🚨Added GetImage test in GraphicTest

Author: Szymekk44

Tests/Kernels/GraphicTest/Kernel.cs

@@ -102,6 +102,9 @@ private void DoTest(Canvas aCanvas)
             aCanvas.DrawImage(bitmap, 10, 10);
             aCanvas.DrawImage(letter, 50, 10);
 
+            Bitmap GetImageTest = aCanvas.GetImage(50, 10, (int)letter.Width, (int)letter.Height);
+            Assert.AreEqual(GetImageTest.RawData, letter.RawData, "GetImage returns correct values");
+
             /* Drawing BitmapHeaderV5 image */
             Bitmap v5header = new Bitmap(Convert.FromBase64String(parrot));
             aCanvas.DrawImage(v5header,0,0);