package integrationTest.writeThenRead;
   
   import com.opencsv.CSVReader;
   import com.opencsv.CSVReaderBuilder;
   import com.opencsv.CSVWriterBuilder;
   import com.opencsv.ICSVWriter;
   import com.opencsv.exceptions.CsvException;
   import org.junit.jupiter.api.DisplayName;
   import org.junit.jupiter.params.ParameterizedTest;
  import org.junit.jupiter.params.provider.Arguments;
  import org.junit.jupiter.params.provider.MethodSource;
  
  import java.io.*;
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.List;
  import java.util.stream.Stream;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  
  /**
   * The purpose of these tests is to write an array of data using the CSVWriter then read
   * it with the CSVReader to ensure the result is the original data.
   */
  public class WriteThenReadTest {
  
      private static Stream<Arguments> singleArrayItem() {
          return Stream.of(
                  Arguments.of("1", "\\Escape at beginning."),
                  Arguments.of("2", "Escape in\\ middle."),
                  Arguments.of("3", "Escape at end.\\")
          );
      }
  
      @DisplayName("To have the CSVWriter and CSVReader work together they must have the same escape character.")
      @ParameterizedTest
      @MethodSource("singleArrayItem")
      public void defaultWriterAndReader(String id, String description) throws IOException, CsvException {
          String[] originalArray = {id, description};
  
          Writer writer = new StringWriter();
          CSVWriterBuilder writerBuilder = new CSVWriterBuilder(writer);
          ICSVWriter icsvWriter = writerBuilder.withEscapeChar('\\').build();
  
          List<String[]> rows = new ArrayList<>();
          rows.add(originalArray);
  
          System.out.println(listToString(rows));
          icsvWriter.writeAll(rows);
          System.out.println(writer);
  
          Reader reader = new StringReader(writer.toString());
          CSVReaderBuilder readerBuilder = new CSVReaderBuilder(reader);
          CSVReader csvReader = readerBuilder.build();
  
          List<String[]> readRows = csvReader.readAll();
          String originalString = listToString(rows);
          String readString = listToString(readRows);
          assertEquals(originalString, readString, String.format("Expected: %s     | Actual: %s    |", originalString, readString));
      }
  
      private String listToString(List<String[]> rows) {
          StringBuilder builder = new StringBuilder(1024);
          rows.forEach(a -> {
              builder.append(Arrays.toString(a));
              builder.append("\n");
          });
          return builder.toString();
      }
  }