// ----------------------------------------------------------------------

        List<PluginExecution> executions = plugin.getExecutions();

        PluginExecution execution = executions.get(0);

        String g0 = execution.getGoals().get(0);

        assertEquals("plexus:runtime", g0);

        configuration = execution.getDelegate().getConfiguration();

        assertEquals(

<plugins>
  <plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-resources-plugin</artifactId>
    <executions>
      <execution>
        <goals>
          <goal>process</goal>
        </goals>
      </execution>
    </executions>
  </plugin>
  .
  .
  .
</plugins>

import org.apache.maven.project.MavenProject;

/**
 */
public class MojoExecutorStub extends MojoExecutor { // This is being lazy instead of making interface

    protected final List<MojoExecution> executions = Collections.synchronizedList(new ArrayList<>());

    public MojoExecutorStub() {
        super(null, null, null, null, null, null);
    }

    public MojoExecutorStub(

          <velocityBasedir>${project.basedir}/../../src/mdo</velocityBasedir>
        </configuration>
        <executions>
          <execution>
            <id>modello</id>
            <goals>
              <goal>velocity</goal>
            </goals>
          </execution>
        </executions>
      </plugin>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>

            <version>${maven-gpg-plugin.version}</version>
            <executions>
              <execution>
                <id>sign-artifacts</id>
                <phase>verify</phase>
                <goals>
                  <goal>sign</goal>
                </goals>
              </execution>
            </executions>
          </plugin>
        </plugins>
      </build>
    </profile>

        </configuration>
        <executions>
          <execution>
            <id>modello</id>
            <goals>
              <goal>velocity</goal>
              <goal>xdoc</goal>
              <goal>xsd</goal>
            </goals>
            <phase>generate-sources</phase>
          </execution>
        </executions>
      </plugin>
    </plugins>
  </build>

        return null;
    }

    private PluginExecution findPluginExecution(String executionId, Collection<PluginExecution> executions) {
        if (executionId != null && !executionId.isEmpty()) {
            for (PluginExecution execution : executions) {
                if (executionId.equals(execution.getId())) {
                    return execution;
                }
            }
        }

        return null;
    }

          <velocityBasedir>${project.basedir}/../../src/mdo</velocityBasedir>
          <models>
            <model>src/main/mdo/toolchains.mdo</model>
          </models>
        </configuration>
        <executions>
          <execution>
            <id>velocity</id>
            <goals>
              <goal>velocity</goal>
            </goals>
            <phase>generate-sources</phase>
            <configuration>

          </params>
          <velocityBasedir>${project.basedir}/../../src/mdo</velocityBasedir>
        </configuration>
        <executions>
          <execution>
            <id>modello-v3</id>
            <goals>
              <goal>velocity</goal>
            </goals>
            <configuration>
              <version>1.1.0</version>
              <models>

/**
 * Handles expansion of general build plugin configuration into individual executions.
 *
 * @deprecated use {@code org.apache.maven.api.services.ModelBuilder} instead
 */
@Deprecated(since = "4.0.0")
public interface PluginConfigurationExpander {

    /**
     * Merges values from general build plugin configuration into the individual plugin executions of the given model.
     *