core-it-suite/src/test/resources/mng-4023/pom.xml

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

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<project>
  <modelVersion>4.0.0</modelVersion>

  <groupId>org.apache.maven.its.mng4023</groupId>
  <artifactId>parent</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>pom</packaging>

  <name>Maven Integration Test :: MNG-4023</name>
  <description>
    Verify that profiles in a parent are only injected once during a reactor build that include the parent
    itself. The parent being part of the reactor makes it subject to project caching and proper use of the
    cache is crucial here.
  </description>

  <modules>
    <module>sub</module>
  </modules>

  <profiles>
    <profile>
      <id>maven-core-it</id>
      <activation>
        <activeByDefault>true</activeByDefault>
      </activation>
      <build>
        <plugins>
          <plugin>
            <groupId>org.apache.maven.its.plugins</groupId>
            <artifactId>maven-it-plugin-configuration</artifactId>
            <version>2.1-SNAPSHOT</version>
            <configuration>
              <propertiesFile>target/config.properties</propertiesFile>
              <!--
              NOTE: combine.children="append" is the essential point here, i.e. the profile injection has additive
              effects on the model and as such must not happen multiple times.
              -->
              <stringParams combine.children="append">
                <stringParam>test</stringParam>
              </stringParams>
            </configuration>
          </plugin>
        </plugins>
      </build>
    </profile>
  </profiles>
</project>