include test package

<plugin>
  <groupId>org.apache.maven.plugins</groupId>
  <artifactId>maven-shade-plugin</artifactId>
  <version>1.2.2</version>
  <executions>
    <execution>
      <phase>package</phase>
      <goals>
        <goal>shade</goal>
      </goals>
      <configuration>
        <artifactSet>
          <includes>
            <include>org.apache.maven:*</include>
          </includes>
        </artifactSet>
      </configuration>
    </execution>
  </executions>
</plugin>