<description>
    Test that during inheritance the merging/joining of subtrees with equal identifier doesn't crash if the parent
    POM has a non-empty element and the child POM has an empty element to join.
  </description>

  <properties>
    <prop0>test</prop0>
  </properties>

  <repositories>
    <repository>
      <id>equal-repo-id</id>
      <url>https://maven.apache.org/null</url>
      <snapshots>

            Other values define only the prefix of classes/resources being exposed. Their binary name must be equal to the prefix or starting with the prefix (followed by "." or "$").

  <description>
    Test that during inheritance the merging/joining of subtrees with equal identifier doesn't crash if the parent
    POM has a non-empty element and the child POM has an empty element to join.
  </description>

  <properties/>

  <repositories>
    <repository>
      <id>equal-repo-id</id>
      <url>file:///${basedir}/null</url>
      <snapshots/>
      <releases/>
    </repository>

    /**
     * Returns a collection of {@link ChecksumAlgorithm} in same order as algorithm names are ordered, or throws if
     * any of the algorithm name is not supported. The returned collection has equal count of elements as passed in
     * collection of names, and if names contains duplicated elements, the returned list of algorithms will have
     * duplicates as well.
     *

        <artifactId>b</artifactId>
        <version>0.1</version>
      </extension>
      <extension>
        <!-- project extensions should override inherited extension with equal gid:aid -->
        <groupId>org.apache.maven.its.mng3899</groupId>
        <artifactId>a</artifactId>
        <version>0.2</version>
      </extension>
    </extensions>
    <plugins>
      <plugin>

        return hash;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }

        // make sure IncludesArtifactFilter is not equal ExcludesArtifactFilter!
        if (obj == null || getClass() != obj.getClass()) {
            return false;
        }

        IncludesArtifactFilter other = (IncludesArtifactFilter) obj;

        assertTrue(
                newArtifactVersion(left).compareTo(newArtifactVersion(right)) == 0,
                left + " should be equal to " + right);
        assertTrue(
                newArtifactVersion(right).compareTo(newArtifactVersion(left)) == 0,
                right + " should be equal to " + left);
    }

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Builds the full lifecycle in weave-mode (phase by phase as opposed to project-by-project).
 * <p>
 * This builder uses a number of threads equal to the minimum of the degree of concurrency (which is the thread count
 * set with <code>-T</code> on the command-line) and the number of projects to build. As such, building a single project