diff --git a/tests/test_line_plot.py b/tests/test_line_plot.py
new file mode 100644
index 00000000..53aebb5e
--- /dev/null
+++ b/tests/test_line_plot.py
@@ -0,0 +1,146 @@
+from pytestqt import qtbot
+from unittest import mock
+from bec_widgets import line_plot
+import numpy as np
+
+
+def test_line_plot_emits_no_signal(qtbot):
+    """Test LinePlot emits no signal when only one data entry is present."""
+
+    y_value_list = ["y1", "y2"]
+    plot = line_plot.BasicPlot(y_value_list=y_value_list)
+    data = {
+        "data": {
+            "x": {"x": {"value": 1}},
+            "y1": {"y1": {"value": 1}},
+            "y2": {"y2": {"value": 3}},
+        }
+    }
+    metadata = {"scanID": "test", "scan_number": 1, "scan_report_devices": ["x"]}
+    with mock.patch("bec_widgets.line_plot.BECClient") as mock_client:
+        with mock.patch.object(plot, "update_signal") as mock_update_signal:
+            plot(data=data, metadata=metadata)
+            mock_update_signal.emit.assert_not_called()
+
+
+def test_line_plot_emits_signal(qtbot):
+    """Test LinePlot emits signal."""
+
+    y_value_list = ["y1", "y2"]
+    plot = line_plot.BasicPlot(y_value_list=y_value_list)
+    data = {
+        "data": {
+            "x": {"x": {"value": 1}},
+            "y1": {"y1": {"value": 1}},
+            "y2": {"y2": {"value": 3}},
+        }
+    }
+    plotter_data_y = [[1, 1], [3, 3]]
+    metadata = {"scanID": "test", "scan_number": 1, "scan_report_devices": ["x"]}
+    with mock.patch("bec_widgets.line_plot.BECClient") as mock_client:
+        # mock_client.device_manager.devices.keys.return_value = ["y1"]
+        with mock.patch.object(plot, "update_signal") as mock_update_signal:
+            mock_update_signal.emit()
+            plot(data=data, metadata=metadata)
+            plot(data=data, metadata=metadata)
+            mock_update_signal.emit.assert_called()
+            # TODO allow mock_client to create return values for device_manager_devices
+            # assert plot.plotter_data_y == plotter_data_y
+
+
+def test_line_plot_raise_warning_wrong_signal_request(qtbot):
+    """Test LinePlot raises warning and skips signal when entry not present in data."""
+
+    y_value_list = ["y1", "y22"]
+    plot = line_plot.BasicPlot(y_value_list=y_value_list)
+    data = {
+        "data": {
+            "x": {"x": {"value": [1, 2, 3, 4, 5]}},
+            "y1": {"y1": {"value": [1, 2, 3, 4, 5]}},
+            "y2": {"y2": {"value": [1, 2, 3, 4, 5]}},
+        }
+    }
+    metadata = {"scanID": "test", "scan_number": 1, "scan_report_devices": ["x"]}
+    with mock.patch("bec_widgets.line_plot.BECClient") as mock_client:
+        # TODO fix mock_client
+        mock_client.device_manager.devices.keys.return_value = ["y1"]
+        # = {"y1": [1, 2]}
+        with mock.patch.object(plot, "update_signal") as mock_update_signal:
+            mock_update_signal.emit()
+            plot(data=data, metadata=metadata)
+            assert all(plot.y_value_list == ["y1"])
+
+
+def test_line_plot_update(qtbot):
+    """Test LinePlot update."""
+
+    y_value_list = ["y1", "y2"]
+    plot = line_plot.BasicPlot(y_value_list=y_value_list)
+    plot.label_bottom = "x"
+    plot.label_left = f"{', '.join(y_value_list)}"
+    plot.plotter_data_x = [1, 2, 3, 4, 5]
+    plot.plotter_data_y = [[1, 2, 3, 4, 5], [3, 4, 5, 6, 7]]
+    plot.update()
+
+    assert all(plot.curves[0].getData()[0] == np.array([1, 2, 3, 4, 5]))
+    assert all(plot.curves[0].getData()[1] == np.array([1, 2, 3, 4, 5]))
+    assert all(plot.curves[1].getData()[1] == np.array([3, 4, 5, 6, 7]))
+
+
+# TODO Outputting the wrong data, e.g. motor is not in list of devices
+def test_line_plot_update(qtbot):
+    """Test LinePlot update."""
+
+    y_value_list = ["y1", "y2"]
+    plot = line_plot.BasicPlot(y_value_list=y_value_list)
+    plot.label_bottom = "x"
+    plot.label_left = f"{', '.join(y_value_list)}"
+    plot.plotter_data_x = [1, 2, 3, 4, 5]
+    plot.plotter_data_y = [[1, 2, 3, 4, 5], [3, 4, 5, 6, 7]]
+    plot.update()
+
+    assert all(plot.curves[0].getData()[0] == np.array([1, 2, 3, 4, 5]))
+    assert all(plot.curves[0].getData()[1] == np.array([1, 2, 3, 4, 5]))
+    assert all(plot.curves[1].getData()[1] == np.array([3, 4, 5, 6, 7]))
+
+
+def test_line_plot_mouse_moved(qtbot):
+    """Test LinePlot mouse_moved."""
+
+    y_value_list = ["y1", "y2"]
+    plot = line_plot.BasicPlot(y_value_list=y_value_list)
+    plot.plotter_data_x = [1, 2, 3, 4, 5]
+    plot.plotter_data_y = [[1, 2, 3, 4, 5], [3, 4, 5, 6, 7]]
+    plot.precision = 3
+    string_cap = 10
+    x_data = f"{3:.{plot.precision}f}"
+    y_data = f"{3:.{plot.precision}f}"
+    output_string = "".join(
+        [
+            "Mouse cursor",
+            "\n",
+            f"{y_value_list[0]}",
+            "\n",
+            f"X_data:   {x_data:>{string_cap}}",
+            "\n",
+            f"Y_data: {y_data:>{string_cap}}",
+        ]
+    )
+    x_data = f"{3:.{plot.precision}f}"
+    y_data = f"{5:.{plot.precision}f}"
+    output_string = "".join(
+        [
+            output_string,
+            "\n",
+            f"{y_value_list[1]}",
+            "\n",
+            f"X_data:   {x_data:>{string_cap}}",
+            "\n",
+            f"Y_data: {y_data:>{string_cap}}",
+        ]
+    )
+    with mock.patch.object(plot, "plot") as mock_plot:
+        mock_plot.sceneBoundingRect.contains.return_value = True
+        mock_plot.vb.mapSceneToView((20, 10)).x.return_value = 2.8
+        plot.mouse_moved((20, 10))
+        assert plot.mouse_box_data.text() == output_string