</field>
        <field>
          <name>phases</name>
          <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>

        this.id = lifecycle.id();
        this.phases = registry.computePhases(lifecycle);
        this.defaultPhases = getDefaultPhases(lifecycle);
    }

    // <lifecycle>
    //   <id>clean</id>
    //   <phases>
    //     <phase>pre-clean</phase>
    //     <phase>clean</phase>
    //     <phase>post-clean</phase>
    //   </phases>
    //   <default-phases>

    }

    @Test
    void testSet() {
        LifecyclePhase phase = new LifecyclePhase();
        assertNull(phase.getMojos());

        phase.set("");
        assertNotNull(phase.getMojos());
        assertEquals(0, phase.getMojos().size());

        phase.set("jar:jar, war:war");

        List<LifecycleMojo> mojos = phase.getMojos();
        assertNotNull(mojos);

        phaseUpgrades.put("pre-clean", Lifecycle.BEFORE + Lifecycle.Phase.CLEAN);
        phaseUpgrades.put("post-clean", Lifecycle.AFTER + Lifecycle.Phase.CLEAN);

        // Default lifecycle aliases
        phaseUpgrades.put("pre-integration-test", Lifecycle.BEFORE + Lifecycle.Phase.INTEGRATION_TEST);
        phaseUpgrades.put("post-integration-test", Lifecycle.AFTER + Lifecycle.Phase.INTEGRATION_TEST);

        // Site lifecycle aliases

        <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>

        PhaseId p1 = PhaseId.of(o1);
        PhaseId p2 = PhaseId.of(o2);
        int i1 = lifecyclePhases.indexOf(p1.executionPoint().prefix() + p1.phase());
        int i2 = lifecyclePhases.indexOf(p2.executionPoint().prefix() + p2.phase());
        if (i1 == -1 && i2 == -1) {
            // unknown phases, leave in existing order
            return 0;
        }
        if (i1 == -1) {
            // second one is known, so it comes first

    private final String phase;

    /**
     * The priority of this dynamic phase within the static phase.
     */
    private final int priority;

    /**
     * Parses the phase identifier.
     *
     * @param phase the phase identifier.
     * @return the {@link PhaseId}.
     */
    public static synchronized PhaseId of(String phase) {
        return INSTANCES.computeIfAbsent(phase, PhaseId::new);
    }

    /**

        }

        for (Phase phase : lifecycleOverlay.getPhases()) {
            String phaseId = defaultLifecycles.getLifeCycles().stream()
                    .flatMap(l -> l.getDelegate().aliases().stream())
                    .filter(a -> phase.getId().equals(a.v3Phase()))
                    .findFirst()
                    .map(a -> a.v4Phase())
                    .orElse(phase.getId());

        <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();