Engine database unit test sometimes fail because old data is not dropped

Sometimes the engine database unit tests sometimes fail because the old database schema is not dropped. It seems to be a bug in maven-antrun-plugin because the second execution is not executed.
Maybe upgrade to antrun v1.7?

<id>database</id>

<properties>
<db.properties.file>${user.home}/.camunda/jdbc/engine.${database}.properties</db.properties.file>
</properties>

<activation>
<property>
<name>database</name>
</property>
</activation>
<build>
<plugins>
<plugin>
<artifactId>maven-antrun-plugin</artifactId>
<!--
only worked with this version, there might be a bug with antrun
see http://jira.codehaus.org/browse/MANTRUN-109
-->
<version>1.4</version>
<executions>
<execution>
<id>database-test-create-schema</id>
<phase>process-test-classes</phase>
<goals>
<goal>run</goal>
</goals>
<configuration>
<tasks>
<echo message="updating activiti configuration to db ${database}" />
<copy file="${basedir}/src/test/resources/activiti.cfg.db.xml" tofile="target/test-classes/activiti.cfg.xml" overwrite="true">
<filterset filtersfile="${db.properties.file}" />
</copy>
</tasks>
</configuration>
</execution>
<execution>
<id>database-test-drop-schema</id>
<phase>prepare-package</phase>
<goals>
<goal>run</goal>
</goals>
<configuration>
<tasks>
<echo message="dropping schema in ${database}" />
<java classname="org.camunda.bpm.engine.impl.db.DbSchemaDrop" classpathref="maven.test.classpath" />
</tasks>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
</profile>