value = "0,0,site1,1000,2000"
+    #     result = self.test_prober.probe.get_probe_site(ProbeSentio.East, 0)
+    #     self.mock_comm.send.assert_called_with("get_positioner_site East,0")
+    #     self.assertEqual(result, (0, "site1", 1000.0, 2000.0))
+
+    def test_get_probe_xy(self):
+        self.mock_comm.read_line.return_value = "0,0,1500,2500"
+        result = self.test_prober.probe.get_probe_xy(ProbeSentio.West, ProbeXYReference.Current)
+        self.mock_comm.send.assert_called_with("get_positioner_xy West,Current")
+        self.assertEqual(result, (1500.0, 2500.0))
+    #
+    def test_get_probe_z(self):
+        self.mock_comm.read_line.return_value = "0,0,500"
+        result = self.test_prober.probe.get_probe_z(ProbeSentio.North, ProbeZReference.Zero)
+        self.mock_comm.send.assert_called_with("get_positioner_z North,Zero")
+        self.assertEqual(result, 500.0)
+
+    # ---missing the relative---
+    def test_move_probe_xy(self):
+        self.mock_comm.read_line.return_value = "0,0,3000,4000"
+        result = self.test_prober.probe.move_probe_xy(ProbeSentio.South, ProbeXYReference.Home, 3000, 4000)
+        self.mock_comm.send.assert_called_with("move_positioner_xy South,Home,3000,4000")
+        self.assertEqual(result, (3000.0, 4000.0))
+
+    def test_move_probe_z(self):
+        self.mock_comm.read_line.return_value = "0,0,1200"
+        result = self.test_prober.probe.move_probe_z(ProbeSentio.West, ProbeZReference.Contact, 1200)
+        self.mock_comm.send.assert_called_with("move_positioner_z West,Contact,1200")
+        self.assertEqual(result, 1200.0)
+
+
+if __name__ == "__main__":
+    unittest.main()
diff --git a/sentio_prober_control/UnitTest/__init__.py b/sentio_prober_control/UnitTest/__init__.py
new file mode 100644
index 0000000..e69de29