}
    }

    private void addPlugin(Map<Plugin, Plugin> plugins, Plugin plugin) {
        Plugin cur = plugins.putIfAbsent(plugin, plugin);
        if (cur != null) {
            Map<String, PluginExecution> execs = new LinkedHashMap<>();
            cur.getExecutions().forEach(e -> execs.put(e.getId(), e));
            plugin.getExecutions().forEach(e -> {
                int i = 0;

        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");

     *
     * @param plugin The plugin whose descriptor should be retrieved, must not be {@code null}.
     * @param repositories The plugin repositories to use for resolving the plugin's main artifact, must not be {@code
     *            null}.
     * @param session The repository session to use for resolving the plugin's main artifact, must not be {@code null}.

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

      </plugin>
      <plugin>
        <groupId>org.apache.maven.its.plugins</groupId>
        <artifactId>maven-it-plugin-dependency-resolution</artifactId>
        <version>2.1-SNAPSHOT</version>
      </plugin>
      <plugin>
        <groupId>org.apache.maven.its.plugins</groupId>
        <artifactId>maven-it-plugin-packaging</artifactId>
        <version>2.1-SNAPSHOT</version>
      </plugin>
      <plugin>

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

        return plugins;
    }

            plugins = new LinkedHashSet<>();

            plugins.add(newPlugin("maven-compiler-plugin", "compile", "testCompile"));
            plugins.add(newPlugin("maven-resources-plugin", "resources", "testResources"));
            plugins.add(newPlugin("maven-surefire-plugin", "test"));
            plugins.add(newPlugin("maven-jar-plugin", "jar"));
            plugins.add(newPlugin("maven-install-plugin", "install"));

            plugins = new LinkedHashSet<>();

            plugins.add(newPlugin("maven-compiler-plugin", "compile", "testCompile"));
            plugins.add(newPlugin("maven-resources-plugin", "resources", "testResources"));
            plugins.add(newPlugin("maven-surefire-plugin", "test"));
            plugins.add(newPlugin("maven-jar-plugin", "jar"));
            plugins.add(newPlugin("maven-install-plugin", "install"));

  <name>Maven Integration Test :: MNG-3827</name>
  <description>
    Verify that plain plugin configuration works correctly.
  </description>

  <build>
    <!-- This project does not use plugin management for the test plugin -->
    <plugins>
      <plugin>
        <groupId>org.apache.maven.its.plugins</groupId>
        <artifactId>maven-it-plugin-configuration</artifactId>
        <version>1.0</version>
        <configuration>

     1. plugin goal execution in a child is usually simply appended (at end): you can't try to insert in the middle of pre-existing inherited executions,

     2. append happens at plugin level first, then goal level, independently from phases.
        This means for example that adding pluginA:goal2 to pre-existing (pluginA:goal1, pluginB:goal) will lead to (pluginA:goal1, pluginA:goal2, pluginB:goal)