import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.StreamSupport;

import org.w3c.dom.Node;
import org.xmlunit.builder.DiffBuilder;
import org.xmlunit.builder.Input;
import org.xmlunit.diff.Diff;

import org.junit.Test;

import static org.junit.Assert.assertEquals;

public class XmlUnitTest {

	@Test
	public void testForDifferences() {
		String control = "<Parent>\n" +
			"    <Costum>\n" +
			"        <Work>\n" +
			"            <Person>\n" +
			"                <FirstName>John</FirstName>\n" +
			"                <LastName>Doe</LastName>\n" +
			"                <Email>johndoe@email.com</Email>\n" +
			"            </Person>\n" +
			"            <Person>\n" +
			"                <FirstName>Mickey</FirstName>\n" +
			"                <LastName>Mouse</LastName>\n" +
			"                <Email>mm@email.com</Email>\n" +
			"            </Person>\n" +
			"            <Person>\n" +
			"                <FirstName>HO</FirstName>\n" +
			"                <LastName>FRT</LastName>\n" +
			"                <Email>mm@email.com</Email>\n" +
			"            </Person>\n" +
			"        </Work>\n" +
			"    </Costum>\n" +
			"</Parent>";
		String test = "<Parent>\n" +
			"    <Costum>\n" +
			"        <Work>\n" +
			"            <Person>\n" +
			"                <FirstName>John</FirstName>\n" +
			"                <LastName>Doe</LastName>\n" +
			"                <Email>johndoe@email.com</Email>\n" +
			"            </Person>\n" +

			"            <Person>\n" +
			"                <FirstName>HO</FirstName>\n" +
			"                <LastName>FRT</LastName>\n" +
			"                <Email>mm@email.com</Email>\n" +
			"            </Person>\n" +
			"            <Person>\n" +
			"                <FirstName>Mickey</FirstName>\n" +
			"                <LastName>Mouse</LastName>\n" +
			"                <Email>mm@email.com</Email>\n" +
			"            </Person>\n" +
			"        </Work>\n" +
			"    </Costum>\n" +
			"</Parent>";

		Diff myDiff = DiffBuilder.compare(Input.fromString(control))
			.withTest(Input.fromString(test))
			.ignoreWhitespace()
			.checkForSimilar()
			.build();

		List<String> controlElements = StreamSupport
			.stream(myDiff.getDifferences().spliterator(), false /* parallel */)
			.map(diff -> diff.getComparison().getControlDetails().getTarget())
			.map(node -> describeElement(node))
			.sorted()
			.collect(Collectors.toList());

		List<String> testElements = StreamSupport
			.stream(myDiff.getDifferences().spliterator(), false /* parallel */)
			.map(diff -> diff.getComparison().getTestDetails().getTarget())
			.map(node -> describeElement(node))
			.sorted()
			.collect(Collectors.toList());

		assertEquals("В документе есть различия", controlElements, testElements);
	}

	private static String describeElement(Node node) {
		String value = node.getNodeValue();
		String name = node.getParentNode().getLocalName();
		String parentName = node.getParentNode().getParentNode().getLocalName();

		return new StringBuilder()
			.append(parentName)
			.append('/')
			.append(name)
			.append('/')
			.append(value)
			.toString();

	}