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 java.util.Map;

import junit.framework.TestCase;
import org.apache.poi.ss.ITestDataProvider;

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

    /**
     * @return an object that provides test data in HSSF / XSSF specific way
     */
    protected abstract ITestDataProvider getTestDataProvider();

    public void baseBuiltinFormats() throws Exception {
        Workbook wb = getTestDataProvider().createWorkbook();

        DataFormat df = wb.createDataFormat();

        Map<Integer, String> formats = BuiltinFormats.getBuiltinFormats();
        for (int idx : formats.keySet()) {
            String fmt = formats.get(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));
    }
}