public void IsExcelFileExtension_NonExcelExtension_ReturnsFalse()
{
string filename = "file.txt";
const bool expected = false;
bool result = ExcelFileType.IsExcelFileExtension(filename);
result.Should().Be(expected);
}
public void IsExcelFileExtension_xlsExtensionLowercase_ReturnsTrue()
{
string filename = "file.xls";
const bool expected = true;
bool result = ExcelFileType.IsExcelFileExtension(filename);
result.Should().Be(expected);
}
public void IsExcelFileExtension_EmptyString_ReturnsFalse()
{
string filename = string.Empty;
const bool expected = false;
bool result = ExcelFileType.IsExcelFileExtension(filename);
result.Should().Be(expected);
}