src/testcases/org/apache/poi/hssf/usermodel/TestHSSFComment.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.junit.Assert.assertEquals;

import org.apache.poi.hssf.HSSFITestDataProvider;
import org.apache.poi.hssf.HSSFTestDataSamples;
import org.apache.poi.ss.usermodel.BaseTestCellComment;
import org.junit.Test;

/**
 * Tests TestHSSFCellComment.
 *
 * @author  Yegor Kozlov
 */
public final class TestHSSFComment extends BaseTestCellComment {

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

    @Test
    public void defaultShapeType() {
        HSSFComment comment = new HSSFComment((HSSFShape)null, new HSSFClientAnchor());
        assertEquals(HSSFSimpleShape.OBJECT_TYPE_COMMENT, comment.getShapeType());
    }

    /**
     *  HSSFCell#findCellComment should NOT rely on the order of records
     * when matching cells and their cell comments. The correct algorithm is to map
     */
    @Test
    public void bug47924() {
        HSSFWorkbook wb = HSSFTestDataSamples.openSampleWorkbook("47924.xls");
        HSSFSheet sheet = wb.getSheetAt(0);
        HSSFCell cell;
        HSSFComment comment;

        cell = sheet.getRow(0).getCell(0);
        comment = cell.getCellComment();
        assertEquals("a1", comment.getString().getString());

        cell = sheet.getRow(1).getCell(0);
        comment = cell.getCellComment();
        assertEquals("a2", comment.getString().getString());

        cell = sheet.getRow(2).getCell(0);
        comment = cell.getCellComment();
        assertEquals("a3", comment.getString().getString());

        cell = sheet.getRow(2).getCell(2);
        comment = cell.getCellComment();
        assertEquals("c3", comment.getString().getString());

        cell = sheet.getRow(4).getCell(1);
        comment = cell.getCellComment();
        assertEquals("b5", comment.getString().getString());

        cell = sheet.getRow(5).getCell(2);
        comment = cell.getCellComment();
        assertEquals("c6", comment.getString().getString());
    }
}