add test

hutool-core/src/test/java/cn/hutool/core/text/csv/Issue3705Test.java

@@ -0,0 +1,26 @@
+package cn.hutool.core.text.csv;
+
+import cn.hutool.core.io.FileUtil;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+import java.io.StringWriter;
+
+public class Issue3705Test {
+	@Test
+	void writeTest() {
+		final StringWriter stringWriter = new StringWriter();
+
+		CsvWriteConfig csvWriteConfig = new CsvWriteConfig();
+		try (CsvWriter csvWriter = new CsvWriter(stringWriter, csvWriteConfig)) {
+			// 由于一行的第一个字段中有逗号，因此需要使用双引号包围，否则会被当成分隔符
+			csvWriter.writeLine("2024-08-20 14:24:35,");
+			csvWriter.writeLine("最后一行");
+			csvWriter.flush();
+		}
+
+		Assertions.assertEquals(
+			"\"2024-08-20 14:24:35,\"" + FileUtil.getLineSeparator() + "最后一行",
+			stringWriter.toString());
+	}
+}