* Aliases map Maven 3 phase names to their Maven 4 equivalents.
     *
     * @return the collection of phase aliases
     */
    Collection<Alias> aliases();

    /**
     * A phase in the lifecycle.
     *
     * A phase is identified by its name. It also contains a list of plugins bound to that phase,
     * a list of {@link Link links}, and a list of sub-phases.  This forms a tree of phases.
     */

        <plugin>
          <groupId>build</groupId>
          <artifactId>managed-plugin</artifactId>
          <executions>
            <execution>
              <phase>test</phase>
            </execution>
            <execution>
              <phase>test</phase>
            </execution>
          </executions>
        </plugin>
      </plugins>
    </pluginManagement>
    <plugins>
      <plugin>

@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.TYPE)
@Inherited
public @interface Execute {
    /**
     * Lifecycle phase to fork. Note that specifying a phase overrides specifying a goal.
     * @return the phase
     */
    @Nonnull
    String phase() default "";

    /**
     * Goal to fork. Note that specifying a phase overrides specifying a goal. The specified <code>goal</code> must be
     * another goal of the same plugin.

        return getExecutionPlanItems().iterator();
    }

    /**
     * Returns the last ExecutionPlanItem in the supplied phase. If no items are in the specified phase,
     * the closest executionPlanItem from an earlier phase item will be returned.
     *
     * @param requestedPhase the requested phase
     *                       The execution plan item
     * @return The ExecutionPlanItem or null if none can be found
     */

        <executions>
          <execution>
            <id>create-distro-packages</id>
            <goals>
              <goal>single</goal>
            </goals>
            <phase>package</phase>
            <configuration>
              <descriptors>
                <descriptor>src/assembly/bin.xml</descriptor>
              </descriptors>
            </configuration>
          </execution>

        }.writePlan(System.out::println, plan);

        plan.allSteps().forEach(phase -> {
            phase.predecessors.forEach(
                    pred -> assertTrue(plan.step(pred.project, pred.name).isPresent(), "Phase not present: " + pred));
        });
    }

    @Test
    void testAlias() {
        MavenProject p1 = new MavenProject();

          <version>1.0.0+</version>
          <description>The phase mappings for this lifecycle.</description>
          <association>
            <type>Phase</type>
            <multiplicity>*</multiplicity>
          </association>
        </field>
      </fields>
    </class>
    <class>
      <name>Phase</name>
      <version>1.0.0+</version>
      <description>A phase mapping definition.</description>
      <fields>

            Element executions = cleanPlugin.child("executions").orElse(null);
            Element execution = executions.child("execution").orElse(null);
            Element phase = execution.child("phase").orElse(null);

            assertEquals("pre-clean", phase.textContent(), "Phase should remain as pre-clean for 4.0.0");
        }

        @Test
        @DisplayName("should preserve non-deprecated phases")

        this.defaultPhases = getDefaultPhases(lifecycle);
    }

    // <lifecycle>
    //   <id>clean</id>
    //   <phases>
    //     <phase>pre-clean</phase>
    //     <phase>clean</phase>
    //     <phase>post-clean</phase>
    //   </phases>
    //   <default-phases>
    //     <clean>org.apache.maven.plugins:maven-clean-plugin:clean</clean>
    //   </default-phases>
    // </lifecycle>

                    String phase = goalsForLifecyclePhase.getKey();
                    LifecyclePhase goals = goalsForLifecyclePhase.getValue();
                    if (goals != null) {
                        parseLifecyclePhaseDefinitions(plugins, phase, goals);
                    }
                }
            }
        }