Fix unit tests.

Emgu.CV.Test/AutoTestImage.cs

@@ -646,11 +646,14 @@ namespace Emgu.CV.Test
             Image<Gray, Single> img4 = new Image<Gray, float>("stuff.jpg");
             Image<Bgr, Single> img5 = new Image<Bgr, float>("stuff.jpg");
 
-            Bitmap bmp = new Bitmap("stuff.jpg");
-            Image<Bgr, Single> img6 = bmp.ToImage<Bgr, float>();
+            if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
+            {
+                Bitmap bmp = new Bitmap("stuff.jpg");
+                Image<Bgr, Single> img6 = bmp.ToImage<Bgr, float>();
 
-            Image<Hsv, Single> img7 = new Image<Hsv, float>("stuff.jpg");
-            Image<Hsv, Byte> img8 = new Image<Hsv, byte>("stuff.jpg");
+                Image<Hsv, Single> img7 = new Image<Hsv, float>("stuff.jpg");
+                Image<Hsv, Byte> img8 = new Image<Hsv, byte>("stuff.jpg");
+            }
 
         }
 #endif

Emgu.CV.Test/AutoTestOcr.cs

@@ -120,6 +120,7 @@ namespace Emgu.CV.Test
             using (Tesseract ocr = await GetTesseract())
             using (Mat img = new Mat(new Size(1024, 960), DepthType.Cv8U, 3))
             {
+                img.SetTo(new MCvScalar()); //Set to a black image
                 ocr.SetImage(img);
                 bool success = ocr.Recognize() == 0;
                 if (success)