public void Should_Open_Writer_When_Mode_Is_Write()
{
//Arrange
_csvReader = Substitute.For <ICSVReader>();
_csvWriter = Substitute.For <ICSVWriter>();
_csvReaderWriter = new CSVReaderWriter(_csvReader, _csvWriter);
//Act
_csvReaderWriter.Open(FilePath, CSVReaderWriter.Mode.Write);
//Assert
_csvWriter.Received().Open(FilePath);
_csvReader.DidNotReceive().Open(FilePath);
}