public virtual void TestDefaultTessDataPathValidationForLib() { NUnit.Framework.Assert.That(() => { String path = TEST_IMAGES_DIRECTORY + "numbers_01.jpg"; FileInfo imgFile = new FileInfo(path); Tesseract4LibOcrEngine engine = new Tesseract4LibOcrEngine(new Tesseract4OcrEngineProperties()); engine.DoImageOcr(imgFile); } , NUnit.Framework.Throws.InstanceOf <Tesseract4OcrException>().With.Message.EqualTo(Tesseract4OcrException.PATH_TO_TESS_DATA_IS_NOT_SET)) ; }