Java object diff testing with List<String> changes

DiffTesting.java

import java.util.ArrayList;
import java.util.List;

import org.javers.core.Javers;
import org.javers.core.JaversBuilder;
import org.javers.core.MappingStyle;
import org.javers.core.changelog.SimpleTextChangeLog;
import org.javers.core.diff.Change;
import org.javers.core.metamodel.clazz.EntityDefinition;
import org.javers.core.metamodel.object.InstanceIdDTO;
import org.junit.Test;

import de.danielbechler.diff.ObjectDifferBuilder;
import de.danielbechler.diff.node.DiffNode;
import de.danielbechler.diff.node.DiffNode.Visitor;
import de.danielbechler.diff.node.Visit;

public class DiffTesting {

    private class TestObject {

        private Integer _id;
        private String _name;
        private List<String> _table;

        TestObject(Integer id) {
            _id = id;
        }

        public Integer getId() {
            return _id;
        }

        public void setId(Integer id) {
            _id = id;
        }

        public String getName() {
            return _name;
        }

        public void setName(String name) {
            _name = name;
        }

        public List<String> getTable() {
            return _table;
        }

        public void setTable(List<String> table) {
            _table = table;
        }
    }

    /**
     * Return a test object filled with table rows
     * @return
     */
    private TestObject getTestData() {
        TestObject obj = new TestObject(1);
        obj.setName("List example");

        // fill table with 100 rows of test data
        List<String> rows = new ArrayList<>();
        for (int i = 0; i < 100; i++)
            rows.add("A" + i);
        obj.setTable(rows);

        return obj;
    }

    @Test
    public void testJavers() {
        Javers javers = JaversBuilder.javers()
                .withMappingStyle(MappingStyle.FIELD)
                .registerEntity(new EntityDefinition(TestObject.class, "_id"))
                .build();

        TestObject base = getTestData();
        javers.commit("[email protected]", base);

        // delete the 5th row
        base.getTable().remove(5);

        // insert 2 rows at position 90
        base.getTable().add(90, "INSERT_A1");
        base.getTable().add(91, "INSERT_A2");

        javers.commit("[email protected]", base);

        // list out changes
        List<Change> changes = javers.getChangeHistory(InstanceIdDTO.instanceId(1, TestObject.class), 5);

        SimpleTextChangeLog log = new SimpleTextChangeLog();
        javers.processChangeList(changes, log);
        System.out.println(log.result());
    }

    @Test
    public void testJavaObjectDiff() {
        final TestObject base = getTestData();

        // delete delete the 5th row and insert 2 rows at position 90
        final TestObject working = getTestData();
        working.getTable().remove(5);
        working.getTable().add(90, "INSERT_A1");
        working.getTable().add(91, "INSERT_A2");


        DiffNode diff = ObjectDifferBuilder.buildDefault().compare(working, base);
        diff.visit(new Visitor() {
            @Override
            public void node(DiffNode node, Visit visit) {
                Object baseValue = node.canonicalGet(base);
                Object workingValue = node.canonicalGet(working);
                String message = node.getPath() + " changed from " + baseValue + " to " + workingValue;
                System.out.println(message);
            }
        });
    }

}