Create unit tests CircularGaugeVisualization

src/Reveal.Sdk.Dom.Tests/Visualizations/CircularGaugeVisualizationFixture.cs

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+using System.Collections.Generic;
+using Newtonsoft.Json;
+using Newtonsoft.Json.Linq;
+using Reveal.Sdk.Dom.Data;
+using Reveal.Sdk.Dom.Visualizations;
+using Xunit;
+
+namespace Reveal.Sdk.Dom.Tests.Visualizations;
+
+public class CircularGaugeVisualizationFixture
+{
+    [Fact]
+    public void Constructor_FieldsHaveDefaultValues_WhenInstanceIsCreated()
+    {
+        // Act
+        var visualization = new CircularGaugeVisualization();
+
+        // Assert
+        Assert.Null(visualization.Title);
+        Assert.Null(visualization.DataDefinition);
+        Assert.Equal(ChartType.CircularGauge, visualization.ChartType);
+    }
+
+    [Fact]
+    public void Constructor_SetsDataSourceItem_WhenOnlyDataSourceItemProvided()
+    {
+        // Arrange
+        var dataSourceItem = new DataSourceItem();
+
+        // Act
+        var visualization = new CircularGaugeVisualization(dataSourceItem);
+
+        // Assert
+        Assert.Equal(dataSourceItem, visualization.DataDefinition.DataSourceItem);
+        Assert.Equal(ChartType.CircularGauge, visualization.ChartType);
+    }
+
+    [Fact]
+    public void Constructor_SetsTitleAndDataSourceItem_WhenBothArgumentsAreProvided()
+    {
+        // Arrange
+        var title = "Test Circular Gauge";
+        var dataSourceItem = new DataSourceItem();
+
+        // Act
+        var visualization = new CircularGaugeVisualization(title, dataSourceItem);
+
+        // Assert
+        Assert.Equal(title, visualization.Title);
+        Assert.Equal(dataSourceItem, visualization.DataDefinition.DataSourceItem);
+        Assert.Equal(ChartType.CircularGauge, visualization.ChartType);
+    }
+
+    [Fact]
+    public void ToJsonString_GeneratesCorrectJson_WhenSerialized()
+    {
+        // Arrange
+        var expectedJson =
+            """
+            [ {
+              "Id" : "c46b1e2f-9e71-4d98-b862-6d0b5b0c78b8",
+              "Title" : "Circular Gauge",
+              "IsTitleVisible" : true,
+              "ColumnSpan" : 0,
+              "RowSpan" : 0,
+              "VisualizationSettings" : {
+                "_type" : "GaugeVisualizationSettingsType",
+                "ViewType" : "Circular",
+                "GaugeBands" : [ {
+                  "_type" : "GaugeBandType",
+                  "Type" : "Percentage",
+                  "Color" : "Green",
+                  "Value" : 80.0
+                }, {
+                  "_type" : "GaugeBandType",
+                  "Type" : "Percentage",
+                  "Color" : "Yellow",
+                  "Value" : 30.0
+                }, {
+                  "_type" : "GaugeBandType",
+                  "Type" : "Percentage",
+                  "Color" : "Red"
+                } ],
+                "VisualizationType" : "GAUGE"
+              },
+              "DataSpec" : {
+                "_type" : "TabularDataSpecType",
+                "IsTransposed" : false,
+                "Fields" : [ {
+                  "FieldName" : "Budget",
+                  "FieldLabel" : "Budget",
+                  "UserCaption" : "Budget",
+                  "IsCalculated" : false,
+                  "Properties" : { },
+                  "Sorting" : "None",
+                  "FieldType" : "Number"
+                }, {
+                  "FieldName" : "Spend",
+                  "FieldLabel" : "Spend",
+                  "UserCaption" : "Spend",
+                  "IsCalculated" : false,
+                  "Properties" : { },
+                  "Sorting" : "None",
+                  "FieldType" : "Number"
+                } ],
+                "TransposedFields" : [ ],
+                "QuickFilters" : [ ],
+                "AdditionalTables" : [ ],
+                "ServiceAdditionalTables" : [ ],
+                "DataSourceItem" : {
+                  "_type" : "DataSourceItemType",
+                  "Id" : "080cc17d-4a0a-4837-aa3f-ef2571ea443a",
+                  "Title" : "Sample Data",
+                  "DataSourceId" : "__EXCEL",
+                  "HasTabularData" : true,
+                  "HasAsset" : false,
+                  "Properties" : {
+                    "Sheet" : "Marketing"
+                  },
+                  "Parameters" : { },
+                  "ResourceItem" : {
+                    "_type" : "DataSourceItemType",
+                    "Id" : "d593dd79-7161-4929-afc9-c26393f5b650",
+                    "Title" : "Marketing Sheet",
+                    "Subtitle" : "Excel Data Source Item",
+                    "DataSourceId" : "33077d1e-19c5-44fe-b981-6765af3156a6",
+                    "HasTabularData" : true,
+                    "HasAsset" : false,
+                    "Properties" : {
+                      "Url" : "http://dl.infragistics.com/reportplus/reveal/samples/Samples.xlsx"
+                    },
+                    "Parameters" : { }
+                  }
+                },
+                "Expiration" : 1440,
+                "Bindings" : {
+                  "Bindings" : [ ]
+                }
+              },
+              "VisualizationDataSpec" : {
+                "_type" : "SingleGaugeVisualizationDataSpecType",
+                "Label" : {
+                  "_type" : "DimensionColumnSpecType",
+                  "SummarizationField" : {
+                    "_type" : "SummarizationRegularFieldType",
+                    "DrillDownElements" : [ ],
+                    "ExpandedItems" : [ ],
+                    "FieldName" : "Budget"
+                  }
+                },
+                "Value" : [ {
+                  "_type" : "MeasureColumnSpecType",
+                  "SummarizationField" : {
+                    "_type" : "SummarizationValueFieldType",
+                    "FieldLabel" : "Spend",
+                    "UserCaption" : "Spend",
+                    "IsHidden" : false,
+                    "AggregationType" : "Sum",
+                    "Sorting" : "None",
+                    "IsCalculated" : false,
+                    "FieldName" : "Spend"
+                  }
+                } ]
+              }
+            } ]
+            """;
+
+        var document = new RdashDocument("Dashboard");
+
+        var dataSourceItem = new RestDataSourceItem("Sample Data")
+        {
+            Id = "080cc17d-4a0a-4837-aa3f-ef2571ea443a",
+            Url = "http://dl.infragistics.com/reportplus/reveal/samples/Samples.xlsx",
+            IsAnonymous = true,
+            ResourceItem = new DataSourceItem
+            {
+                Id = "d593dd79-7161-4929-afc9-c26393f5b650",
+                DataSourceId = "33077d1e-19c5-44fe-b981-6765af3156a6",
+                Title = "Marketing Sheet",
+                Subtitle = "Excel Data Source Item",
+                HasTabularData = true,
+                HasAsset = false,
+                Properties = new Dictionary<string, object>
+                {
+                    { "Url", "http://dl.infragistics.com/reportplus/reveal/samples/Samples.xlsx" }
+                }
+            },
+            Fields = new List<IField>
+            {
+                new NumberField("Budget"),
+                new NumberField("Spend"),
+            }
+        };
+
+        dataSourceItem.UseExcel("Marketing");
+
+        document.Visualizations.Add(new CircularGaugeVisualization("Circular Gauge", dataSourceItem)
+        {
+            Id = "c46b1e2f-9e71-4d98-b862-6d0b5b0c78b8",
+            IsTitleVisible = true,
+        }
+            .SetLabel("Budget")
+            .SetValue("Spend")
+        .ConfigureSettings(settings =>
+        {
+            settings.MiddleBand.Value = 30;
+        }));
+
+        // Act
+        var json = document.ToJsonString();
+        var actualJson = JObject.Parse(json)["Widgets"];
+        var actualNormalized = JsonConvert.SerializeObject(actualJson, Formatting.Indented);
+        var expectedNormalized = JArray.Parse(expectedJson).ToString(Formatting.Indented);
+
+        // Assert
+        Assert.Equal(expectedNormalized.Trim(), actualNormalized.Trim());
+    }
+}