poi-ooxml/src/test/java/org/apache/poi/xssf/usermodel/TestXSSFUnicodeSurrogates.java

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   this work for additional information regarding copyright ownership.
   The ASF licenses this file to You under the Apache License, Version 2.0
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package org.apache.poi.xssf.usermodel;

import static org.junit.jupiter.api.Assertions.assertEquals;

import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.util.TempFile;
import org.junit.jupiter.api.Test;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

class TestXSSFUnicodeSurrogates {

    // "𝝊𝝋𝝌𝝍𝝎𝝏𝝐𝝑𝝒𝝓𝝔𝝕𝝖𝝗𝝘𝝙𝝚𝝛𝝜𝝝𝝞𝝟𝝠𝝡𝝢𝝣𝝤𝝥𝝦𝝧𝝨𝝩𝝪𝝫𝝬𝝭𝝮𝝯𝝰𝝱𝝲𝝳𝝴𝝵𝝶𝝷𝝸𝝹𝝺";
    private static final String unicodeText =
        "\uD835\uDF4A\uD835\uDF4B\uD835\uDF4C\uD835\uDF4D\uD835\uDF4E\uD835\uDF4F\uD835\uDF50\uD835" +
        "\uDF51\uD835\uDF52\uD835\uDF53\uD835\uDF54\uD835\uDF55\uD835\uDF56\uD835\uDF57\uD835\uDF58" +
        "\uD835\uDF59\uD835\uDF5A\uD835\uDF5B\uD835\uDF5C\uD835\uDF5D\uD835\uDF5E\uD835\uDF5F\uD835" +
        "\uDF60\uD835\uDF61\uD835\uDF62\uD835\uDF63\uD835\uDF64\uD835\uDF65\uD835\uDF66\uD835\uDF67" +
        "\uD835\uDF68\uD835\uDF69\uD835\uDF6A\uD835\uDF6B\uD835\uDF6C\uD835\uDF6D\uD835\uDF6E\uD835" +
        "\uDF6F\uD835\uDF70\uD835\uDF71\uD835\uDF72\uD835\uDF73\uD835\uDF74\uD835\uDF75\uD835\uDF76" +
        "\uD835\uDF77\uD835\uDF78\uD835\uDF79\uD835\uDF7A";

    @Test
    void testWriteUnicodeSurrogates() throws IOException {
        String sheetName = "Sheet1";
        File tf = TempFile.createTempFile("poi-xmlbeans-test", ".xlsx");
        try (XSSFWorkbook wb = new XSSFWorkbook()) {
            Sheet sheet = wb.createSheet(sheetName);
            Row row = sheet.createRow(0);
            Cell cell = row.createCell(0);
            cell.setCellValue(unicodeText);
            try (FileOutputStream os = new FileOutputStream(tf)) {
                wb.write(os);
            }
            try (FileInputStream fis = new FileInputStream(tf);
                 XSSFWorkbook wb2 = new XSSFWorkbook(fis)) {
                Sheet sheet2 = wb2.getSheet(sheetName);
                Cell cell2 = sheet2.getRow(0).getCell(0);
                assertEquals(unicodeText, cell2.getStringCellValue());
            }
        } finally {
            tf.delete();
        }
    }
}