src/testcases/org/apache/poi/hssf/usermodel/TestEmbeddedObjects.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.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertNotNull;

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

import org.apache.poi.hssf.HSSFTestDataSamples;
import org.junit.jupiter.api.Test;

/**
 * Tests for the embedded object fetching support in HSSF
 */
class TestEmbeddedObjects {
    @Test
    void testReadExistingObject() throws IOException {
        try (HSSFWorkbook wb = HSSFTestDataSamples.openSampleWorkbook("drawings.xls")) {
            List<HSSFObjectData> list = wb.getAllEmbeddedObjects();
            assertEquals(list.size(), 1);
            HSSFObjectData obj = list.get(0);
            assertNotNull(obj.getObjectData());
            assertNotNull(obj.getDirectory());
            assertNotNull(obj.getOLE2ClassName());
        }
    }

    /**
     * Need to recurse into the shapes to find this one
     * See https://github.com/apache/poi/pull/2
     */
    @Test
    void testReadNestedObject() throws IOException {
        try (HSSFWorkbook wb = HSSFTestDataSamples.openSampleWorkbook("WithCheckBoxes.xls")) {
            List<HSSFObjectData> list = wb.getAllEmbeddedObjects();
            assertEquals(list.size(), 1);
            HSSFObjectData obj = list.get(0);
            assertNotNull(obj.getObjectData());
            assertNotNull(obj.getOLE2ClassName());
        }
    }

    /**
     * One with large numbers of recursivly embedded resources
     * See https://github.com/apache/poi/pull/2
     */
    @Test
    void testReadManyNestedObjects() throws IOException {
        try (HSSFWorkbook wb = HSSFTestDataSamples.openSampleWorkbook("45538_form_Header.xls")) {
            List<HSSFObjectData> list = wb.getAllEmbeddedObjects();
            assertEquals(list.size(), 40);
        }
    }
}