Add test case for PublishFeaturesAndBundlesMojo marking bundle unpacked

The PublishFeaturesAndBundlesMojo produces a p2 repository in which
plugins are marked as "zipped" and will thus be unpacked upon
installation when a feature including them does not include the plugin
with "unpack=false". The added test demonstrates this behavior and
ensures that only the feature will properly be marked as "zipped" but
not the included plugin.

(cherry picked from commit d23230d)

tycho-its/projects/p2extra/publisherNoUnpack/pom.xml

@@ -0,0 +1,38 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+
+	<groupId>tycho-its-project.p2extra.publisherNoUnpack</groupId>
+	<artifactId>parent</artifactId>
+	<version>1.0.0-SNAPSHOT</version>
+	<packaging>pom</packaging>
+
+	<build>
+		<plugins>
+			<!-- Configuration for the PublishFeaturesAndBundlesMojoTest -->
+			<plugin>
+				<groupId>org.eclipse.tycho.extras</groupId>
+				<artifactId>tycho-p2-extras-plugin</artifactId>
+				<version>${tycho-version}</version>
+				<executions>
+					<execution>
+						<phase>prepare-package</phase>
+						<goals>
+							<goal>publish-features-and-bundles</goal>
+						</goals>
+					</execution>
+				</executions>
+				<configuration>
+					<sourceLocation>.</sourceLocation>
+					<artifactRepositoryLocation>target/repository</artifactRepositoryLocation>
+					<metadataRepositoryLocation>target/repository</metadataRepositoryLocation>
+					<publishArtifacts>true</publishArtifacts>
+					<compress>false</compress>
+				</configuration>
+			</plugin>
+		</plugins>
+	</build>
+
+</project>

tycho-its/src/test/java/org/eclipse/tycho/test/P2ExtrasPlugin.java

@@ -12,14 +12,25 @@
  *******************************************************************************/
 package org.eclipse.tycho.test;
 
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
 import java.io.File;
+import java.io.IOException;
+import java.nio.file.Path;
 import java.util.ArrayList;
 import java.util.List;
+import java.util.Optional;
 
 import org.apache.maven.it.VerificationException;
 import org.apache.maven.it.Verifier;
 import org.junit.Test;
 
+import de.pdark.decentxml.Document;
+import de.pdark.decentxml.Element;
+import de.pdark.decentxml.XMLIOSource;
+import de.pdark.decentxml.XMLParser;
+
 public class P2ExtrasPlugin extends AbstractTychoIntegrationTest {
 
 	@Test
@@ -129,4 +140,38 @@ private void execute(Verifier verifier, boolean success, String project, String
 		}
 	}
 
+	@Test
+	public void testPublishFeaturesAndBundles_noUnpack() throws Exception {
+		final String pluginId = "test_plugin";
+		final String featureId = "test_feature.feature.jar";
+
+		Verifier verifier = getVerifier("p2extra/publisherNoUnpack", false, true);
+		verifier.executeGoals(List.of("clean", "package"));
+
+		Path contentXml = Path.of(verifier.getBasedir()).resolve("target/repository").resolve("content.xml");
+		Element pluginUnitInContentXml = extractUnitFromContentXml(contentXml, pluginId);
+		assertFalse("test plugin should not be marked as zipped", hasChildWithZippedAttribute(pluginUnitInContentXml));
+		Element featureUnitInContentXml = extractUnitFromContentXml(contentXml, featureId);
+		assertTrue("test feature should be marked as zipped", hasChildWithZippedAttribute(featureUnitInContentXml));
+	}
+
+	private static Element extractUnitFromContentXml(Path contentXml, String unitName) throws IOException {
+		XMLParser parser = new XMLParser();
+		Document document = parser.parse(new XMLIOSource(contentXml.toFile()));
+		Element unitElement = document.getChild("repository/units");
+		List<Element> units = unitElement.getChildren("unit");
+		Optional<Element> extractedUnit = units.stream()
+				.filter(element -> unitName.equals(element.getAttribute("id").getValue())).findFirst();
+		assertTrue(String.format("Unit with name '%s' not found in content.xml with units: %s", unitName, units),
+				extractedUnit.isPresent());
+		return extractedUnit.get();
+	}
+
+	private static boolean hasChildWithZippedAttribute(Element element) {
+		if ("zipped".equals(element.getAttributeValue("key"))) {
+			return true;
+		}
+		return element.getChildren().stream().anyMatch(P2ExtrasPlugin::hasChildWithZippedAttribute);
+	}
+
 }