src/it/projects/unpack-custom-ear/pom.xml

<?xml version="1.0" encoding="UTF-8"?>

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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">

  <modelVersion>4.0.0</modelVersion>

  <groupId>org.apache.maven.its.dependency</groupId>
  <artifactId>mdep-300</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>custom-ear</packaging>

  <description>
    Test dependency:unpack with custom packaging type
  </description>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  </properties>

  <build>
    <!--
    <extensions>
      <extension>
        <groupId>org.apache.maven.plugins.dependency.its</groupId>
        <artifactId>maven-custom-ear-manager</artifactId>
        <version>1.0</version>
      </extension>
    </extensions>
     -->
    <plugins>
      <plugin>
        <extensions>true</extensions>
        <groupId>org.apache.maven.plugins.dependency.its</groupId>
        <artifactId>maven-custom-ear-plugin</artifactId>
        <version>1.0</version>
      </plugin>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-dependency-plugin</artifactId>
        <version>@project.version@</version>
        <executions>
          <execution>
            <id>unpack</id>
            <goals>
              <goal>unpack</goal>
            </goals>
            <phase>integration-test</phase>
            <configuration>
              <artifactItems>
                <artifactItem>
                  <groupId>${project.groupId}</groupId>
                  <artifactId>${project.artifactId}</artifactId>
                  <version>${project.version}</version>
                  <type>${project.packaging}</type>
                </artifactItem>
              </artifactItems>
            </configuration>
          </execution>
        </executions>
        <dependencies>
          <dependency>
            <groupId>org.apache.maven.plugins.dependency.its</groupId>
            <artifactId>maven-custom-ear-manager</artifactId>
            <version>1.0</version>
          </dependency>
        </dependencies>
      </plugin>
    </plugins>
  </build>
</project>