poi/src/testcases/org/apache/poi/ss/usermodel/BaseTestDataFormat.java

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

import junit.framework.TestCase;

import org.apache.poi.ss.ITestDataProvider;
import org.apache.poi.xssf.XSSFTestDataSamples;
import org.apache.poi.xssf.usermodel.XSSFCell;
import org.apache.poi.xssf.usermodel.XSSFCellStyle;
import org.apache.poi.xssf.usermodel.XSSFDataFormat;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

/**
 * Tests of implementation of {@link DataFormat}
 *
 */
public abstract class BaseTestDataFormat extends TestCase {

    private final ITestDataProvider _testDataProvider;

    protected BaseTestDataFormat(ITestDataProvider testDataProvider) {
        _testDataProvider = testDataProvider;
    }

    public final void testBuiltinFormats() {
        Workbook wb = _testDataProvider.createWorkbook();

        DataFormat df = wb.createDataFormat();

        String[] formats = BuiltinFormats.getAll();
        for (int idx = 0; idx < formats.length; idx++) {
            String fmt = formats[idx];
            assertEquals(idx, df.getFormat(fmt));
        }

        //default format for new cells is General
        Sheet sheet = wb.createSheet();
        Cell cell = sheet.createRow(0).createCell(0);
        assertEquals(0, cell.getCellStyle().getDataFormat());
        assertEquals("General", cell.getCellStyle().getDataFormatString());

        //create a custom data format
        String customFmt = "#0.00 AM/PM";
        //check it is not in built-in formats
        assertEquals(-1, BuiltinFormats.getBuiltinFormat(customFmt));
        int customIdx = df.getFormat(customFmt);
        //The first user-defined format starts at 164.
        assertTrue(customIdx >= BuiltinFormats.FIRST_USER_DEFINED_FORMAT_INDEX);
        //read and verify the string representation
        assertEquals(customFmt, df.getFormat((short)customIdx));
    }
    
    /**
     * [Bug 49928] formatCellValue returns incorrect value for \u00a3 formatted cells
     */
    public abstract void test49928();
    protected final String poundFmt = "\"\u00a3\"#,##0;[Red]\\-\"\u00a3\"#,##0";
    public void doTest49928Core(Workbook wb){
        DataFormatter df = new DataFormatter();

        Sheet sheet = wb.getSheetAt(0);
        Cell cell = sheet.getRow(0).getCell(0);
        CellStyle style = cell.getCellStyle();

        String poundFmt = "\"\u00a3\"#,##0;[Red]\\-\"\u00a3\"#,##0";
        // not expected normally, id of a custom format should be greater 
        // than BuiltinFormats.FIRST_USER_DEFINED_FORMAT_INDEX
        short  poundFmtIdx = 6;

        assertEquals(poundFmt, style.getDataFormatString());
        assertEquals(poundFmtIdx, style.getDataFormat());
        assertEquals("\u00a31", df.formatCellValue(cell));


        DataFormat dataFormat = wb.createDataFormat();
        assertEquals(poundFmtIdx, dataFormat.getFormat(poundFmt));
        assertEquals(poundFmt, dataFormat.getFormat(poundFmtIdx));
    }
}