<profiles>
  <profile>
    <id>sonar</id>
    <build>
      <plugins>
        <plugin>
          <groupId>org.apache.maven.plugins</groupId>
          <artifactId>maven-surefire-plugin</artifactId>
          <version>2.12.3</version>
          <configuration>
            <systemPropertyVariables>
              <db.user>foo</db.user>
              <db.password>bar</db.password>
            </systemPropertyVariables>
          </configuration>
        </plugin>
      </plugins>
    </build>
  </profile>
</profiles>