List<org.apache.maven.artifact.repository.metadata.Plugin> plugins = pluginGroupMetadata.getPlugins();

                if (plugins != null) {
                    for (org.apache.maven.artifact.repository.metadata.Plugin plugin : plugins) {
                        if (request.getPrefix().equals(plugin.getPrefix())
                                && (candidates.get(pluginGroup) == null

        </executions>
      </plugin>
      <plugin>
        <groupId>org.codehaus.mojo</groupId>
        <artifactId>animal-sniffer-maven-plugin</artifactId>
      </plugin>
      <plugin>
        <artifactId>maven-javadoc-plugin</artifactId>
      </plugin>
      <plugin>
        <artifactId>maven-surefire-plugin</artifactId>
      </plugin>
    </plugins>
  </build>

        </plugin>
        <plugin>
          <groupId>org.apache.maven.plugins</groupId>
          <artifactId>maven-plugin-plugin</artifactId>
          <version>0.1</version>
        </plugin>
        <plugin>
          <groupId>org.apache.maven.plugins</groupId>
          <artifactId>maven-resources-plugin</artifactId>
          <version>0.1</version>
        </plugin>
        <plugin>

        return "src/test/projects/plugin-manager";
    }

    @Test
    void testPluginLoading() throws Exception {
        MavenSession session = createMavenSession(null);
        Plugin plugin = new Plugin();
        plugin.setGroupId("org.apache.maven.its.plugins");
        plugin.setArtifactId("maven-it-plugin");
        plugin.setVersion("0.1");

            plugins.add(newPlugin("maven-deploy-plugin", "deploy"));
        } else {
            plugins = Collections.emptySet();
        }

        return plugins;
    }

    private Plugin newPlugin(String artifactId, String... goals) {
        Plugin plugin = new Plugin();

        plugin.setGroupId("org.apache.maven.plugins");
        plugin.setArtifactId(artifactId);

        for (String goal : goals) {

      <plugin>
        <artifactId>maven-noversion-plugin</artifactId>
      </plugin>
      <plugin>
        <artifactId>maven-from-plugins-plugin</artifactId>
      </plugin>
      <plugin>
        <artifactId>maven-from-pluginManagement-plugin</artifactId>
      </plugin>
    </plugins>
  </reporting>

      </resource>
    </resources>
    <plugins>
      <plugin>
        <groupId>org.mvnsearch</groupId>
        <artifactId>toolchains-maven-plugin</artifactId>
      </plugin>
      <plugin>
        <artifactId>maven-toolchains-plugin</artifactId>
      </plugin>
      <plugin>
        <artifactId>maven-jar-plugin</artifactId>
      </plugin>
      <plugin>
        <extensions>true</extensions>

          </excludes>
        </configuration>
      </plugin>
      <plugin>
        <artifactId>maven-source-plugin</artifactId>
      </plugin>
      <plugin>
        <groupId>org.codehaus.mojo</groupId>
        <artifactId>animal-sniffer-maven-plugin</artifactId>
      </plugin>
      <plugin>
        <extensions>true</extensions>
        <groupId>org.apache.felix</groupId>

 []

 A plugin is described in a {{{../../api/maven-api-plugin/plugin.html}<<<META-INF/maven/plugin.xml>>> plugin descriptor}},
 generally generated from plugin sources using {{{/plugin-tools/maven-plugin-plugin/}maven-plugin-plugin}}.

* See Also

 * {{{/developers/mojo-api-specification.html}Mojo API Specification}}

        descriptor.setVersion("0.1");
        List<String> errors = new ArrayList<>();
        mavenPluginValidator.validate(plugin, descriptor, errors);
        assertFalse(errors.isEmpty(), "Expected collection to not be empty but was empty");
    }

    @Test
    void testInvalidArtifactId() {
        Artifact plugin = new DefaultArtifact(
                "org.apache.maven.its.plugins",
                "maven-it-plugin",