src/testcases/org/apache/poi/hssf/usermodel/TestHSSFDataFormat.java

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

import static org.apache.poi.hssf.HSSFTestDataSamples.openSampleWorkbook;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertNotNull;

import java.io.IOException;
import java.util.Arrays;
import java.util.List;

import org.apache.poi.hssf.HSSFITestDataProvider;
import org.apache.poi.ss.usermodel.BaseTestDataFormat;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.junit.jupiter.api.Test;

/**
 * Tests for {@link HSSFDataFormat}
 */
final class TestHSSFDataFormat extends BaseTestDataFormat {

    public TestHSSFDataFormat() {
        super(HSSFITestDataProvider.instance);
    }

    /**
     * Bug 51378: getDataFormatString method call crashes when reading the test file
     */
    @Test
    void test51378() throws IOException {
        List<String> expNull = Arrays.asList( "0-3-0","0-43-11" );
        try (HSSFWorkbook wb = openSampleWorkbook("12561-1.xls")) {
            for (Sheet sheet : wb) {
                for (Row row : sheet) {
                    for (Cell cell : row) {
                        CellStyle style = cell.getCellStyle();
                        assertNotNull(style);
                        String coord = wb.getSheetIndex(sheet)+"-"+cell.getRowIndex()+"-"+cell.getColumnIndex();
                        String fmt = style.getDataFormatString();
                        assertEquals(expNull.contains(coord), fmt == null, coord+" unexpected");
                    }
                }
            }
        }
    }

}