public void Should_Return_Null_For_Invalid_Urls_Or_Without_Csv_Extension()
{
ICsvParserService csvParserService = Substitute.For <ICsvParserService>();
ILogger <CsvParserLogic> logger = Substitute.For <ILogger <CsvParserLogic> >();
ICsvParserLogic csvParserLogic = new CsvParserLogic(csvParserService, logger);
IEnumerable <string> invalidUrls;
using (Stream stream = new MemoryStream())
{
csvParserService.ParseCsvAsync(Arg.Any <string>(), Arg.Any <OutputFormats>()).Returns(Task.FromResult(stream));
invalidUrls = GetInvalidUrls();
foreach (string url in invalidUrls)
{
Stream result = csvParserLogic.ParseCsvAsync(url, OutputFormats.json).Result;
Assert.Null(result);
}
IEnumerable <string> validUrls = GetValidUrls();
foreach (string url in validUrls)
{
Stream result = csvParserLogic.ParseCsvAsync(url, OutputFormats.json).Result;
Assert.NotNull(result);
}
}
}
public async Task <Stream> ParseCsvAsync(string csvUri, OutputFormats ouputFormat)
{
try
{
if (!Uri.IsWellFormedUriString(csvUri, UriKind.Absolute))
{
Console.WriteLine("The Uri is not Well Formatted");
return(null);
}
bool isUriCreated = Uri.TryCreate(csvUri, UriKind.Absolute, out Uri uri);
if (isUriCreated == false || uri == null)
{
Console.WriteLine("Invalid Uri");
return(null);
}
if (Path.GetExtension(csvUri) != ".csv")
{
Console.WriteLine("Invalid Csv file");
return(null);
}
return(await CsvParserService.ParseCsvAsync(csvUri, ouputFormat));
}
catch (Exception e)
{
Logger.LogError($"Error: {e.Message}");
return(null);
}
}