diff --git a/tests/test_bec_monitor_scatter2D.py b/tests/test_bec_monitor_scatter2D.py
index e192c66e..2855f778 100644
--- a/tests/test_bec_monitor_scatter2D.py
+++ b/tests/test_bec_monitor_scatter2D.py
@@ -1,7 +1,173 @@
-import os
-import yaml
+# pylint: disable=missing-module-docstring, missing-function-docstring
 
 import pytest
 from unittest.mock import MagicMock
+from qtpy import QtGui
 
-from bec_widgets.widgets import BEC
+from bec_widgets.widgets import BECMonitor2DScatter
+
+CONFIG_DEFAULT = {
+    "plot_settings": {
+        "colormap": "CET-L4",
+        "num_columns": 1,
+    },
+    "waveform2D": [
+        {
+            "plot_name": "Waveform 2D Scatter (1)",
+            "x_label": "Sam X",
+            "y_label": "Sam Y",
+            "signals": {
+                "x": [{"name": "samx", "entry": "samx"}],
+                "y": [{"name": "samy", "entry": "samy"}],
+                "z": [{"name": "gauss_bpm", "entry": "gauss_bpm"}],
+            },
+        },
+        {
+            "plot_name": "Waveform 2D Scatter (2)",
+            "x_label": "Sam X",
+            "y_label": "Sam Y",
+            "signals": {
+                "x": [{"name": "samy", "entry": "samy"}],
+                "y": [{"name": "samx", "entry": "samx"}],
+                "z": [{"name": "gauss_bpm", "entry": "gauss_bpm"}],
+            },
+        },
+    ],
+}
+
+CONFIG_ONE_PLOT = {
+    "plot_settings": {
+        "colormap": "CET-L4",
+        "num_columns": 1,
+    },
+    "waveform2D": [
+        {
+            "plot_name": "Waveform 2D Scatter (1)",
+            "x_label": "Sam X",
+            "y_label": "Sam Y",
+            "signals": {
+                "x": [{"name": "aptrx", "entry": "aptrx"}],
+                "y": [{"name": "aptry", "entry": "aptry"}],
+                "z": [{"name": "gauss_bpm", "entry": "gauss_bpm"}],
+            },
+        },
+    ],
+}
+
+
+@pytest.fixture(scope="function")
+def monitor_2Dscatter(qtbot):
+    client = MagicMock()
+    widget = BECMonitor2DScatter(client=client)
+    qtbot.addWidget(widget)
+    qtbot.waitExposed(widget)
+    yield widget
+
+
+@pytest.mark.parametrize(
+    "config, number_of_plots",
+    [
+        (CONFIG_DEFAULT, 2),
+        (CONFIG_ONE_PLOT, 1),
+    ],
+)
+def test_initialization(monitor_2Dscatter, config, number_of_plots):
+    config_load = config
+    monitor_2Dscatter.on_config_update(config_load)
+    assert isinstance(monitor_2Dscatter, BECMonitor2DScatter)
+    assert monitor_2Dscatter.client is not None
+    assert monitor_2Dscatter.config == config_load
+    assert len(monitor_2Dscatter.plot_data) == number_of_plots
+
+
+@pytest.mark.parametrize(
+    "config ",
+    [
+        (CONFIG_DEFAULT),
+        (CONFIG_ONE_PLOT),
+    ],
+)
+def test_database_initialization(monitor_2Dscatter, config):
+    monitor_2Dscatter.on_config_update(config)
+    for plot_config in config["waveform2D"]:
+        plot_name = plot_config["plot_name"]
+        assert plot_name in monitor_2Dscatter.database
+        assert all(axis in monitor_2Dscatter.database[plot_name] for axis in ["x", "y", "z"])
+
+
+@pytest.mark.parametrize(
+    "config ",
+    [
+        (CONFIG_DEFAULT),
+        (CONFIG_ONE_PLOT),
+    ],
+)
+def test_ui_initialization(monitor_2Dscatter, config):
+    monitor_2Dscatter.on_config_update(config)
+    assert len(monitor_2Dscatter.plots) == len(config["waveform2D"])
+    for plot_config in config["waveform2D"]:
+        plot_name = plot_config["plot_name"]
+        assert plot_name in monitor_2Dscatter.plots
+        plot = monitor_2Dscatter.plots[plot_name]
+        assert plot.titleLabel.text == plot_name
+
+
+def simulate_scan_data(monitor, x_value, y_value, z_value):
+    """Helper function to simulate scan data input with three devices."""
+    msg = {
+        "data": {
+            "samx": {"samx": {"value": x_value}},
+            "samy": {"samy": {"value": y_value}},
+            "gauss_bpm": {"gauss_bpm": {"value": z_value}},
+        },
+        "scanID": 1,
+    }
+    monitor.on_scan_segment(msg, {})
+
+
+def test_data_update_and_plotting(monitor_2Dscatter, qtbot):
+    monitor_2Dscatter.on_config_update(CONFIG_DEFAULT)
+    data_sets = [(1, 4, 7), (2, 5, 8), (3, 6, 9)]  # (x, y, z) tuples
+    plot_name = "Waveform 2D Scatter (1)"
+
+    for x, y, z in data_sets:
+        simulate_scan_data(monitor_2Dscatter, x, y, z)
+        qtbot.wait(100)  # Wait for the plot to update
+
+    # Retrieve the plot and check if the number of data points matches
+    scatterPlot = monitor_2Dscatter.scatterPlots[plot_name]
+    assert len(scatterPlot.data) == len(data_sets)
+
+    # Check if the data in the database matches the sent data
+    x_data = [
+        point
+        for points_list in monitor_2Dscatter.database[plot_name]["x"].values()
+        for point in points_list
+    ]
+    y_data = [
+        point
+        for points_list in monitor_2Dscatter.database[plot_name]["y"].values()
+        for point in points_list
+    ]
+    z_data = [
+        point
+        for points_list in monitor_2Dscatter.database[plot_name]["z"].values()
+        for point in points_list
+    ]
+
+    assert x_data == [x for x, _, _ in data_sets]
+    assert y_data == [y for _, y, _ in data_sets]
+    assert z_data == [z for _, _, z in data_sets]
+
+
+def test_color_mapping(monitor_2Dscatter, qtbot):
+    monitor_2Dscatter.on_config_update(CONFIG_DEFAULT)
+    data_sets = [(1, 4, 7), (2, 5, 8), (3, 6, 9)]  # (x, y, z) tuples
+    for x, y, z in data_sets:
+        simulate_scan_data(monitor_2Dscatter, x, y, z)
+        qtbot.wait(100)  # Wait for the plot to update
+
+    scatterPlot = monitor_2Dscatter.scatterPlots["Waveform 2D Scatter (1)"]
+
+    # Check if colors are applied
+    assert all(isinstance(point.brush().color(), QtGui.QColor) for point in scatterPlot.points())