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+using Microsoft.AspNetCore.Components;
+using Bunit;
+using SufiChain.SufiBlazor.Components.Layout;
+using Xunit;
+
+namespace SufiChain.SufiBlazor.Tests.Components.Layout;
+
+public class SbSpacerTests : BunitContext
+{
+    private IRenderedComponent<SbSpacer> RenderSpacer(
+        Action<ComponentParameterCollectionBuilder<SbSpacer>>? configure = null)
+    {
+        return Render<SbSpacer>(p => configure?.Invoke(p));
+    }
+
+    [Fact]
+    public void RendersSpacerStructure()
+    {
+        // Arrange & Act
+        var cut = RenderSpacer();
+
+        // Assert
+        var div = cut.Find(".sb-spacer");
+        Assert.NotNull(div);
+        Assert.Equal("div", div.TagName.ToLowerInvariant());
+        Assert.Equal("true", div.GetAttribute("aria-hidden"));
+    }
+
+    [Fact]
+    public void UsesMediumHeightByDefault()
+    {
+        // Arrange & Act
+        var cut = RenderSpacer();
+
+        // Assert - Medium = 1rem
+        var div = cut.Find(".sb-spacer");
+        var style = div.GetAttribute("style");
+        Assert.Contains("height: 1rem", style);
+    }
+
+    [Theory]
+    [InlineData(SbSpacerSize.ExtraSmall, "0.25rem")]
+    [InlineData(SbSpacerSize.Small, "0.5rem")]
+    [InlineData(SbSpacerSize.Medium, "1rem")]
+    [InlineData(SbSpacerSize.Large, "1.5rem")]
+    [InlineData(SbSpacerSize.ExtraLarge, "2rem")]
+    public void AppliesCorrectHeightForEachSize(SbSpacerSize size, string expectedHeight)
+    {
+        // Arrange & Act
+        var cut = RenderSpacer(p => p.Add(x => x.Size, size));
+
+        // Assert
+        var div = cut.Find(".sb-spacer");
+        var style = div.GetAttribute("style");
+        Assert.Contains($"height: {expectedHeight}", style);
+    }
+
+    [Fact]
+    public void HeightOverridesSize()
+    {
+        // Arrange & Act
+        var cut = RenderSpacer(p => p
+            .Add(x => x.Size, SbSpacerSize.Large)
+            .Add(x => x.Height, "3rem"));
+
+        // Assert - custom Height overrides Size
+        var div = cut.Find(".sb-spacer");
+        var style = div.GetAttribute("style");
+        Assert.Contains("height: 3rem", style);
+    }
+
+    [Fact]
+    public void AppliesWidthWhenProvided()
+    {
+        // Arrange & Act
+        var cut = RenderSpacer(p => p.Add(x => x.Width, "2rem"));
+
+        // Assert
+        var div = cut.Find(".sb-spacer");
+        var style = div.GetAttribute("style");
+        Assert.Contains("width: 2rem", style);
+    }
+
+    [Fact]
+    public void AppliesFlexGrowWhenGrowTrue()
+    {
+        // Arrange & Act
+        var cut = RenderSpacer(p => p.Add(x => x.Grow, true));
+
+        // Assert - Grow takes precedence, no height
+        var div = cut.Find(".sb-spacer");
+        var style = div.GetAttribute("style");
+        Assert.Contains("flex-grow: 1", style);
+        Assert.DoesNotContain("height:", style);
+    }
+
+    [Fact]
+    public void GrowWithWidthAppliesBoth()
+    {
+        // Arrange & Act
+        var cut = RenderSpacer(p => p
+            .Add(x => x.Grow, true)
+            .Add(x => x.Width, "1rem"));
+
+        // Assert
+        var div = cut.Find(".sb-spacer");
+        var style = div.GetAttribute("style");
+        Assert.Contains("flex-grow: 1", style);
+        Assert.Contains("width: 1rem", style);
+    }
+
+    [Fact]
+    public void AppliesClassParameter()
+    {
+        // Arrange & Act
+        var cut = RenderSpacer(p => p.Add(x => x.Class, "my-spacer"));
+
+        // Assert
+        var div = cut.Find(".sb-spacer");
+        Assert.Contains("my-spacer", div.ClassList);
+    }
+}