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+using Bunit;
+using SufiChain.SufiBlazor.Theming;
+using Xunit;
+
+namespace SufiChain.SufiBlazor.Tests.Theming;
+
+public class SbThemeProviderTests : BunitContext
+{
+    [Fact]
+    public void RendersWithDefaultLightTheme()
+    {
+        // Arrange & Act
+        var cut = Render<SbThemeProvider>(parameters => parameters
+            .AddChildContent("<p>Test Content</p>"));
+
+        // Assert
+        var rootElement = cut.Find(".sb-theme-root");
+        Assert.NotNull(rootElement);
+        Assert.Contains("sb-theme-light", rootElement.ClassList);
+        Assert.DoesNotContain("sb-theme-dark", rootElement.ClassList);
+    }
+
+    [Fact]
+    public void RendersWithDarkThemeWhenIsDarkIsTrue()
+    {
+        // Arrange & Act
+        var cut = Render<SbThemeProvider>(parameters => parameters
+            .Add(p => p.IsDark, true)
+            .AddChildContent("<p>Test Content</p>"));
+
+        // Assert
+        var rootElement = cut.Find(".sb-theme-root");
+        Assert.Contains("sb-theme-dark", rootElement.ClassList);
+        Assert.DoesNotContain("sb-theme-light", rootElement.ClassList);
+    }
+
+    [Fact]
+    public void RendersWithLtrDirectionByDefault()
+    {
+        // Arrange & Act
+        var cut = Render<SbThemeProvider>(parameters => parameters
+            .AddChildContent("<p>Test Content</p>"));
+
+        // Assert
+        var rootElement = cut.Find(".sb-theme-root");
+        Assert.Equal("ltr", rootElement.GetAttribute("dir"));
+        Assert.DoesNotContain("sb-rtl", rootElement.ClassList);
+    }
+
+    [Fact]
+    public void RendersWithRtlDirectionWhenDirectionIsRtl()
+    {
+        // Arrange & Act
+        var cut = Render<SbThemeProvider>(parameters => parameters
+            .Add(p => p.Direction, SbDirection.Rtl)
+            .AddChildContent("<p>Test Content</p>"));
+
+        // Assert
+        var rootElement = cut.Find(".sb-theme-root");
+        Assert.Equal("rtl", rootElement.GetAttribute("dir"));
+        Assert.Contains("sb-rtl", rootElement.ClassList);
+    }
+
+    [Fact]
+    public void RendersChildContent()
+    {
+        // Arrange
+        const string expectedContent = "Hello SufiBlazor";
+
+        // Act
+        var cut = Render<SbThemeProvider>(parameters => parameters
+            .AddChildContent($"<p>{expectedContent}</p>"));
+
+        // Assert
+        cut.MarkupMatches($"""<div class="sb-theme-root sb-theme-light" dir="ltr"><p>{expectedContent}</p></div>""");
+    }
+
+    [Fact]
+    public void AppliesCustomClass()
+    {
+        // Arrange & Act
+        var cut = Render<SbThemeProvider>(parameters => parameters
+            .Add(p => p.Class, "my-custom-class")
+            .AddChildContent("<p>Test</p>"));
+
+        // Assert
+        var rootElement = cut.Find(".sb-theme-root");
+        Assert.Contains("my-custom-class", rootElement.ClassList);
+    }
+
+    [Fact]
+    public void CascadesThemeContext()
+    {
+        // Arrange
+        SbThemeContext? capturedContext = null;
+        Action<SbThemeContext> onCaptured = ctx => capturedContext = ctx;
+
+        // Act
+        var cut = Render<SbThemeProvider>(parameters => parameters
+            .Add(p => p.IsDark, true)
+            .Add(p => p.Direction, SbDirection.Rtl)
+            .AddChildContent(builder =>
+            {
+                builder.OpenComponent<CascadeContextCapture>(0);
+                builder.AddAttribute(1, "OnContextCaptured", onCaptured);
+                builder.CloseComponent();
+            }));
+
+        // Assert
+        Assert.NotNull(capturedContext);
+        Assert.True(capturedContext!.IsDark);
+        Assert.Equal(SbDirection.Rtl, capturedContext.Direction);
+    }
+
+    /// <summary>
+    /// Helper component to capture cascaded theme context.
+    /// </summary>
+    private sealed class CascadeContextCapture : Microsoft.AspNetCore.Components.ComponentBase
+    {
+        [Microsoft.AspNetCore.Components.CascadingParameter]
+        public SbThemeContext? ThemeContext { get; set; }
+
+        [Microsoft.AspNetCore.Components.Parameter]
+        public Action<SbThemeContext>? OnContextCaptured { get; set; }
+
+        protected override void OnParametersSet()
+        {
+            if (ThemeContext != null)
+            {
+                OnContextCaptured?.Invoke(ThemeContext);
+            }
+        }
+    }
+}