src/test/settings-profile-file.xml

<?xml version="1.0"?>

<settings xmlns="http://maven.apache.org/SETTINGS/1.0.0"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0 http://maven.apache.org/xsd/settings-1.0.0.xsd">
  <profiles>
    <profile>
      <id>test-repo</id>
      <activation>
        <file><exists>./pom.xml</exists></file>
      </activation>
      <repositories>
        <repository>
          <id>test.repo</id>
          <url>file:./src/test/repo</url>
          <snapshots>
            <enabled>false</enabled>
          </snapshots>
          <releases>
            <enabled>true</enabled>
          </releases>
        </repository>
      </repositories>
    </profile>
  </profiles>
</settings>