TestXSSFChartSheet.java

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

import org.apache.poi.ss.util.CellAddress;
import org.apache.poi.xssf.XSSFTestDataSamples;
import org.junit.jupiter.api.Test;
import org.openxmlformats.schemas.spreadsheetml.x2006.main.CTChartsheet;

import java.io.IOException;

import static org.junit.jupiter.api.Assertions.*;

public final class TestXSSFChartSheet {

    @Test
    void testXSSFFactory() throws IOException {
        try (XSSFWorkbook wb = XSSFTestDataSamples.openSampleWorkbook("chart_sheet.xlsx")) {
            assertEquals(4, wb.getNumberOfSheets());

            //the third sheet is of type 'chartsheet'
            assertEquals("Chart1", wb.getSheetName(2));
            assertTrue(wb.getSheetAt(2) instanceof XSSFChartSheet);
            assertEquals("Chart1", wb.getSheetAt(2).getSheetName());

            final CTChartsheet ctChartsheet = ((XSSFChartSheet) wb.getSheetAt(2)).getCTChartsheet();
            assertNotNull(ctChartsheet);
        }
    }

    @Test
    void testGetAccessors() throws IOException {
        try (XSSFWorkbook wb = XSSFTestDataSamples.openSampleWorkbook("chart_sheet.xlsx")) {
            XSSFChartSheet sheet = (XSSFChartSheet) wb.getSheetAt(2);

            assertFalse(sheet.iterator().hasNext(), "Row iterator for charts sheets should return zero rows");

            //access to an arbitrary row
            assertNull(sheet.getRow(1));

            //some basic get* accessors
            assertEquals(0, sheet.getNumberOfComments());
            assertEquals(0, sheet.getNumHyperlinks());
            assertEquals(0, sheet.getNumMergedRegions());
            assertNull(sheet.getActiveCell());
            assertTrue(sheet.getAutobreaks());
            assertNull(sheet.getCellComment(new CellAddress(0, 0)));
            assertEquals(0, sheet.getColumnBreaks().length);
            assertTrue(sheet.getRowSumsBelow());
            assertNotNull(sheet.createDrawingPatriarch());
            assertNotNull(sheet.getDrawingPatriarch());
            assertNotNull(sheet.getCTChartsheet());
        }
    }

    @Test
    void testGetCharts() throws Exception {
       try (XSSFWorkbook wb = XSSFTestDataSamples.openSampleWorkbook("chart_sheet.xlsx")) {

           XSSFSheet ns = wb.getSheetAt(0);
           XSSFChartSheet cs = (XSSFChartSheet) wb.getSheetAt(2);

           assertEquals(0, ns.createDrawingPatriarch().getCharts().size());
           assertEquals(1, cs.createDrawingPatriarch().getCharts().size());

           XSSFChart chart = cs.createDrawingPatriarch().getCharts().get(0);
           assertNull(chart.getTitleText());
       }
    }
}