Add geometry struct unit tests

tests/ShimSkiaSharp.UnitTests/SKPoint3Tests.cs

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+using Xunit;
+using ShimSkiaSharp;
+
+namespace ShimSkiaSharp.UnitTests;
+
+public class SKPoint3Tests
+{
+    [Fact]
+    public void Empty_IsEmpty()
+    {
+        Assert.True(SKPoint3.Empty.IsEmpty);
+    }
+
+    [Fact]
+    public void Constructor_SetsProperties()
+    {
+        var p = new SKPoint3(1f, 2f, 3f);
+        Assert.Equal(1f, p.X);
+        Assert.Equal(2f, p.Y);
+        Assert.Equal(3f, p.Z);
+        Assert.False(p.IsEmpty);
+    }
+
+    [Fact]
+    public void ToString_ReturnsValues()
+    {
+        var p = new SKPoint3(4f, 5f, 6f);
+        Assert.Equal("4, 5, 6", p.ToString());
+    }
+}

tests/ShimSkiaSharp.UnitTests/SKPointITests.cs

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+using Xunit;
+using ShimSkiaSharp;
+
+namespace ShimSkiaSharp.UnitTests;
+
+public class SKPointITests
+{
+    [Fact]
+    public void Empty_IsEmpty()
+    {
+        Assert.True(SKPointI.Empty.IsEmpty);
+    }
+
+    [Fact]
+    public void Constructor_SetsProperties()
+    {
+        var p = new SKPointI(7, 8);
+        Assert.Equal(7, p.X);
+        Assert.Equal(8, p.Y);
+        Assert.False(p.IsEmpty);
+    }
+
+    [Fact]
+    public void ToString_ReturnsValues()
+    {
+        var p = new SKPointI(1, 2);
+        Assert.Equal("1, 2", p.ToString());
+    }
+}

tests/ShimSkiaSharp.UnitTests/SKPointTests.cs

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+using Xunit;
+using ShimSkiaSharp;
+
+namespace ShimSkiaSharp.UnitTests;
+
+public class SKPointTests
+{
+    [Fact]
+    public void Empty_IsEmpty()
+    {
+        Assert.True(SKPoint.Empty.IsEmpty);
+    }
+
+    [Fact]
+    public void Constructor_SetsProperties()
+    {
+        var p = new SKPoint(3.5f, 4.5f);
+        Assert.Equal(3.5f, p.X);
+        Assert.Equal(4.5f, p.Y);
+        Assert.False(p.IsEmpty);
+    }
+
+    [Fact]
+    public void ToString_ReturnsValues()
+    {
+        var p = new SKPoint(1f, 2f);
+        Assert.Equal("1, 2", p.ToString());
+    }
+}

tests/ShimSkiaSharp.UnitTests/SKSizeITests.cs

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+using Xunit;
+using ShimSkiaSharp;
+
+namespace ShimSkiaSharp.UnitTests;
+
+public class SKSizeITests
+{
+    [Fact]
+    public void Empty_IsEmpty()
+    {
+        Assert.True(SKSizeI.Empty.IsEmpty);
+    }
+
+    [Fact]
+    public void Constructor_SetsProperties()
+    {
+        var s = new SKSizeI(9, 10);
+        Assert.Equal(9, s.Width);
+        Assert.Equal(10, s.Height);
+        Assert.False(s.IsEmpty);
+    }
+
+    [Fact]
+    public void ToString_ReturnsValues()
+    {
+        var s = new SKSizeI(3, 4);
+        Assert.Equal("3, 4", s.ToString());
+    }
+}

tests/ShimSkiaSharp.UnitTests/SKSizeTests.cs

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+using Xunit;
+using ShimSkiaSharp;
+
+namespace ShimSkiaSharp.UnitTests;
+
+public class SKSizeTests
+{
+    [Fact]
+    public void Empty_IsEmpty()
+    {
+        Assert.True(SKSize.Empty.IsEmpty);
+    }
+
+    [Fact]
+    public void Constructor_SetsProperties()
+    {
+        var s = new SKSize(5.5f, 6.5f);
+        Assert.Equal(5.5f, s.Width);
+        Assert.Equal(6.5f, s.Height);
+        Assert.False(s.IsEmpty);
+    }
+
+    [Fact]
+    public void ToString_ReturnsValues()
+    {
+        var s = new SKSize(2f, 3f);
+        Assert.Equal("2, 3", s.ToString());
+    }
+}