cargo-maven2-plugin を使用してこれを達成できました。
興味のある人のために、ポンポンの関連部分を以下に示します...
...
<groupId>com.test</groupId>
<artifactId>webapp-integration</artifactId>
<packaging>jar</packaging>
<version>1.0-SNAPSHOT</version>
...
<dependencies>
...
<dependency>
<artifactId>webapp1</artifactId>
<groupId>com.test</groupId>
<version>1.0</version>
<type>war</type>
</dependency>
<dependency>
<groupId>webapp2</groupId>
<artifactId>com.test</artifactId>
<version>1.0-SNAPSHOT</version>
<type>war</type>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.codehaus.cargo</groupId>
<artifactId>cargo-maven2-plugin</artifactId>
<version>1.2.2</version>
<configuration>
<container>
<containerId>jetty6x</containerId>
<type>embedded</type>
</container>
<configuration>
<type>standalone</type>
<properties>
<cargo.servlet.port>8085</cargo.servlet.port>
</properties>
<deployables>
<deployable>
<artifactId>webapp1</artifactId>
<groupId>com.test</groupId>
<type>war</type>
<pingURL>http://localhost:8085/testapp/</pingURL>
<properties>
<context>testapp</context>
</properties>
</deployable>
<deployable>
<artifactId>webapp2</artifactId>
<groupId>com.test</groupId>
<type>war</type>
<pingURL>http://localhost:8085/testapp2/</pingURL>
<properties>
<context>testapp2</context>
</properties>
</deployable>
</deployables>
</configuration>
</configuration>
<executions>
<execution>
<id>start-server</id>
<phase>pre-integration-test</phase>
<goals>
<goal>start</goal>
</goals>
</execution>
<execution>
<id>stop-server</id>
<phase>post-integration-test</phase>
<goals>
<goal>stop</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<artifactId>maven-failsafe-plugin</artifactId>
<version>2.12</version>
<dependencies>
<dependency>
<groupId>org.apache.maven.surefire</groupId>
<artifactId>surefire-junit47</artifactId>
<version>2.12</version>
</dependency>
</dependencies>
<configuration>
<groups>com.test.integration.IntegrationTestMarker</groups>
</configuration>
<executions>
<execution>
<goals>
<goal>integration-test</goal>
</goals>
<configuration>
<includes>
<include>**/*.class</include>
</includes>
<skipTests>false</skipTests>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>