diff --git a/bec_widgets/utils/bec_connector.py b/bec_widgets/utils/bec_connector.py
index c77493e7..51d0cace 100644
--- a/bec_widgets/utils/bec_connector.py
+++ b/bec_widgets/utils/bec_connector.py
@@ -59,6 +59,7 @@ class BECConnector:
             gui_id(str): GUI ID
         """
         self.config.gui_id = gui_id
+        self.gui_id = gui_id
 
     def get_obj_by_id(self, obj_id: str):
         if obj_id == self.gui_id:
diff --git a/tests/client_mocks.py b/tests/client_mocks.py
index d4c9eccb..2a0aa428 100644
--- a/tests/client_mocks.py
+++ b/tests/client_mocks.py
@@ -49,7 +49,17 @@ def get_mocked_device(device_name: str):
 @pytest.fixture(scope="function")
 def mocked_client():
     # Create a dictionary of mocked devices
-    device_names = ["samx", "gauss_bpm", "gauss_adc1", "gauss_adc2", "gauss_adc3", "bpm4i"]
+    device_names = [
+        "samx",
+        "samy",
+        "gauss_bpm",
+        "gauss_adc1",
+        "gauss_adc2",
+        "gauss_adc3",
+        "bpm4i",
+        "bpm3a",
+        "bpm3i",
+    ]
     mocked_devices = {name: get_mocked_device(name) for name in device_names}
 
     # Create a MagicMock object
diff --git a/tests/test_bec_connector.py b/tests/test_bec_connector.py
new file mode 100644
index 00000000..4e50db2a
--- /dev/null
+++ b/tests/test_bec_connector.py
@@ -0,0 +1,55 @@
+import pytest
+
+from .client_mocks import mocked_client
+from bec_widgets.utils import BECConnector, ConnectionConfig
+
+
+@pytest.fixture
+def bec_connector(mocked_client):
+    connector = BECConnector(client=mocked_client)
+    return connector
+
+
+def test_bec_connector_init(bec_connector):
+    assert bec_connector is not None
+    assert bec_connector.client is not None
+    assert isinstance(bec_connector, BECConnector)
+    assert bec_connector.config.widget_class == "BECConnector"
+
+
+def test_bec_connector_init_with_gui_id(mocked_client):
+    bc = BECConnector(client=mocked_client, gui_id="test_gui_id")
+    assert bc.config.gui_id == "test_gui_id"
+    assert bc.gui_id == "test_gui_id"
+
+
+def test_bec_connector_set_gui_id(bec_connector):
+    bec_connector.set_gui_id("test_gui_id")
+    assert bec_connector.config.gui_id == "test_gui_id"
+
+
+def test_bec_connector_change_config(bec_connector):
+    bec_connector.on_config_update({"gui_id": "test_gui_id"})
+    assert bec_connector.config.gui_id == "test_gui_id"
+
+
+def test_bec_connector_get_obj_by_id(bec_connector):
+    bec_connector.set_gui_id("test_gui_id")
+    assert bec_connector.get_obj_by_id("test_gui_id") == bec_connector
+    assert bec_connector.get_obj_by_id("test_gui_id_2") is None
+
+
+def test_bec_connector_update_client(bec_connector, mocked_client):
+    client_new = mocked_client
+    bec_connector.update_client(client_new)
+    assert bec_connector.client == client_new
+    assert bec_connector.dev is not None
+    assert bec_connector.scans is not None
+    assert bec_connector.queue is not None
+    assert bec_connector.scan_storage is not None
+    assert bec_connector.dap is not None
+
+
+def test_bec_connector_get_config(bec_connector):
+    assert bec_connector.get_config(dict_output=False) == bec_connector.config
+    assert bec_connector.get_config() == bec_connector.config.model_dump()