added Test for EllipticalArcLineSegment

Author: derBobo

src/ImageSharp.Drawing/Shapes/EllipticalArcLineSegment.cs

@@ -29,9 +29,9 @@ public sealed class EllipticalArcLineSegment : ILineSegment
         /// <param name="center"> The center point of the ellipsis that the arc is a part of</param>
         /// <param name="firstRadius">First radius of the ellipsis</param>
         /// <param name="secondRadius">Second radius of the ellipsis</param>
-        /// <param name="rotation">The rotation of First radius to the X-Axis</param>
-        /// <param name="startAngle">The Start angle of the ellipsis</param>
-        /// <param name="sweepAngle"> The sweeping angle of the arc</param>
+        /// <param name="rotation">The rotation of First radius to the X-Axis in degree</param>
+        /// <param name="startAngle">The Start angle of the ellipsis in degree </param>
+        /// <param name="sweepAngle"> The sweeping angle of the arc in degree</param>
         /// <param name="transformation">The TRanformation matrix, that should be used on the arc</param>
         public EllipticalArcLineSegment(PointF center, float firstRadius, float secondRadius, float rotation, float startAngle, float sweepAngle, Matrix3x2 transformation)
         {

tests/ImageSharp.Drawing.Tests/Shapes/EllipticalArcLineSegmentTest.cs

@@ -0,0 +1,26 @@
+// Copyright (c) Six Labors.
+// Licensed under the Apache License, Version 2.0.
+
+using System;
+using System.Collections.Generic;
+using System.Numerics;
+using System.Text;
+using Xunit;
+
+namespace SixLabors.ImageSharp.Drawing.Tests
+{
+    public class EllipticalArcLineSegmentTest
+    {
+        [Fact]
+        public void ContainsStartandEnd()
+        {
+            var segment = new EllipticalArcLineSegment(new PointF(10, 10), 10, 20, 0, 0, 90, Matrix3x2.Identity);
+            IReadOnlyList<PointF> points = segment.Flatten().ToArray();
+            Assert.Equal((double)points[0].X, 10, 5);
+            Assert.Equal((double)points[0].Y, 30, 5);
+            Assert.Equal((double)segment.EndPoint.X, 20, 5);
+            Assert.Equal((double)segment.EndPoint.Y, 10, 5);
+
+        }
+    }
+}