src/ooxml/testcases/org/apache/poi/ss/usermodel/BaseTestXCell.java

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   this work for additional information regarding copyright ownership.
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package org.apache.poi.ss.usermodel;

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.ss.ITestDataProvider;
import org.apache.poi.ss.SpreadsheetVersion;
import org.apache.poi.xssf.SXSSFITestDataProvider;
import org.apache.poi.xssf.XSSFITestDataProvider;
import org.apache.poi.xssf.streaming.SXSSFCell;
import org.apache.poi.xssf.usermodel.XSSFCell;

/**
 * Class for combined testing of XML-specific functionality of 
 * {@link XSSFCell} and {@link SXSSFCell}.
 * 
 *  Any test that is applicable for {@link HSSFCell} as well should go into
 *  the common base class {@link BaseTestCell}.
 */
public abstract class BaseTestXCell extends BaseTestCell {
    protected BaseTestXCell(ITestDataProvider testDataProvider) {
        super(testDataProvider);
    }

    public void testXmlEncoding(){
        Workbook wb = _testDataProvider.createWorkbook();
        Sheet sh = wb.createSheet();
        Row row = sh.createRow(0);
        Cell cell = row.createCell(0);
        String sval = "\u0000\u0002\u0012<>\t\n\u00a0 &\"POI\'\u2122";
        cell.setCellValue(sval);

        wb = _testDataProvider.writeOutAndReadBack(wb);

        // invalid characters are replaced with question marks
        assertEquals("???<>\t\n\u00a0 &\"POI\'\u2122", wb.getSheetAt(0).getRow(0).getCell(0).getStringCellValue());
    }
}