src/ooxml/testcases/org/apache/poi/xwpf/usermodel/TestXWPFFootnotes.java

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   this work for additional information regarding copyright ownership.
   The ASF licenses this file to You under the Apache License, Version 2.0
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package org.apache.poi.xwpf.usermodel;

import java.io.IOException;
import java.math.BigInteger;
import java.util.List;

import org.apache.poi.xwpf.XWPFTestDataSamples;
import org.junit.jupiter.api.Test;
import org.openxmlformats.schemas.wordprocessingml.x2006.main.STFtnEdn;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertNotNull;
import static org.junit.jupiter.api.Assertions.assertSame;

class TestXWPFFootnotes {
    @Test
    void testCreateFootnotes() throws IOException{
        try (XWPFDocument docOut = new XWPFDocument()) {

            XWPFAbstractFootnotesEndnotes footnotes = docOut.createFootnotes();

            assertNotNull(footnotes);

            XWPFAbstractFootnotesEndnotes secondFootnotes = docOut.createFootnotes();

            assertSame(footnotes, secondFootnotes);
        }
    }

    @Test
    void testAddFootnotesToDocument() throws IOException {
        try (XWPFDocument docOut = new XWPFDocument()) {

            // NOTE: XWPFDocument.createFootnote() delegates directly
            //       to XWPFFootnotes.createFootnote() so this tests
            //       both creation of new XWPFFootnotes in document
            //       and XWPFFootnotes.createFootnote();
            XWPFFootnote footnote = docOut.createFootnote();
            BigInteger noteId = footnote.getId();

            XWPFDocument docIn = XWPFTestDataSamples.writeOutAndReadBack(docOut);

            XWPFFootnote note = docIn.getFootnoteByID(noteId.intValue());
            assertNotNull(note);
            assertEquals(STFtnEdn.NORMAL, note.getCTFtnEdn().getType());
        }
    }

    /**
     * Bug 55066 - avoid double loading the footnotes
     */
    @Test
    void testLoadFootnotesOnce() throws IOException {
        try (XWPFDocument doc = XWPFTestDataSamples.openSampleDocument("Bug54849.docx")) {
            List<XWPFFootnote> footnotes = doc.getFootnotes();
            int hits = 0;
            for (XWPFFootnote fn : footnotes) {
                for (IBodyElement e : fn.getBodyElements()) {
                    if (e instanceof XWPFParagraph) {
                        String txt = ((XWPFParagraph) e).getText();
                        if (txt.contains("Footnote_sdt")) {
                            hits++;
                        }
                    }
                }
            }
            assertEquals(1, hits, "Load footnotes once");
        }
    }
}