public void Should_set_workbook_from_stream()
        {
            using (FileStream stream = new FileStream(testFileXlsx, FileMode.Open, FileAccess.Read))
            {
                var importer = new ExcelXlsxImporter();
                importer.Open(stream);

                Assert.IsNotNull(importer.Workbook);
            }
        }
        public void Should_set_workbook_from_stream()
        {
            using (FileStream stream = new FileStream(testFileXlsx, FileMode.Open, FileAccess.Read))
            {
                var importer = new ExcelXlsxImporter();
                importer.Open(stream);

                Assert.IsNotNull(importer.Workbook);
            }
        }
        public void Should_throw_exception_if_file_stream_null()
        {
            var importer = new ExcelXlsxImporter();

            Assert.Throws<ArgumentNullException>(() => importer.Open(null));
        }
        public void Should_throw_exception_if_file_stream_null()
        {
            var importer = new ExcelXlsxImporter();

            Assert.Throws <ArgumentNullException>(() => importer.Open(null));
        }