<?xml version="1.0" encoding="UTF-8"?>
<metadata>
  <groupId>org.apache.maven.its</groupId>
  <artifactId>a</artifactId>
  <version>0.1</version>
  <versioning>
    <versions>
      <version>0.1</version>
    </versions>
    <lastUpdated>20091023222756</lastUpdated>
  </versioning>

    private String createPluginKey(Element plugin) {
        String groupId = plugin.childText(MavenPomElements.Elements.GROUP_ID);
        String artifactId = plugin.childText(MavenPomElements.Elements.ARTIFACT_ID);

        // Default groupId for Maven plugins
        if (groupId == null && artifactId != null && artifactId.startsWith(MAVEN_PLUGIN_PREFIX)) {
            groupId = DEFAULT_MAVEN_PLUGIN_GROUP_ID;
        }

        StringBuilder buffer = new StringBuilder(256);

        buffer.append(LS).append("Repository Metadata").append(LS).append("--------------------------");
        buffer.append(LS).append("GroupId: ").append(getGroupId());
        buffer.append(LS).append("ArtifactId: ").append(getArtifactId());
        buffer.append(LS).append("Metadata Type: ").append(getClass().getName());

        return buffer.toString();

    }

    @Test
    void testMissingGroupId() throws Exception {
        SimpleProblemCollector result = validate("missing-groupId-pom.xml");

        assertViolations(result, 0, 1, 0);

        assertEquals("'groupId' is missing.", result.getErrors().get(0));
    }

    @Test
    void testInvalidCoordinateIds() throws Exception {

    @Override
    public Artifact createArtifact(String groupId, String artifactId, String version, String scope, String type) {
        return artifactFactory.createArtifact(groupId, artifactId, version, scope, type);
    }

    @Override
    public Artifact createArtifact(String groupId, String artifactId, String version, String packaging) {
        return artifactFactory.createBuildArtifact(groupId, artifactId, version, packaging);
    }

<project>
  <modelVersion>4.0.0</modelVersion>
  <groupId>maven-test</groupId>
  <artifactId>t05-d</artifactId>
  <packaging>jar</packaging>
  <version>1.1</version>

<project>
  <modelVersion>4.0.0</modelVersion>
  <groupId>maven-test</groupId>
  <artifactId>t07-d</artifactId>
  <packaging>jar</packaging>
  <version>1.0</version>

<project>
  <modelVersion>4.0.0</modelVersion>
  <groupId>maven-test</groupId>
  <artifactId>t08-d</artifactId>
  <packaging>jar</packaging>
  <version>1.1</version>

    }

    private static Predicate<Artifact> toPredicate(Exclusion exclusion) {
        PathMatcher groupId = FileSystems.getDefault().getPathMatcher("glob:" + exclusion.getGroupId());
        PathMatcher artifactId = FileSystems.getDefault().getPathMatcher("glob:" + exclusion.getArtifactId());
        Predicate<Artifact> predGroupId = a -> groupId.matches(createPathProxy(a.getGroupId()));

            String firstToken = tok[0];
            // groupId or pluginPrefix? heuristics: groupId contains dot (.) but not pluginPrefix
            if (firstToken.contains(".")) {
                // We have everything that we need except the version
                //
                // org.apache.maven.plugins:maven-remote-resources-plugin:???:process
                //
                // groupId
                // artifactId