poi-ooxml/src/test/java/org/apache/poi/xwpf/TestPackageCorePropertiesGetKeywords.java

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

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

import java.io.IOException;

import org.apache.poi.ooxml.POIXMLProperties.CoreProperties;
import org.apache.poi.openxml4j.opc.PackageProperties;
import org.apache.poi.xwpf.usermodel.XWPFDocument;
import org.junit.jupiter.api.Test;

/**
 * Tests if the {@link CoreProperties#getKeywords()} method. This test has been
 * submitted because even though the
 * {@link PackageProperties#getKeywordsProperty()} had been present before, the
 * {@link CoreProperties#getKeywords()} had been missing.
 * <p>
 * The author of this has added {@link CoreProperties#getKeywords()} and
 * {@link CoreProperties#setKeywords(String)} and this test is supposed to test
 * them.
 */
public final class TestPackageCorePropertiesGetKeywords {
    @Test
    void testGetSetKeywords() throws IOException {
        try (XWPFDocument doc = XWPFTestDataSamples.openSampleDocument("TestPoiXMLDocumentCorePropertiesGetKeywords.docx")) {
            String keywords = doc.getProperties().getCoreProperties().getKeywords();
            assertEquals("extractor, test, rdf", keywords);

            doc.getProperties().getCoreProperties().setKeywords("test, keywords");
            XWPFDocument docBack = XWPFTestDataSamples.writeOutAndReadBack(doc);
            keywords = docBack.getProperties().getCoreProperties().getKeywords();
            assertEquals("test, keywords", keywords);
        }
    }
}