public void ConvertFromExcelTest() { var converter = new StringConverter(); var typeConverterOptions = new TypeConverterOptions { CultureInfo = CultureInfo.CurrentCulture, }; Assert.AreEqual("12.3", converter.ConvertFromExcel(typeConverterOptions, 12.3)); Assert.AreEqual("123", converter.ConvertFromExcel(typeConverterOptions, "123")); Assert.AreEqual("123", converter.ConvertFromExcel(typeConverterOptions, " 123 ")); Assert.AreEqual("", converter.ConvertFromExcel(typeConverterOptions, null)); }