public virtual void TestPreprocessingConditions() { Pix pix = null; NUnit.Framework.Assert.IsNull(TesseractOcrUtil.ConvertToGrayscale(pix)); NUnit.Framework.Assert.IsNull(TesseractOcrUtil.OtsuImageThresholding(pix)); NUnit.Framework.Assert.IsNull(TesseractOcrUtil.ConvertPixToImage(pix)); TesseractOcrUtil.DestroyPix(pix); }