public CSVReaderWriter()
{
// This needs to be injected by IoC container but as I didn't wanted to change the signature of the caller class, I didn't pass it through constructor
var fileProvider = new FileProvider();
_builder = new CsvReaderWriterBuilder(fileProvider);
}
// It's anti-pattern to have two constructors (one with injection and one without) but this is done for the purpose of the mocking for the tests.
public CSVReaderWriter(ICsvReaderWriterBuilder builder)
{
_builder = builder ?? throw new ArgumentNullException(nameof(builder));
}
