diff --git a/src/Reveal.Sdk.Dom.Tests/Visualizations/Settings/PieChartVisualizationSettingsFixture.cs b/src/Reveal.Sdk.Dom.Tests/Visualizations/Settings/PieChartVisualizationSettingsFixture.cs
new file mode 100644
index 00000000..8ea8a03b
--- /dev/null
+++ b/src/Reveal.Sdk.Dom.Tests/Visualizations/Settings/PieChartVisualizationSettingsFixture.cs
@@ -0,0 +1,56 @@
+using Newtonsoft.Json;
+using Newtonsoft.Json.Linq;
+using Reveal.Sdk.Dom.Core.Constants;
+using Reveal.Sdk.Dom.Visualizations;
+using Reveal.Sdk.Dom.Visualizations.Settings;
+using Xunit;
+
+namespace Reveal.Sdk.Dom.Tests.Visualizations.Settings;
+
+public class PieChartVisualizationSettingsFixture
+{
+    [Fact]
+    public void Constructor_FieldsHaveDefaultValues_WhenInstanceIsCreated()
+    {
+        // Act
+        var settings = new PieChartVisualizationSettings();
+
+        // Assert
+        Assert.Equal(RdashChartType.Pie, settings.ChartType);
+    }
+
+    [Fact]
+    public void ToJsonString_GeneratesCorrectJson_WhenSerialized()
+    {
+        // Arrange
+        var expectedJson =
+            """
+            {
+              "_type" : "ChartVisualizationSettingsType",
+              "ShowZeroValuesInLegend" : false,
+              "ShowLegends" : true,
+              "LabelDisplayMode" : "Percentage",
+              "OthersSliceThreshold" : 3.0,
+              "ChartType" : "Pie",
+              "VisualizationType" : "CHART"
+            }
+            """;
+
+        var settings = new PieChartVisualizationSettings
+        {
+            ShowLegend = true,
+            StartColorIndex = null,
+            OthersSliceThreshold = 3.0,
+            StartPosition = null,
+            ShowZeroValuesInLegend = false
+        };
+
+        // Act
+        var actualJson = settings.ToJsonString();
+        var expectedJObject = JObject.Parse(expectedJson);
+        var actualJObject = JObject.Parse(actualJson);
+
+        // Assert
+        Assert.Equal(expectedJObject, actualJObject);
+    }
+}
\ No newline at end of file