enhance unit test for CsvOptions to cover new detectDelimiterMethod

contribs/application/src/test/java/org/matsim/application/options/CsvOptionsTest.java

@@ -3,11 +3,13 @@
 import org.apache.commons.csv.CSVFormat;
 import org.apache.commons.csv.CSVPrinter;
 import org.junit.jupiter.api.Test;
-import org.junit.jupiter.api.extension.RegisterExtension;
 import org.junit.jupiter.api.io.TempDir;
 
 import java.io.IOException;
+import java.nio.charset.StandardCharsets;
 import java.nio.file.Path;
+import java.util.ArrayList;
+import java.util.List;
 
 import static org.assertj.core.api.Assertions.assertThat;
 
@@ -20,18 +22,27 @@ public class CsvOptionsTest {
 	@Test
 	void output() throws IOException {
 
-		CsvOptions csv = new CsvOptions(CSVFormat.Predefined.TDF);
+		List<CsvOptions> delimiters = new ArrayList<>();
 
-		Path tmp = f.resolve("test.csv");
+		delimiters.add(new CsvOptions(CSVFormat.Predefined.TDF));
+		delimiters.add(new CsvOptions(CSVFormat.Predefined.Default));
+		delimiters.add(new CsvOptions(CSVFormat.Predefined.Default, ';', StandardCharsets.UTF_8));
 
-		CSVPrinter printer = csv.createPrinter(tmp);
+		for (CsvOptions csv : delimiters) {
+			Path tmp = f.resolve("test.csv");
 
-		printer.printRecord("header", "column");
-		printer.printRecord("1", "2");
-		printer.close();
+			CSVPrinter printer = csv.createPrinter(tmp);
 
-		assertThat(tmp)
-				.hasContent("header\tcolumn\n1\t2");
+			String delimiter = csv.getFormat().getDelimiterString();
 
+			printer.printRecord("header", "column");
+			printer.printRecord("1", "2");
+			printer.close();
+
+			assertThat(tmp)
+				.hasContent("header" + delimiter + "column\n1" + delimiter + "2");
+
+			assertThat(delimiter).isEqualTo(csv.detectDelimiter(tmp.toString()).toString());
+		}
 	}
 }